# Questions Asked onOctober 17, 2010

1. ## Physics

A spring-loaded toy gun is used to shoot a ball of mass m=1.5 kg straight up in the air. The spring has spring constant k=667 N/m. If the spring is compressed a distance of 25.0 centimeters from its equilibrium position and then released, the ball reaches

2. ## trig

prove that cos 52 + cos 68 + cos172 = 0

Styrene, C8H8, is one of the substances used in the production of synthetic rubber. When styrene burns in oxygen to form carbon dioxide and liquid water under standard-state conditions at 25°C, 42.62 kJ are released per gram of styrene. Find the standard

4. ## Chem

I stuck on this problem. Can you help me to solve it? A reaction mixture in a 3.67L flask at a certain temp. initially contains 0.763g H2 and 96.9g I2. At equilibrium, the flask contains 90.4g HI. Calculate the equilibrium constant(Kc) for the reaction at

the enthalpy change when a strong acid is neutralized by base is -56.1 kJ/mol. If 135 ml of .450 M HI at 23.15 C is mixed with 145 of .500 M NaOH at 23.15 C What will the max temperature reached by the resulting solution? tamana: Assume the specific heat

6. ## CHEM

is breaking an egg a chemical or physical change? is cooking an egg a chemical or physical change?

7. ## Physics

How much work is required to stop an electron (m= 9.11 * 10^-31 kg) which is moving with a speed of 1.80×10^6 m/s?

8. ## math

A tree casts a shadow that is 20 feet long. The angle of elevation from the end of the shadow to the top of tree is 66 degrees. Determine the height of the tree, to the nearest foot.

9. ## Algebra

You have 600 feet of fencing to enclose a rectangular plot that borders on a river. If you do not fence the side along the river, find the length and width of the plot that will maximize the area. What is the largest area that can be enclosed?

10. ## general chemistry

A student needs to determine by titration with NaOH the precise %KHP in an unknown sample that is thought to contain approximately 50%KHP. Approximately what mass of sample should the student use in order to use about 20mL of 0.1005 M NaOH to reach the

a tree casts a shadow that is 20 feet long. the angle of elevation from the end of the shadow to the top of the tree is 66 degrees. Determine the height of the tree to the nearest foot.

12. ## physics

A motorcycle stunt rider must jump a 100m wide canyon given a 20° ramp positioned on either side. What minimum speed is required so the rider will clear the canyon?

13. ## Chem

The relationship between volume and pressure (at constant temperature) is directly proportional. my answer- True The relationship between pressure and temperature (at constant volume) is inversely proportional. my answer- True The relationship between

14. ## CHEMISTRY FORMULA

How would you write the chemical formula for Mercury(I) nitrate. i have Hg(NO3)2 since the charge of nitrate is -2 and Mercury's is 1. However, upon checking online i found that the correct formula is Hg2(No3)2. I don't understand where the subscript 2 of

15. ## Organic Chemistry - Melting Point

You have an unknown with an observed melting point of 90-93°C. Is your unknown compound A with a reported melting point of 95.5-96°C or compound B with a reported melting point of 90.5-91°C? Explain.

16. ## entrepreneurship

1- Which entrepreneurial/small business owner characteristics does Bill have that may be important to his success? Which characteristics could lead to his failure? 2- What steps should Bill take to avoid the pitfalls common to a small business?

17. ## Physics

6 J of work is needed to push an object of mass 2 kg from point A to point B of the frictionless inclined plane. If the angle of inclination is 30°, the height of the plane is h, what is the length s of the inclined plane?

18. ## physics

in what direction should a force be applied to produce maximum torque.?

19. ## geometry

Find the values of x and y that make the quadrilateral a parallelogram. Show all your work. a parallelogram is drawn with opposite sides of 4 times y minus 1 and 2 times y plus 7. The second set is 3 times x plus 1 and 4 times x minus 2

20. ## Microeconomics

Combination Health Care All Other Goods A 0 100 B 25 90 C 50 70 D 75 40 E 100 0 b. What is the opportunity cost of combination C? c. Suppose a second nation has the following data. Plot the PPC, and then determine which nation has the comparative advantage

21. ## Physics

Please Help!!!: How many seconds will it take a 12hp motor to lift a 1500lb elevator at a distance of 9ft? what was the average velocity of the elevator?

22. ## science

How much heat is absorbed by a persons hand if 100 grams of steam at 100c is first converted to liquid at 100c and then cooled to normal body temperature?

23. ## calculus

A hot air balloon rising straight up form a level field is tracked by a range finder 500ft from the liftoff point. At the moment the range finders elevation ange is pi/4, the angle is increasing at 0.14 rad/min. How fast is the balloon rising at that

24. ## Chemistry

100g of a clear liquid is evaporated and a few grams of white crystals remain. The original liquid wasa a) heterogeneous compound b) heterogeneous mixture c) homogeneous compound d) homogeneous mixture

25. ## AP Chemistry Born-Haber Cycle?

When using the Born-Haber Cycle for Na2S, do I double the ionization energy of Na since there are two Na ions for every S ion in Na2S? Also, the problem asked me to find the change in energy for S- (g) + e- => S2- (g). Assuming that you do double the

26. ## English

Please answer each of the following questions in paragraph form. You should write one short paragraph for each response. Be sure to fully explain your answers using support from the text. 1. What do you think has happened to the narrator to make him feel

27. ## math

A tree casts a shadow that is 20 feet long. The angle of elevation from the end of the shadow to the top of tree is 66 degrees. Determine the height of the tree, to the nearest foot.

28. ## math

Three numbers between 70 and 80 are prime numbers.what numbers are they? Explain how you know they are prime numbers.

29. ## statitics

Find the mean and standard deviation for a binomial distribution with these values: a. n = 1000, p = 0.3 b. n = 400, p = 0.01 c. n = 500, p = 0.5

30. ## Physics

In the rope climb, a 68 athlete climbs a vertical distance of 9.0 in 13 . What minimum power output was used to accomplish this feat? In Watts

A 4.3 kg bucket of water is raised from a well by a rope. The acceleration of gravity is 9.8 m/s2 . If the upward acceleration of the bucket is 4.6 m/s2, find the force exerted by the rope on the bucket. Answer in units of N. I'm almost sure the answer

32. ## Chemistry

If 5.86g of glucose are reacted and 1.44L of CO2 gas are collected at 293K and .984atm. What is the percent yield of the reaction? C6H1206 -> 2C2H5OH + 2CO2

33. ## math

Suppose the yearly rainfall totals for a some city follow a normal distribution, with mean of 18 inches and standard deviation of 6 inches. For a randomly selected year, what is the probability, P, that total rainfall will be in each of the following

34. ## math

CALCULATE THE UNIT COST OF \$1.85 FOR 4 KG

35. ## art

Looking on the national gallery of art website (or it can be seen by typing the name of the painting in any search box) review The Emperor Napoleon in His Study at the Tuileries by Jacques Louis David.Discuss the painting techniques and formal elements. I

36. ## computer science

What is the binary representation of the following hexadecimal number? What are the decimal numbers they represent when interpreted as undesigned integers. (a) F4 (b) 9F

37. ## college Algebra

This is my problem: A carpenter is building a rectangular room with a fixed perimeter of 336 ft. What dimensions would yield the maximum area? What is the maximum area? I am confused on what steps it takes to come up with the answer. I would like an

38. ## Chemical Formula

How would you write the chemical formula for Mercury(I) nitrate. I have Hg(NO3)2 since the charge of nitrate is -1 and Mercury's is 1. However, upon checking online i found that the correct formula is Hg2(No3)2. Given that the charge for mercury in this

39. ## calculus

Find the equation of a cubic function that gives you the surface area of the cans given a set volume. The set volume is 300ml

40. ## Chemistry

What is the balanced equation for the reaction of 3.000 g of K2CO3 and HCl?

41. ## Chemistry

The following reaction represents the decomposition of hydrogen peroxide: 2H2O2 -> O2 (g) + 2H2O (l) How many molecules of water are produced from the decomposition of 3.4g of hydrogen peroxide, H2O2? Please help, I got 0.02 molecules of water but need to

42. ## Chemistry

What is the percentage yield for a reaction if you predict the formation of 21 grams of C6H12 and actually recomvered only 3.8 grams? is the answer 18% 3.8g/21g x 100% pls verify.

43. ## statitics

E. Coli outbreak. Outbreaks of E. coli have occurred at a rate of 2.5 per 100,000. Assume this rate represents the mean for the number of outbreaks (as a Poisson random variable). a. What is the probability that at most five cases of E. coli per 100,000

44. ## biology

Could Elodea or Paramecium from a freshwater lake be expected to survive if transplanted into the ocean?

