# Questions Asked onOctober 7, 2010

1. ## Physics.

An unmarked police car traveling a constant 95 km/h is passed by a speeder traveling 120 km/h. Precisely 1.00 sec. after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 1.90 m/s^2 , how much time passes

2. ## Physics

My problem question: "A ball is thrown up onto a roof, landing 4.0 seconds later at a height of 20.0 m above where it was thrown. The ball's velocity vector upon landing on the roof top was angled 60 degrees to the horizontal flat roof top. Find the

3. ## physics

A block of ice of mass 4.10 kg is placed against a horizontal spring that has force constant k = 210 N/m and is compressed a distance 2.60×10−2 m. The spring is released and accelerates the block along a horizontal surface. You can ignore friction and

4. ## Chemistry

How many moles of n2 are needed to react with 0.500 mol of lithium

5. ## home economics

Consider the following events: Scientists reveal that consumption of oranges decreases the risk of diabetes and, at the same time, farmers use a new fertilizer that makes orange trees more productive. Illustrate and explain what effect these change have on

6. ## math

A ladder 10 ft long rests against a vertical wall. let θ be the angle between the top of the ladder and the wall and let x be the distance from the bottom of the ladder to the wall. If the bottom of the ladder slides away from the wall, how fast does x

7. ## Chem

Identify the Oxidizing agent and the reducing agent for Al(s)+3Ag^+(aq)--->Al^3+(aq)+3Ag(s) Express your answers as chemical formulas serperated by a comma. I tried putting in Al,3Ag^+ and 3Ag,Al^3+ I keep getting it wrong and only have one attempt left I

8. ## College Chemistry

The Cu2+ ions in this experiment are produced by the reaction of 1.0 g copper turnings with excess nitric acid. How many moles of Cu2+ are produced?

9. ## Chemistry

He is the lightest noble gas component of air, and Xe is the heaviest. Perform the following calculations, using R=8.314J/(molXK)and M in kg/mol. 1. Find the average kinetic energy per mole of He and Xe at 30 degrees C. 2. Find the average kinetic energy

10. ## physics

an astronaut standing on a platform on the moon drops a hammer. if the hammer falls 6.0 meters vertically in 2.7 seconds, what os its acceleration.

11. ## physics

Consider two closed systems A and B. System A contains 3000 kJ of thermal energy at 20°C, whereas system B contains 200 kJ of thermal energy at 50°C. Now the systems are brought into contact with each other. Determine the direction of any heat transfer

12. ## English

There are 8 word cards on the blackboard. On one side there are English words, and on the other side, there are Korean words. You see English words on the cards now.... I will turn the cards over then you can see Korean words. I have turned over the cards.

13. ## Pre-AP Chemistry

Volume (cm3 Area(cm2) Thickness (cm) .20 cm3 100 cm2 0.002 cm .28 cm3 122 cm2 0.002 cm .24 cm3 144 cm2 0.017 cm .41 cm3 225 cm2 0.0018cm If you had used a very crude balance that allowed only one significant figure, how would this have affected your

A firefighter stood on the middle rungs of a ladder ,spraying water on a burning house. He then climbed up 6 rungs before the heat of the flames caused him to come down 10 rungs.After some minutes he was able to climb 18 rungs to the very top of ladder

15. ## math

Juan says, "When you put together unequal groups, you can only add." Is he correct?

16. ## Chemistry

The ΔH per mole of CaCl2 is -81.0 kJ. Calculate the final temperature of an aqueous solution if 30 g of CaCl2 are added to 100 g of water at 23oC. Assume that the specific heat of the solution is the same as that of water

17. ## Chemistry :(

Disulfur dichloride, S2Cl2, is used to vulcanize rubber. It can be made by treating molten sulfur with gaseous chlorine: S8(l) + 4 Cl2(g) --> 4 S2Cl2(l) [Molar masses: 256.6 70.91 135.0] Starting with a mixture of 32.0 g of sulfur and 71.0 g of Cl2, which

18. ## Chem

Could someone please walk me through step by step on how to do this. Propane (C3H8) burns in oxygen to produce carbon dioxide and water. C3H8(g) + 5 O2(g) 3 CO2(g) + 4 H2O(g) Calculate the mass of CO2 that can be produced if the reaction of 48.2 g propane

19. ## chemistry

Your body deals with excess nitrogen by excreting it in the form of urea, NH2CONH2. The reaction producing it is the combination of arginine (C6H14N4O2) with water to give urea and ornithine (C5H12N2O2). C6H14N4O2 + H2O  NH2CONH2 + C5H12N2O2 [Molar

20. ## math

Obtain exponential functions in the form f(t) = Aert, if f(t) is the value after t years of a \$9,000 investment depreciating continuously at an annual rate of 8.5%. f(t) = 1

21. ## statistics

12 light bulbs are tested to see if they last as long as claimed. 3 of them fail. 2 light bulbs are selected at random without replacement. find the probablility that at least one of the 2 selected failed the test.

22. ## Chemistry

If you take a 10.0-{mL} portion of the stock solution and dilute it to a total volume of 0.700 L, what will be the concentration of the final solution?

23. ## physics

Consider two identical rooms, one with a refrigerator in it and the other without one. If all the doors and windows are closed, will the