45. ## math

A coordinate grid is used on the plan of a new housing development. fibre optic cable is being laid with a mico-tunnelling machine. the cable will link points with coordinates A(-18,12), B(-8,1), C(3,4), and D(15,7), in a run beginning at D. if one unit on

What are some good ways I could study for my Latin test. It's tomorrow!

47. ## chemistry

The equation for the reaction between hydrogen gas and oxygen gas is: 2H2(g) + O2(g) ---> 2H2O(l) i) How much hydrogen will react with 8g of oxygen? ii) how much water will be formed when 6g of hydrogen react? i would appreciate your help.

48. ## PHYSICS

How much work did the movers do (horizontally) pushing a 140-kg crate 10.1 m across a rough floor without acceleration, if the effective coefficient of friction was 0.60?

49. ## Chemistry

Mercury and bormine react with each other to produce mercury(II)bromide: Hg + Br2 -> HgBr2 a) What mass of HgBr2 can be produced from the reactiion 10g HG and 9g Br2? [the part that really confuses me] What mass of which reagent is left unreacted? b) What

50. ## Physics

How much work must you do to push a 10 kg block of steel across a steel table friction is 0.6 at a steady speed of 1.3 m/s for 9.8 s?

51. ## physics

A body goes from P to Q with a velocity of 10 m/s and comes back from Q to P with a velocity of 20 m/s. What is the average velocity of the body during the entire trip?

52. ## Physics

A block of weight = 25.0 N sits on a frictionless inclined plane, which makes an angle = 34.0 with respect to the horizontal, as shown in the figure. A force of magnitude F= 14.0 N, applied parallel to the incline, is just sufficient to pull the block up

53. ## physics

The escalator that leads down into a subway station has a length of 29.5 m and a speed of 1.6 m/s relative to the ground. A student is coming out of the station by running in the wrong direction on this escalator. The local record time for this trick is 11

54. ## Calculus HARD NEED HELP

The volume of a cone of radius r and height h is given by V=(1/3)pir^2h. If the radius and the height both increase at a constant rate of 2cm/s at which rate in cubic cm/s is the volume increasing when the height is 8cm and the radius is 6cm. So The answer

55. ## chemistry- thank you

If the ÄH of reaction for the following 2ZnS (s) + O 2(g) = 2ZnO (s) + 2S (s) is -290 kJ, then what is the ÄH of reaction for the following reaction: ZnO (s) + S (s) = ZnS (s) + 1/2O 2(g)? Would i flip the first equation? then after that i am lost

56. ## US History

Please help me with these: (I finally finished English 2, and am about to get halfway through this!) 4. Prohibitionists and purity crusaders shared the goal of a. making charity "scientific" b. redistributing the nation's wealth c. ending immigration from

57. ## chemistry

tell me if im right or wrong For Kc,it only includes gas and aq for Kp, only includes gas. What about vapor pressure, do i use (g) notation to represent it

58. ## chemistry

what is the difference between these two equation: delta G= delta H-T(delta S) and deltaG(knot)=delta H(knot)-T(delta S knot) Which G do i use to tell whether the reaction is spontaneous

59. ## chemistry

What volume (in Liters) of oxygen must react to form 17.0L of carbon dioxide according to the following balanced equation: 2CO(g) + O2(g) --> 2CO2(g) 17.0 L CO2 x (1 moles O2/2 moles CO2) = 17.0 x (1/2) = 8.5 L did i do this problem correctly

60. ## mathematics

two springs and two masses are attached in a straight line on a horizontal frictionless surface. the system is set in motion by given external force f(t) acting on the right hand mass m2. we denoted by x(t)the displacement(to the right) of mass m1 from

61. ## PHYSICS

A football is thrown with an initial upward velocity component of 15.0 m/s and a horizontal velocity component of 18.0 m/s The time required for the football to reach the highest point in its trajectory is 1.53s. It gets 11.5m above the ground. How much

62. ## Statistics

The average age of chemical engineers is 37 years with a standard deviation of 4 years. If an engineering firm employs 25 chemical engineers, find the probability that the average age of the group is greater than 38.2 years old. If this is the case, would

63. ## physics

the coefficient of starting friction for wood on wood is 0.55. What is the force of friction of a wood block of mass 3.5 kg being pulled on a wood floor? i think i use the formula F=mMA where F is the force needed to move a solid from rest, m=coefficient

64. ## Physics

A 26 bullet strikes and becomes embedded in a 1.35 block of wood placed on a horizontal surface just in front of the gun. If the coefficient of kinetic friction between the block and the surface is 0.23, and the impact drives the block a distance of 9.9

65. ## poems

for english class i have to write a poem personifying something. I chose to personify a picture in a picture frame. I am not at all good at poems and was wondering if you guys could read mine and tell me what changed i should make and if its really bad and

66. ## chemistry

The propane fuel(C3H8) used in gas barbecues burns according to the following equation: C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O(g) ∆Ho rxn = -2044kj If a pork roast must absorb 2200 kj to fully cook, and if only 10% of the heat produced by the barbecue is

67. ## english

This is an example of a metaphor. Once more in her bed beside the warm cocoon of her sister. What kind of reaction or feeling does this give when you first read it and what is this metaphor saying. Thank you

68. ## chemistry

The equation for the reaction between hydrogen gas and oxygen gas is: 2H2(g) + O2(g) ---> 2H2O(l) i) How much hydrogen will react with 8g of oxygen? ii) how much water will be formed when 6g of hydrogen react? i would appreciate your help.

69. ## Finance

what is the present value of 1000 paid at the end of each of the next 100 years if the interest rate is 7% per year

70. ## Epidemiology

• Consider each of the following scenarios and explain whether the variable in question is a confounder: a. A study of the relationship between exercise and heart attacks that is conducted among women who do not smoke. Explain whether gender is a

71. ## chemistry 150

given the mass of a popcorn kernel. told the % water in kernel, given temperature of water vapor and pressure. find !@#\$%^& many mL of water vapor is there...i know you use PV=nRT but i cant find out what an example of this problem would look like

Hi everyone! May anyone please tell me how to tell how many zeroe's are required in your answer when moving the decimal points in converting metric units? Thank you very much! Please help soon, if possible, as I have a big test coming up! For example, 5.17

what is 14 1/2 - 7 1/5?

74. ## math

a coast guar ship left a port at 30 mph. four hours later a helicopter was dispatched at 90 mph to intercept the ship. how long will it take the helicopter to catch the ship?

75. ## Calculus

The volume of a cone of radius r and height h is given by V=(1/3)pir^2h. If the radius and the height both increase at a constant rate of 2cm/s at which rate in cubic cm/s is the volume increasing when the height is 8cm and the radius is 6cm. So The answer

76. ## computer science

Prove that {NOT, AND, NOR} are universal...

How do I know whether to round all the numbers first, THEN estimate, or to find my answer THEN round? I was doing a favor for my teacher, and I missed that part. She went pretty fast throught the lesson, so I forgot to ask her. Thank you!

78. ## chemistry

write the formula of the conjugate acid for base H2PO

79. ## Math

If you had a fraction strip folded into twelfths, what fractional lengths could you measure with the strip?

80. ## algebra

one plane left an airport at 11:30 am. A second plane, traveling at 320 mph left the same airport at 1:00 pm and overtook the first plane at 4:30 pm. At what speed was the first plane traveling?

81. ## physics

A 33 g particle is moving to the left at 22 m/s. How much work must be done on the particle to cause it to move to the right at 46 m/s?

82. ## Maths

Solve for x: 5sin(2x) + cos(x) = -1.916 Can someone please show me the steps?

83. ## History

would 1924 be during the 20th century?

84. ## English 2

Compose and essay that describes the significance of the Winter Carnival for Gene. What does it symbolize when Finny opens the carnival by burning a copy of The Iliad? Why is it ironic that the Carnival ends with the arrival of Leper's telegram announcing

85. ## physics

A 7.0 kg bundle starts up a 44° incline with 140 J of kinetic energy. How far will it slide up the incline if the coefficient of kinetic friction between

i need help with this quretsion ; i don't know if im right, and i dontknwo what do next question expand and simplfy: 4√7(2√3 + 3√6 - √7) my work = 8√21 + 12√42 -4√49 please help me

87. ## Chemistry

How many milliliters of 6.0 M HCl would be needed if 3.000 g of K2CO3 were used in an experiment?

12 - 5 3/10

89. ## Chemistry

How many grams of KCl would be formed in the reaction of 3.000 g of K2CO3 and HCl?

90. ## english

Tips on amazing speech writing?

91. ## Math.

Nancy Tobey planted a vegetable garden in the backyard. However, the deer and raccoons have been stealing all the vegetables. She asked John to fence in the garden. The rectangular garden measures 8 feet by 15 feet. How many feet of fence should John

6 11/12 - 4 5/12

93. ## physics

An unbanked curve has a radius of curvature of 75m. On a winter day, with snow on the road, the coefficient of static friction between the tires of the car and the road is .23. What is the maximum speed with which the car can safely negotiate the curve?

94. ## Physics

In what distance can a 25 gram bullet traveling at 250m/s be stopped by force of 5000N?

95. ## Chemistry

Posted by ann on Sunday, October 17, 2010 at 4:26am. In melting point determination, why shouldn't a substance be re-melted? (i.e. why should we not re-melt a substance that has previously been melted in a melting point tube?)

96. ## Math

Write each complex number in rectangular form? I need help with this. :/ 2(cos120°+i sin 120°) and 4(cos 7π/4 + i sin 7π/4) ?

97. ## chemistry

At what temperature (C) will a gas sample occupy 6.1 L if it originally occupies 17.8 L at 27.1C? T1V1=T2V2 T1(6.1)=(17.8)(300.25) T1=876? Please check my answer

98. ## physics

a book slides off a table top with a speed of 18 meters per second. it strikes the floor in 0.52 seconds how tall was the table in meters

99. ## algebra

I am thinking of a three digit number. It is am odd multiple of three, and the product of its digits is 24. It is larger than 275. What are all the numbers I could be thinking of? need help thank you

100. ## Physics

Gayle runs at a speed of 3.80 m/s and dives on a sled, initially at rest on the top of a frictionless snow covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they

101. ## social studies

What is the base for the earth's hills and mountains?

102. ## Social Studies 6th grade

Why don't scientists agree on when and how the first people settled in North America?

103. ## chem

what is the pH of a solution that is 0.40 M in sodium acetate and 0.60 M on acetic acid? (Ka for acetic acid is 1.85x10^-5.)

104. ## College Physics

The four tires of an automobile are inflated to a gauge pressure of 2.0x10^5 Pa. Each tire has an area of 0.024m^2 in contact with the ground. Determine the weight of the automobile.

105. ## statistics

The game of roulette uses a wheel containing 38 pockets. Thirty-six pockets are numbered 1, 2, 3, ..., 35, 36, and the remaining two are marked 0 and 00. The wheel is spun, and a pocket is identified as the "winner." Assume that the observance of any one

106. ## statistics

if Ho:Mu=50 and Ha:mu 59 and beta=10 what is alpha if x exceeds 56 for n=49

107. ## Human Services

Summarize legislative tasks and the overall role of the judiciary in shaping public policy. For the same agency or organization you chose previously, describe the laws and judicial decisions that influence how it operates. How do these laws influence the

108. ## college chemistry

A volume of 0.285 L of a gas at STP weighs 0.537 g. Calculate the molar mass of the gas (1)(0.285) = n(0.0821)(273). .0036 is this correct?

109. ## statistics

4.90. Defective Equipment. A piece of electronic eqipment contains six computer chips, two of which are defective. Three chips are selected at random, removed from the piece of equipment, and inspected. Let x equal the number of defectives observed, where

110. ## chemistry

What volume (in Liters) of hydrogen must react to form 17.0L of ammonia according to the following balanced equation: N2(g) + 3H2(g) --> 2NH3(g) Ratio from equation is H : NH3 = 3 : 2 = 3/2 : 1 = 17x3/2 : 17 = 25.5 : 17 17 L of hydrogen can you check my

111. ## statitics

Evaluate these binomial probabilities a. C82 (.2)2 (.8)6 b. C81 (.2)1 (.8)7 c. C80 (.2)0 (.8)8 d. P(X ≤ 1), when n = 8, p = 0.2

112. ## writing

can you give me a few examples on a personal conversation about personal finance and credit cards using five different pronouns?

113. ## Physics

Dave rides his motorcycle off the rim of the Snake River Canyon at a horizontal velocity of 54 meters per second. how far has he dropped (meters) into the canyonin 1.48 seconds? NOTE: assume he does not hit the bottom.

114. ## Chemistry

Determine the mass of zinc sulphide,ZnS which is produced when 6.2 g of zinc and 4.5 g of sulphur are reacted.

115. ## statitics

Approximately 40% of all U.S. households own at least one dog (according to the humane society). Suppose 15 households are randomly selected for a pet ownership survey. a. What is the probability that exactly eight of the households have at least one dog?

116. ## Thermochemistry

It takes 45.0 J to raise the temperature of an 9.70 g piece of unknown metal from 13.0 degrees C to 24.5 degreesC. What is the specific heat for the metal?

117. ## statitics

Let X be a Poisson random variable with mean µ = 2.5. Use Table 2 in Appendix I to calculate these probabilities: a. P (X ≥ 5) b. P(X < 6) c. P(X = 2) d. P(1 ≤ X ≤ 4)

118. ## statitics

Intensive Care. The number X of people entering the intensive care unit at a particular hospital on any one day has a Poisson probability distribution with mean equal to five persons per day. a. What is the probability that the number of people enterin the

119. ## statistics

What would be the range of the scores 71, 37, 48 from the same set with 95% cofidence level?

120. ## Physics

A 25 kg chain initially at rest on a horizontal floor requires a 365 N horizontal force to set it in motion. Once the chair is in motion, a 327 N horizontal force keeps it moving at a constant velocity. a. Find the coefficient of static friction between

121. ## Math Correct or not Correct?

Correct or not correct?? 9 1/6 + 6 1/4 = 15 5/12

122. ## Physical Science

Julia and Wayne heat their house during the winter with an electric heater. The thermostat on the heater is set to 20 °C and the thermostat is cycling on and off as it keeps the room temperature stable. Julia walks out of the room leaving the light on.

123. ## Physics

How much work did the movers do (horizontally) pushing a 140-kg crate 10.1 m across a rough floor without acceleration, if the effective coefficient of friction was 0.60?

124. ## Physical Science

Tony is driving across the outback in the middle of the night. He finds that he is running out of gas and might not make it to the next town. He tells Julie, his passenger, that he’s going to turn off the headlights in order to save fuel. She tells him

125. ## Chemistry

Hi I just wanted to verify a few answers to chem questions I'm working on. Was wondering if anyone could help? 1. Calculate the molar concentration of 2.34g of lithium hydroxide, LiOH disolved in water to make 750ml of solution. My answer was CLiOH = 0.133

126. ## Social Studies

If you were writing the Jamestown *Setting *Living *Characters *Problems What would you include for these topics?? (I need it in bullet form)

127. ## Physical Science

Bob and Christine are sweltering in their hot office. Bob props opens the door of the refrigerator, and says that this will help keep the room cool. Christine says that this won’t work, and in fact the room will gradually get hotter than if the fridge

128. ## geometry

what is the volume of a box if the box measure is 70

129. ## Physics

A 2.9 kg block slides along a frictionless surface at 1.3 m/s. A second block, sliding at a faster 5.0 m/s, collides with the first from behind and sticks to it. The final velocity of the combined blocks is 2.7 m/s. What was the mass of the second block?

130. ## ORIENTATION MAKEUP

A. essay questions. B. suggested activities. C. practical exercises. D. multiple-choice questions.

131. ## physics

a book slides off a table top with a speed of 18 meters per second. it strikes the floor in 0.52 seconds how tall was the table in meters. Is this how t looks? h= 1/2 x 32.2 x 0.52 square

132. ## Physical Science

Natasha says that in a car, the accelerator pedal is used to make the car go faster, and does not actually waste fuel. It is the brake pedal that wastes fuel. Is she right? Why?

133. ## Meteorology

A gas bubble with a volume of 3 milliliters (ml) originates at the bottom of a lake where the pressure is 4.0 atmospheres (atm). What will the bubble's volume be when it reaches the surface, assuming the temperature doesn't change?

134. ## Physics

That neighbor's pesky kid now has new missiles that make elastic collisions. He insists on throwing 25.0 g rocks at your new 2.25 kg light fixture hanging by a 26.0 cm wire from the ceiling of your porch. If each rock strikes the fixture traveling at 10.0

A bomber flying horizontally at 250 m/s releases a bomb 1500m above the ground. At the point of impact, what were the horizontal speed and vertical speed?

136. ## math 20

Jeremy has a balance owing of \$4000 on his credit card. The credit-card company charges 18.0% annual interest, compounded monthly. 1.) If Jeremy makes payments of \$300 every month, how much will he still owe after making 12 payments? 2.)Determine the

137. ## computer science

prove (a) A(+B)=AB & (b) A+B=A+B both algebraically and using the truth table.

A car launches itself off a 20° ramp at the top of a 25m cliff travelling at 35 m/s. How long will it be in the air for and how far from the base of the cliff will it land?

What is the unscrambled way of "Artiotinm"????

140. ## gen chem

what is the concentration of an aqueous solution when you add 9.58x10^-4 moles of copper nitrate to 42ml of water

141. ## statistics

In the July 29, 2001, issue of The Journal News (Hamilton, Ohio) Lynn Elber of the Associated Press reported on a study conducted by the Kaiser Family Foundation regarding parents’ use of television set V-chips for controlling their children’s TV

142. ## Chemistry

What is the largest atom in period 2 of the periodic table?

143. ## English

Which sentence is correct? 1) Check the manufacturing dates of the products. or 2) Check the manufacture dates of the products.

144. ## Math

15 1/6 - 6 5/12 ok so I know 15 1/6 = 15 2/12 right? but you can't subtract 5 from 2?

145. ## chemistry

At what temperature (C) will a gas sample occupy 6.1 L if it originally occupies 17.8 L at 27.1C? T1V1=T2V2 T1(6.1)=(17.8)(300.25) T1=876? Please check my answer

146. ## chemistry

what is the difference between these two equation: delta G= delta H-T(delta S) and deltaG(knot)=delta H(knot)-T(delta S knot) Which G do i use to tell whether the reaction is spontaneous

147. ## history

explain reign of terror face in the french revoloution. discuss robesperre's involvement and evolution of \his political views. do u think it was neccessary in the revolution? what lessons can be learned from this event? i have to write an essay on this

148. ## chemistry

tell me if im right or wrong For Kc,it only includes gas and aq for Kp, only includes gas. What about vapor pressure, do i use (g) notation to represent it

149. ## spelling

I need help with unscambling a word.The word is suit,fret,tell,pliers can you help me with the words please

150. ## Chemistry

Determine the mass of zinc sulphide,ZnS which is produced when 6.2 g of zinc and 4.5 g of sulphur are reacted. This question is really confusing me, and I'm not sure where to start. I think I have to calculate the moles of each given reactant first in

151. ## math

a freight train that is 1 mile long is traveling at 60mph. a second train that is 2 miles long is traveling 40mph. the trains are moving in opposite directions on parallel tracks. how many seconds does it take between the time their locomotives meet and

152. ## chem - check my answers?

i already posted this but i tried to solve it on my own can you check at the end of this paragraph? The study of kinetics group 1: Temp: 12.6 C T(K): 12.6+273= 285.6 1/T(K): 3.50X10^-3 this one is the x value Time: 816 sec Rate ®: 7.66 x10^-6 LnR: -11.8

Most people think of bamboo as a tree or a bush. I have to pick out the verb and tell if it's transitive or intransitive think=intransitive

154. ## English

Thank you very much for your corrections. I would kie to know if everything is OK in these sentences, too. 1) Mickey phoned about the audition for Best Days.He’d like to know what time the audition starts. 2)The secretary tells him the audition starts at

155. ## Physics

Ok so I am not so bad at physics but I find it hard to understand formular like how to use this one mu *m*g= I know its somewhat related to friction but what is the mu stand for and g too IF someone could plzz translate these symbols to words I would

156. ## calculus

Regard y as the independent variable and x as the dependent variable and use implicit differentiation to find dx/dy. y sec(x) = 9x tan(y)

1 1/6 - 3/4?

158. ## Foods

what cooking tool is used to make sauces which do not contain milk? I know I have asked this question already but I have still not a found very good answer. The sites that people have gave me are not helping infact they are just showing me how to cook

159. ## physics

Greg is walking in a daze. He first walks 1000m NE. Then he walks 3000m S and finally 2200m 20° N of E. How far away did Greg end up from the starting point and in which direction?

160. ## Maths

Find the La Place Transform of a.) f(t)=t b.) f(x)=y"+2y'+Y

161. ## English

I forgot to include the following statements. I really hope you can have a look at them too. 1) They regretted missing OR having missed the bus. 2) They escaped with a ship or by a ship. 3) I have my groceries delivered by the supermarket. 4) Petra lives

162. ## chemistry

calculate the theoretical amount of CaCl2 that would be required to change the temperature of 50ml of water from room temperature 20C to 45C? Remember heat loss during the dissolution is equal to the heat capacity of water. this value is 4.184. you assume

163. ## trigonometry

what is sin 35=x/6

164. ## Biochemistry

Liver alcohol dehydrogenase (ADH) is a nonspecific enzyme. Its normal substrate is ethanol but it will oxidize other primary alcohols like methanol. Methanol produces formaldehyde which is quite toxic and can lead to blindness. A dog ingested about 36 ml

165. ## physics

Rockets A and B are fired straight upward from rest. Rocket A is launched first and accelerates at 11.2 m/s2. Rocket B is launched 2.10 s after Rocket A and B accelerates at 14.6 m/s2. Solve for the moment in time when the rockets are separated by 484 m.

166. ## physics

What pressure (atm) is exerted by a column of ethanol 65.0 cm high? The density of ethanol is 0.789 g/cm3 and 9.8m/s2 as your gravitational

167. ## chem

5. The LC50 for fluorine is 0.29 mg/m3. What is this in ppm at 25 oC and 1 atm pressure? How does this compare to the PEL?

168. ## English

I'd like to know if the following sentences (+alternatives) in indirect speech are possible. Thank you very much in advance. 1) “Would you like to have lunch with me on Sunday?”, he said to me. He invited (and not: "requested, offered) me to have lunch

169. ## Math Stil don't know how to do this problem :(

15 1/6 - 6 5/12 help explain?

170. ## management

I needhelp findng informaton on the Key External Factors For Wal-Mart. I am doing a paper on walmarts matrix stragtegy

171. ## physical

How can I train my body to run faster and run longer distances?

172. ## Informative/Analytic Essay Assignment

For my essay I have to pick a county in Georgia and collect information about it's demographics and stuff. Then I have to do the same about my university (georgia state university). and then analyze and compare the data for the two. This is what I have so

173. ## Algebra

How would I solve: 1/3(D+3)=5 I know you need to find the recipicile, but I have no idea how to solve this.

What are the d themes of geography ,

175. ## English

The Scarlet Letter- How does the reverend Mr. Wilson interpret the baby's response to Dimmesdale's entreaty? What significance do you think the baby's response may have?

176. ## Physics

A 1300 sports car accelerates from rest to 90 in 6.5 . What is the average power delivered by the engine?

177. ## algebra

the officejet printer can copy maria's dissertation in 18 min. The laserjet printer can copy the same document in 22 min. If the two machines work together, how long would they take to copy the dissertation?

178. ## US History

I need help with this: Write 3 questions to ask farmers about new machinery and farming techniques that helped them farm the Great Plains. I have no idea what I would ask... -MC

179. ## math

verify, 1+csc - 0 ---------- = sec0 cos(-0)+cot(-0) 0 is angle.

180. ## physics

if you pushed 50 newtons up 2 meters what was the length of the ramp

182. ## English

I forgot to include the following two alternatives. Thank you very much for your cooperation. 1)"Shall I get a candle?", he said. He wondered whether he should get a candle. He wanted to know if he should get a candle. 2)He asked me if I would like to have

183. ## Physics

A block of weight = 25.0 sits on a frictionless inclined plane, which makes an angle = 34.0 with respect to the horizontal, as shown in the figure. A force of magnitude = 14.0 , applied parallel to the incline, is just sufficient to pull the block up the

184. ## English

make 2 words, first one 8 letters and second work 4 letters out of these s l r t n r u p a e s a

185. ## Thermochemistry

A total of 2.00 mol of a compound is allowed to react in a foam coffee cup that contains 167 g of water. The reaction caused the temperature of the water to rise from 21.0 to 24.7 degrees C. What is the enthalpy?

"Leadership Development within Groups: Managing Conflict." Identify a conflict that has occurred recently within a group you are a part of. List the reason(s) for the conflict. Was the conflict resolved the same day? If so, what conflict style(s) were used

187. ## english

does added and consume mean the same thing?

188. ## chemistry- Thank you

Suppose you add 81 ml of dilute acid to 54 ml of water. Both the water and acid were at room temperature (22 C) before being mixed. The temperature of the solution increased to 42 C. How much energy (in kJ) was released by the dissolution of the acid if

what is the answer showing work to 8(2h-10)=16h

190. ## physics

alpha

Can the word "his" be a personal and a possessive pronoun? If so, can you give me a couple of sentences so I can see the difference. Thanks

192. ## Physics

A football is thrown with an initial upward velocity component of 15.0 m/s and a horizontal velocity component of 18.0 m/s The time required for the football to reach the highest point in its trajectory is 1.53s. It gets 11.5m above the ground. How much

193. ## science

a microscope has two of these

194. ## Chem

The specific heat capacity of aluminum is .89 J/y degrees C. How much heat is required to change the temp of 1500g aluminum pan from 25 degrees C to 100 degrees C?

195. ## Statistics

What are the most prudent decisions Avionics, Inc.can make about it's responsibilities to itself and others?

196. ## History

would people wanting to have an anglo-saxon race be considered a social issue?

197. ## Physics

A military helicopter on a training mission is flying horizontally at a speed of 60.0 m/s when it accidentally drops a bomb (fortunately, not armed) at an elevation of 300 m. You can ignore air resistance. How much time is required for the bomb to reach

198. ## science

a microscope has two types of these

199. ## physics

Two charged particles in an accelerator are at rest until an electric field causes them to accelerate away from each other when the field switched is turned on, particle a accelerates to the left at 8.97e+07 m/s2 while particle B accelerates to the right

200. ## Physics

An Olympic basketball player shoots towards a basket that is 5.98 m horizontally from her and 3.05 m above the floor. The ball leaves her hand 1.90 m above the floor at an angle of 60.0o above the horizontal. What initial speed should she give the ball so

201. ## math

A coordinate grid is used on the plan of a new housing development. fibre optic cable is being laid with a mico-tunnelling machine. the cable will link points with coordinates A(-18,12), B(-8,1), C(3,4), and D(15,7), in a run beginning at D. if one unit on

202. ## english

How do the characters, plot, and theme of The Great Gatsby support or refute the statement that "the Jazz-Age society was a bankrupt world, devoid of morality, and plagued by a crisis of character"?

203. ## math 116

In 1995, the life expectancy of males in a certain country was 65.3 years. In 1999 it was 68.8 years. Let E represent the life expectancy in year t and let t represent the numbers of years since 1995. the linear function E(t) that fits the data is,

204. ## Chem

The specific heat capacity of aluminum is .89 J/y degrees C. How much heat is required to change the temp of 1500g aluminum pan from 25 degrees C to 100 degrees C?

205. ## world history honors

was the reign of terror neccesary for the French Revolution? What can we learn from the French Revolution? help please ;)

A 4.3 kg bucket of water is raised from a well by a rope. The acceleration of gravity is 9.8 m/s2 . If the upward acceleration of the bucket is 4.6 m/s2, find the force exerted by the rope on the bucket. Answer in units of N. I'm almost sure the answer

207. ## physics

A 143-g baseball is dropped from a tree 13.0 m above the ground. With what speed would it hit the ground if air resistance could be ignored? If it actually hits the ground with a speed of 8.00 m/s , what is the magnitude of the average force of air

208. ## Algebra

You have 50 yards of fencing to enclose a rectangular region. Find the dimensions of the rectangle that maximize the enclosed area. What is the maximum area?

209. ## Physics

In the rope climb, a 68 kg athlete climbs a vertical distance of 9.0 m in 13 s. What minimum power output was used to accomplish this feat? In Watts

210. ## geometry

make a conjecture about the item in the sequence 6, 8, -32, 120 pick ansewr a. 116 b.-480 c.122 d-488

211. ## writing

I need to write several sentences describing a interaction with a friend or family member about personal finance or credit cards, using five different pronouns in the sentences. Can you please give me some understanding or examples?

212. ## Math:)

4 1/2 - 2 7/8

213. ## Chemistry

Hi please help with this. You will mix 5 ml of each 2M HCL and 2M NaOH solutions, calculate the concentration of NaCl formed in the new solution?

214. ## physics

a soccer ball is kicked with an initial velocity of 5.0 m/s^2 in a direction of 30 degrees above the horizontal a. what are the initial components of the velocity? vix= viy= b. what are the components of the veloicty just before the ball hits the ground?

215. ## chem-Bob

What pressure (atm) is exerted by a column of ethanol 65.0 cm high? The density of ethanol is 0.789 g/cm3 and 9.8m/s2 as your gravitational constant. mass*gis the weight of the column density*h*area*g= weight density*h*g= pressure Thanks for your help Bob.

216. ## chemistry

the word equation for sodium and water is: sodium+water-->sodium hydroxide+hydrogen sodium and chlorine: sodium+chlorine-->sodium chloride what will the equation for aqueous chlorine with aqueous potassium iodide be?

217. ## chemistry II

What are the steps to balancing Redox reactions using the Valence method. thanks> ex problem: NH3+O2 -->H2O +NO

218. ## physics

A tank is moving away from a soldier with a bazooka at a constant velocity of 7.80 m/s. The bazooka fires a missile which accelerates from rest at 23.2 m/s2. The soldier fires the bazooka when the tank is 185 m away. A. How long is the missile in the air?

219. ## English

As she flipped through the newspapers, she saw headlines such as "Food shortages hit Mitika," "Hurricane departs coastline," and "Elkwood ravaged by flooding." Is my apostrophe and comma usage correct? Newspaper headlines are supposed to be lowercased,

220. ## HELP

I run I jump I am one of four you find me hanging around your door

221. ## English

What does this mean? It was still raining the morning when Mama told me. Mama was crying, and the rain made it seem as if the whole world was cry. What kind of mental image does this demonstrate?

222. ## physics grade 11 (vector)

An airplane is flying 400 km/h west. There is a wind blowing 100 km/h NE. What is the airplane's actual speed and heading?

223. ## chemistry

A 0.1943g iron ore sample was dissolved in hydrochloric acid and the iron was obtained as Fe 2+ (aq). The iron solution was titrated with Ce 4+ solution according to the balanced chemical reaction shown below.After calculation, it was found that 0.0237 g

224. ## chemistry

If two beakers of water have the same temperature of 1000C, but one contains 100 mL and the other has 300 mL, what can you conclude?

225. ## chemistry

A student needed to standardize a solution of NaOH which was approximately 0.125 M. The student carefully prepared the titration setup, but after 25 mL of NaOH was added, what was the pH of solution if initially flask contains 25 mL of 0.250 M HCl

226. ## Physics

A block of weight = 25.0 N sits on a frictionless inclined plane, which makes an angle = 34.0 with respect to the horizontal, as shown in the figure. A force of magnitude = 14.0 N, applied parallel to the incline, is just sufficient to pull the block up

227. ## Math

1. y= ax2 + bx + c, a>0 to determine what does b and c do. 2. Xv= -b/2a, where did the -b/2a come from.

228. ## Math

9 3/4 + 7 7/8

229. ## Calc

When you are solving for the point of intersection between planes do you follow the same steps when solve for the point of intersection between lines?

230. ## Biology

A gamete has ___ of the genetic information of their present cells and of regular body cells. A) exactly the same amount B) half C) double D) some Thanks!

231. ## college

I need to write a topic sentence outline from researching sources pretaining to drug addiction and also create a reference list

232. ## physics

a block of mass slides off the edge of a 2 foot tall table at 3.13m/sec. how far away from the edge of the table does it land?

233. ## science

what two factors combine to give a person weight on Earth?

234. ## calculus

find dq/dp.q=(5p^2+2p)-3/2 use impliict differentiation to find dq/dp

235. ## Math

5 1/6 - 4 7/12

236. ## Algebra

How would I solve -32=8/7(3w-1) I have no clue.. ._. These problems stress me out

237. ## Englis

Dear teachers ,Please read this paragraph and fix the errors.please !!! Shahrazad is main character of the one thousand and one nights. She is a good story teller, a Psychiatrist, and a guru. She is a fearless woman, determined to safe her female gender

238. ## chemistry

A mixture of CaCO3 and MgCO3 weighing 7.85 g was reacted with excess HCL. The reactions are CaCO3+2HCL=CaCl2+H2O+CO2 and MgCO3+2HCl=MgCl2+H2O+CO2. The sample reacted completely to produce 1.94 L CO2 at 25 degrees C and 785 torr. Calculate the percentage of

239. ## math

write down the value of 27 1/3

240. ## Physics

A 285-kg load is lifted 22.0 m vertically with an acceleration a=0.170 g by a single cable. Determine the tension in the cable. (N) Determine the net work done on the load. (J) Determine the work done by the cable on the load. Determine the work done by

241. ## physics

An ice hockey puck slides along the ice at 12m/s. A hockey stick delivers an impulse of 4.0kg*m/s causing the puck to move off in the opposite direction with the same speed. What is mass of puck?

242. ## Physics

How much work did the movers do (horizontally) pushing a 140-kg crate 10.1 m across a rough floor without acceleration, if the effective coefficient of friction was 0.60?

243. ## algebra

If f(x)=x^2-x, find the value if x=(2)-2. TIP: x^2 means x squared

244. ## calc

(e^x + e^-x)/2=1

245. ## social studies

what did the clergy receive from the lords?

246. ## history

workman is underbid in labor market What does this mean? I've looked up the word underbid: to bid less then but I still don't quite understand Could someone explain this

247. ## math

1/8 + x =1/5

how do bacterial plasmids relate to resistance and how do they relate to genetic engineering. i am very syuck and i need help please

249. ## Physics

A spring-loaded toy gun is used to shoot a ball of mass m=1.5 kg straight up in the air. The spring has spring constant k=667 N/m. If the spring is compressed a distance of 25.0 centimeters from its equilibrium position and then released, the ball reaches

250. ## algebra

solve the systems of equations {4/7x+y=2/7 -1/8x-3/4y=-11/4 a. the solution of the system is b. there are infinitely many solutions c. there is no solution

251. ## AED 201

HOW WILL YOU EVALUATE YOUR PROGRESS? WHAT WILL HELP KEEP YOU MOTIVATED TOWARD ACHIEVING THOSE GOALS?

252. ## math

expand x^(4-2x)

253. ## college algebra

a bus driver wants to average at least 40 miles per hour on a 70 mile trip. if the first 35 miles takes the driver 1 hour what should be the lowest average speed for the second 35 miles?

254. ## Microeconomics

Suppose a second nation has the following data. Plot the PPC, and then determine which nation has the comparative advantage in which activity. Show whether the two nations can gain from specialization and trade.

PLEASE ANSWER THE FRACTION 14 OVER 15 - THE FRACTION 1 OVER 2. HURRY!

256. ## Chem

5. The LC50 for fluorine is 0.29 mg/m3. What is this in ppm at 25 oC and 1 atm pressure? How does this compare to the PEL?

257. ## Calculus

Find the derivative of f(x) = ln(48e3x − 11)

258. ## Chemistry

You receive two samples of a substance. After testing, it shows that one sample contains 88% oxygen by mass an 12% hydrogen. The second sample contains 94% oxygen and 6% hydrogen. Is it possible that the two samples are the same? Explain. thanks, I

259. ## math

the perimeter of a rectangle is 147 meters the length is 15 meters less than 5 times the width find the dimension

260. ## Math - Geometry

Please help! Need to find the 6th and nth terms in this sequence - and solve for the rule or process. here's the sequence: 1,3,9,27,81 What is the process or formula to get the nth term in the sequence. Thanks!

261. ## Algebra/Math

Can you check these for me. Directions: Find the slope of the line that passes through each pair of points. 1. (3,-8) and (-5,2) Answer: -10/8 2. (-10,-3) and (7,2) Answer: -5,-17 3. (-7,-6) and (3,-6) Answer: 9 4. (8,2) and (8,-1) Answer: 0 undefined

262. ## Calculus

Find the derivative of y = 2√s7 + 13

263. ## Music

The musical movement that started in the mid-1960s on the West Coast was the _____ movement. A. Folk B. Rock C.psychedelic D. progressive

264. ## math

these two rectangles are the similar, rectangle number one: the width is 42cm and the height is 27cm. rectangle two: the width is 56cm find x.

265. ## trig

find all values of degrees in the set (o,2 pi) satisfying cos of degree over 3 equal to square root of 3 over two and -cosdegree + 2sindegres=-2

266. ## statistics

For a particular sample of 71 scores on a psychology exam, the following results were obtained. First quartile = 58 Third quartile = 86 Standard deviation = 8 Range = 50 Mean = 75 Median = 72 Mode = 74 Midrange = 55

267. ## Math

A man and his wife share a sum of money in the ratio 3:2. If the sum of money is doubled, in what ratio should they divide it so that the man still rceives the same amount?

268. ## statistics

there are 100 males and 100 females in a club. 80 of the men and 10 of the women are scientists. what is the probability one person is chosen to interview p(female scientist)

269. ## College Chemistry

Draw an orbital diagram showing valence electrons and write the condensed ground-state electron configuration for Se3+

270. ## Calculus

Find the derivative of y = (8+e^5x)^3

271. ## College Chemistry

Write the condensed ground-stste electron configuration of the transition metal ion Mo3+

272. ## Calculus

Find the derivative of f(x) = ln(48e^3x − 11)

273. ## science

how do bacterial plasmids relate to resistance and how do they relate to genetic engineering. i am very stuck and i need help please

274. ## Physics

A 25 kg mass is on a level, rough surface where the force of friction is a constant 15 N. A horizontal applied force of 65 N acts on the mass. The mass is initially at rest. What speed does that mass have after being moved 2.0m?

275. ## physics

Consider a frictionless track as shown in the figure below. A block of mass m1 = 4.25 kg is released from A. It makes a head on elastic collision at B with a block of mass m2 = 10.0 kg that is initially at rest. Calculate the maximum height to which m1

276. ## management

Does anyone why walmart does not have a formal mission statement or where I can find out why

Roberta sold fifty tickets for the school play. Roberta sold ten more student tickets than adult tickets. How many student tickets did Roberta sell? From this result, if the total cost of a student ticket was three-fourths the cost of an adult ticket, and

279. ## MATH

WRITE DOWN THE VALUE OF (4XY)

What does charlie realize about himself when he takes the rorschach test on april 22?

281. ## Chemistry

You receive two samples of a substance. After testing, it shows that one sample contains 88% oxygen by mass an 12% hydrogen. The second sample contains 94% oxygen and 6% hydrogen. Is it possible that the two samples are the same? Explain. thanks, I

282. ## US History

What are the advantages and disadvantages of moving from the state of Georgia to New York City? I know one disadvantage is that New York is a very expensive place so it's tough living there, and their weather conditions can be extreme, especially in the

283. ## college

Q. A soccer ball is kicked from the ground. When it reaches a height of 5.74 m, the velocity is v=5.86i+7.50j m/s. a) Determine the maximum height that the ball reaches. b) Determine the total horizontal distance travelled by the ball. c) What is the speed

284. ## physics

"An unbaked curve has a radius of curvature of 75m. On a winter day, with snow on the road, the coefficient of static friction between the tires of the car and the road is .23. What is the maximum speed with which the care can safely negotiate the cure?"

285. ## english

I found 2 foil character in ROMEO AND JULIET can need one more please with (act and scene and line)thank for your help.

286. ## trig

how to do the calculation while taking 'A' as 15 in the half angle formula used for calculating the value of sin 7.5 ?

287. ## Biology

25. If there are 12 chromosomes in an animal cell in interphase of the cell cycle, what is the diploid number of chromosomes for this organism? A) 6 B) 24 C) 36 D) 12 E) 48

288. ## Geometry

Use the Law of Detachment to write a valid conclusion for the given information. 1.If two angles are supplementary, then their measures have a sum of 180. 2.Angle X and Angle Y are supplementary. Would the conclusion be this? Thanks -The sum of X and Y is

289. ## chemistry

A 16.5 cm3 bubble under the ocean at 2.1 atm and 12.5oC surfaces to 1.0 atm and 22.1oC. What is the new volume (in cm3)? i used (p1)(V1)/T1=(P2)(V2)/T2 (2.1)(.0165)/285.65=(1)(V2)/295.25 THE ANSWER I GOT IS .0335 i changed 16.5 to liters which is why its

290. ## Math

Just so I know I am understanding this, can you please let me know if I am doing this right? Simplify: 24u - 6(8 - 4u) + 52 24u -48 + 24u + 52 48u + 4 Thanks!!!!

291. ## math

if cosA is 5/13 and tangent Ais 5/12 how do i find the sine

292. ## Physics

Suppose a circular platform is rotating at a constant rate of 24 rev/min. How far away from the centre would one need to stand in order to have an radial acceleration of 9.9 m/s2? Express your answer in cm.

293. ## Chemistry

I conducted a simple titration experiment and i need to write how and why are the results reproducible can some one help me in answering this. Thankyou C.

294. ## math

For each value of z*, find the cumulative probability P(Z< or equal to z*). (Round all answers to four decimal places.) z*=0 z*=0.3 z*=-0.3 z*=1.84 z*=-2.38 z*=2.78 z*=1.67 you may need to use the table for standard normal probabilities

295. ## Math

Use 2nd Fundamental Theorem of Calculus to find derivative of f(x) = integral of 2x^2 to x-5 of square root of Sin(t)dt. Please help.

296. ## english

I'm doing an analysis on a class text and a self chosen related text and one of the things the sheet says to do is to identify and define the context of my related text. What does this mean?

297. ## math

Between 20 and 28 students signed up for the chess club. The students could not be divided exactly into groups of 2, 3, 4 and 5. How many students signed up for the chess club? Show your work

298. ## college/human services

I am writing a paper about the affect of political and technical aspects of planning and evaluation on a senior center. Can anyone help with links to what the political aspects are? I found some for the technical aspects and they relate to evaluations

299. ## Social studies

What were the economic, political, and social aspects of New Netherland, New Spain and New France?

300. ## physical education

please correct me if i am wrong the body has 3 different joints: A. fixed or immovable joints B. slightly movable C. freely movable

301. ## history

was the reign of terror necessary? what can we learn from it? pleasse help!!

302. ## math

one side of a right triangle is 8 cm.the hypotenuse is 3 cm.more than twice of the other side.what is the measure of the other side?illustrate using the pythagorian theorem

303. ## physics

Q. A person wants to shoot a rocket off of a mountain 3.26 km high so that the rocket, when shot at 31.3¡Æ above the horizontal from the very top of the mountain, lands at the foot of the mountain 9.37 km (horizontal distance) away. a) What initial speed

304. ## Chemistry

In melting point determination, why shouldn't a substance be re-melted? (i.e. why should we not re-melt a substance that has previously been melted in a melting point tube?)

305. ## chem

A 16.5 cm3 bubble under the ocean at 2.1 atm and 12.5oC surfaces to 1.0 atm and 22.1oC. What is the new volume (in cm3)? i used (p1)(V1)/T1=(P2)(V2)/T2 (2.1)(.0165)/285.65=(1)(V2)/295.25 THE ANSWER I GOT IS .0335 i changed 16.5 to liters which is why its

306. ## English

Which sentence is correct? 1) This product is due for retest. or 2) This product is due for retesting.

307. ## Physics

A wooden block and a lead ball are connected by a light string that passes over a frictionless pulley. The block has a mass of 6kg and the ball has a mass of 2kg. after they are released from rest, the block will slide along the wooden ramp. a.) which

308. ## chemistry

A balloon is filled with 2.3 cm3 helium gas at 112.1 atm pressure. What will be the new pressure (atm) if the volume is changed to 44.7 cm3? P1V1=P2V2 (112.1)(.0023)=(P2)(.0447) the answer i got was 54.85 so would the answer be 54.85 atm?

clue Nasty facial expression using these letters to answer question UNGGGIEMANM

310. ## chem 121

We did a lab separating out the components of a mixture. One of the lab questions is "The weight of naphthalene was obtained by weighing the collected solid. Was this an accurate weight of the naphthalene present in the original sample?" I don't know how

311. ## Math/Vectors

If a point on the surface of a sphere with its center at the origin has coordinates (9,4,6) how do you show the radius connecting the origin to this point as a position vector. Is it simply [9,4,6] or is it more complicated than that. Thanks.

312. ## physics

An unbanked curve has a radius of curvature of 75m. On a winter day, with snow on the road, the coefficient of static friction between the tires of the car and the road is .23. What is the maximum speed with which the car can safely negotiate the curve?"

313. ## economics (game theory)

For anyone with experience working with game theories... 1.) Two animals are fighting over some prey. Each can be passive or aggressive. Each prefers to be aggressive if its opponent is passive, and passive if its opponent is aggressive; given its own

314. ## chemistry

A 25.0 g piece of copper at 90.0 C is placed in 100.0 g of water at 20.0 C. What is the temperature (in C) of the water once the system reaches equilibrium? The molar heat capacity of copper is 24.5 J/(mol·K).

315. ## Mathmetics

9:00 AM to 2:45 PM you have to write a mixed number for each time period in lowest from

316. ## math

how do you show that line 3x+y-2=0 is a tangent of the curve y=(4x-3)(x-2) and how to find the point of contact??

317. ## Photography

What's the difference between the setting of the enlarger height and focusing the image? Aren't both of the dealing with the light that shines onto the baseboard?

318. ## physics

a ball is dropped off a 20m high building, the ball weights 5 g. how long does it take to hit the ground and what is the instaneous speed of the the ball at each second of it's fall?

319. ## english

foil is character who provides contrast to another character. I FOUND ONE IN (ACT1,SCENE 4 LINE 27-28) ,(ACT 2 SCENE I LINE9-11)and I just found the 3 one (act1 scene1 line 69-73) can check if is right ?thank you

320. ## math

show that the curves y=2x^2+5x y=x^2+4x+12 y=3x^2+4x-6 have one point in common and find coordinates??

321. ## Algebra, explain how to please

Can someone explain to me how to solve -14=2/5(9-2b) It would be greatly appreciated thank you

322. ## Chemistry

Which has a larger radius, Mg or Mg+2? Explain why. Thanks ! I think its Mg+2 but im not sure why.

323. ## Math

How about this one? Simplify: -(21k - 3 + 4) - 17k -21 + 3 + -4 - 17k -38k + -1

324. ## math

staright line y=x-1 meets curve y=x^2-5x-8 at the points A and B. the curve y=p+qx-2x^2 also passes through ponts A and B. what are the values of p and q?? helpppppplease...thanks

325. ## HISTORY

please could someone help me answer this question why relations between britain and germany changed in the years 1936-1939? was it because britain didn't want to get involved with germany because they didn't want another war to start? im not sure what to

326. ## ETH 125

Religious discrimination against Muslims and Arab-appearance people rose steeply in the United States after 9/11. Consider the differences between Arabs, Muslims, and Arab Muslim extremists and fundamentalists. What may be done to maintain the American

327. ## chemistry

At 16°C a sample of ammonia gas exerts a pressure of 11.7 atm. What is the pressure when the volume of the gas is reduced to one-fourth of the original value at the same temperature so the inital Temp=16 C initial Pressure. 11.7 final pressure-unknown

328. ## chemistry

design an experiment which will allow you to produce exactly 12.5gr of pure dry Copper Hydroxide also need equipment required chemicals required step by step any limitations cautions

329. ## statistics

for a particular sample of 77 scores on a psychology exam, the following results were obtained: first quartile=44, third quartile= 71, standard deviation=6, range=45, mean=64,median=57, mode=32, midrange=60 a)according to chevyshev's theorem how many

330. ## drwls history

please could i say a huge thankyou you have helped me alot and i appreciate it thankyou again you are a star! :]

what does the value of G=6.67e-11 tell us about the force of gravity

332. ## physics

A ramp 17.5 feet in length rises to a loading platform that is 3 1/3 feet off the ground. Find the angle that the ramp makes with the ground.

333. ## physics

A merry-go-round in the park has a radius of 1.8 m and a rotational inertia of 900kgm^2. A child pushes the merry-go-round with a constant force of 80 N applied at the edges and parallel to the edge. A frictional torque of 12 Nm acts at the axle of the

334. ## math

A coordinate grid is used on the plan of a new housing development. fibre optic cable is being laid with a mico-tunnelling machine. the cable will link points with coordinates A(-18,12), B(-8,1), C(3,4), and D(15,7), in a run beginning at D. if one unit on

335. ## Physics

A 1.80 kg block slides on a frictionless horizontal surface. The block hits a spring with a speed of 2.00 m/s and compresses it a distance of 11.0 cm before coming to rest. What is the force constant of the spring?

336. ## Social Studies

What ideas convinced people to fight for the Continental Army?

337. ## Chemistry

A 16.5 cm3 bubble under the ocean at 2.1 atm and 12.5oC surfaces to 1.0 atm and 22.1oC. What is the new volume (in cm3)? i used (p1)(V1)/T1=(P2)(V2)/T2 (2.1)(.0165)/285.65=(1)(V2)/295.25 THE ANSWER I GOT IS .0335 i changed 16.5 to liters which is why its

338. ## Social Studies

A these statement about the goals of the labor movement in the 1800's and the barriors to achieving these goals

339. ## footprints

list two ways you can clam down or cool off.

340. ## math

(e^x + e^-x)/2=1

341. ## college chem

A balloon is filled with 2.3 cm3 helium gas at 112.1 atm pressure. What will be the new pressure (atm) if the volume is changed to 44.7 cm3? P1V1=P2V2 (112.1)(.0023)=(P2)(.0447) the answer i got was 54.85 so would the answer be 54.85 atm?

a soccer ball is kicked with an initial velocity of 5.0 m/s in a direction of 30 degrees above the horizontal a. what are the initial components of the velocity? vix= viy= b. what are the components of the veloicty just before the ball hits the ground? vx=

343. ## college algebra

Shondra wants to enclose a rectangular garnden with 240 yards of fencing. What dimensions for the garden will maximize its area?

344. ## chem

The study of kinetics group 1: Temp: 12.6 C T(K): 12.6+273= 285.6 1/T(K): 3.50X10^-3 this one is the x value Time: 816 sec Rate ®: 7.66 x10^-6 LnR: -11.8 this is the y value group 2: Temp: 45C T(K): 45+273= 318 1/T(K): 3.14X10^-3 this one is the x value

345. ## Grammar

Would it make sense to write : uphold a status quo of Africans

clue using these unscramble letter: UNGGGIEMANM answer the clue question NASTY FACIAL EXPRSSION. The answer has two words. First word has four letters and the second word has seven letter. Two word answer.

(e^x + e^-x)/2=1

348. ## PHYSICS

How fast is 65 mph in meters per seconds? (i just need the answer) thanks very much

asked by *Krista (its just a simple question on converting)
349. ## Correct or not correct?:)

1. 5 1/3 + 3 2/3 = 8 3/3? 2. 8 1/5 + 4 3/10 = 12 1/2

350. ## Physics - Coulombs Law

Two identical objects have charges 6.0*10^-6 and -2.0*10^-6 respectively. When placed a distance d apart, their force of attraction is 2.0N If the objects touched together, then moved to a distance of separation of 2d, what will be the new force between

351. ## economics

what would happen to the consumer spending and on the unempolymentrate if the U.S government were to increase personal income tax rates

352. ## english

act 1 secne 4 romeo and rosaline act 2 secne 1 Mercutio is foil for romeo act 1 secne 1 benvolio and tybalt

353. ## math

how many times does a wheel turn in travelling 3km if a circumfrence of a wheel is 2m?

354. ## physics

does each of the two lenses used in a microscope produce a magnification of the object being viewed?

355. ## Physics

A car (mass 880 kg) is traveling with a speed of 44 mi/h. A bug (mass 7.9 mg) is traveling in the opposite direction. What speed would the bug need in order to slow down the truck by one mile per hour in a big bug splash (i.e., final speed 43 mi/h)? I

356. ## math

show that the curves y=2x^2+5x y=x^2+4x+12 y=3x^2+4x-6 have one point in common and find coordinates??

357. ## Computer Science

We are using Netbeans IDE for my class and i have no clue on how to write this program... Write a program to enter a score and a points possible for a test, computer the percent, display the percent to 1 decimal place and then display the letter grade (A

358. ## physics

A 7.0-g bullet is fired into a 1.5-kg ballistic pendulum. The bullet emerges from the block with a speed of 200 m/s, and the block rises to a maximum height of 12.3 cm. Find the initial speed of the bullet?

359. ## Algebra

Please let me know if I simplified this correctly. Simplify: -5w squared + 23-(29-4w squared +9) -5w squrd + 23 - 29 + 4w squrd -9 -1w to the fourth power + -15 Thanks!!!

360. ## Computer Visual Basics 2008

This questions is from Chapter 5, #54) Write a program to compute tips for services rendered. The program should request th person's occupation, the amount of the bill, and the percentage tip as input and pass this informaiton to a Sub procedure to display

361. ## physics

An unbanked curve has a radius of curvature of 75m. On a winter day, with snow on the road, the coefficient of static friction between the tires of the car and the road is .23. What is the maximum speed with which the car can safely negotiate the curve?

362. ## Mathmetics got the answer just need steps!

Steeeeepz for 9 8\15 Plus 11 5\12

363. ## economics

For anyone with experience working with game theories... 1.) Two animals are fighting over some prey. Each can be passive or aggressive. Each prefers to be aggressive if its opponent is passive, and passive if its opponent is aggressive; given its own

364. ## chemistry

What is the specific heat capacity of lead if a 18.9 g sample increased 12.9 C upon the addition of 31.5 J? The units are J/(gK)

365. ## Math

can you help me on this problem? -15-(-4)+(-1)

366. ## technology

Why computers manufacturers constantly are taking out computers more faster?

367. ## math

2X^2+3X+1 d^2+8d+7 2a^2+5a+3 3x^2-x-4 2n^2+n-6 x^2+5x-14 5x^2-2x-7 7n^2+9n+2 3x^2+8x+4 7a^2-30a+8

asked by factoring! help! urgent!! :(
368. ## physics

you are a pilot on an aircraft carrier. you must fly to another aircraft carrier, now 1,450km at 45 degres of your position, moving at 56 km/h due east. the wind is blowing from the south at 72 km/h. calculate the heading and air speed needed to reach the

369. ## Physics

A 1.80 kg block slides on a frictionless horizontal surface. The block hits a spring with a speed of 2.00 m/s and compresses it a distance of 11.0 cm before coming to rest. What is the force constant of the spring?

370. ## statistics

The heights of a large population of students have a mean of 60" with a standard deviation of 3". What is the mean of the resulting distribution of sample means for n =16?

371. ## algebra

sarah has dimes and nickels which total \$1.65. the number of nickels she has is 3 less than the number of dimes. how many of each does she have?

372. ## Math

Hi everyone! May anyone please tell me how to tell how many zeroe's are required in your answer when moving the decimal points in converting metric units? Thank you very much! PLease help son, if possible, as I have a really big test coming up!

373. ## Physics

What physical phenomenom might produce emission spectra?

374. ## algebra

two planes take off from an airport at the same time and head in opposite directions at 260mph and 275mph respectively. in how many hours will they be 1605 miles apart?

375. ## Chemistry

What is the maximum weight (in grams) that 15 party balloons, each filled with 2 L of helium, can lift at STP? You can assume the weight of the balloon rubber is negligible and the outside air can be treated as pure nitrogen.

376. ## Chemistry

Given one of the following solution: 50.00mL of 0.10M of K2CrO4 answer the following. 1. How do you prepare the solution? 2. What volume (mL) of your solution contains 5.00X10(-4) moles of the solute? 3. What volume of your solution contains 1.00g of the

377. ## CHEMISTRY

A student needed to standardize a solution of NaOH which was approximately 0.125 M. The student carefully prepared the titration setup, but after 25 mL of NaOH was added, what was the pH of solution if initially flask contains 25 mL of 0.250 M HCl

378. ## maths

v = ax pie squared find the sqaure root

379. ## physiology

If the mean P-Q interval voltage is 1mV, and the peak of the R wave for lead I and III are 2mV and 5mV, what are the true values for R wave amplitude in these leads? a. 2 & 4mV b. 2 & 5mV c. 1 & 4mV d. 1 &7mV e. 1 & 5mV

i am inside the path numbers 7,6,9,3 i am the difference of 2 numbers outside the path 7,6,9,3,what number am i

381. ## Math

Factor each expression 1-9a^2/a+1 times 4x^2-y^2/x+y Here is what I got: (1-3a)(1+3a)/a+1 times (2x-y)(2x+y)/x+y what am i doing wrong? The final answer is suppose to be 1-3a

382. ## micro economic

The sales tax rate applied to all purchases within a state was 0.04 (4 percent) throughout 2006 but increased to 0.05 (5 percent) during all of 2007. The state government collected all taxes due, but its tax revenues were equal to \$40 million each year.

383. ## Physics

A rectangle has a length of 2d and a height of d. Each of the following three charges is located at a corner of the rectangle: +q1 (upper left corner), +q2 (lower right corner), and -q (lower left corner). The net electric field at the (empty) upper right

384. ## US History

I need help answering this: Historians have used the terms "robber barons" and "captains of industry" to describe the powerful industrialists of the late 1800s. Compare the two points of view reflected by these terms and which do you think is more

385. ## computer science

How would you write this program? We are using Java in Netbeans IDE.. Write a program to enter the year (ex 2004) and month number (1-12) then compute the number of days in that month. Example Enter the Year: 2004 Enter the Month: 2 There are 29 days in

386. ## Math

how would you factor this expresssion I'm so confused. Thank you x^3-4x^2+3x/x+2 times (x^2-3x)

a 65kg diver jumps off of a 10m tower. find the diver´s velocity when he hits the water?

388. ## Science

What are two potential hazards with oil use?

390. ## Food

What are the exact chemicals found in raw ground beef?

392. ## Biology

If there are 12 chromosomes in an animal cell in interphase of the cell cycle, what is the diploid number of chromosomes for this organism? A) 6 B) 24 C) 36 D) 12 E) 48

393. ## human geography

discuss quota systems-what is it, why? purpose? is it still in effect? what forms?

394. ## Quadratic and exponential sequences

I need to set up a chart to find the 6th and nth terms in this sequence - and soleve for the rule or process. here's the sequence: 1,3,9,27,81 Thanks!

Identify the pronouns in each sentence. Then decide if each is nominative (N), objective (O), or possessive (P). Write your answer according to the following example: Q: My favorite actor is better than yours. A: My; P, yours; P 1. Why wasn't he invited to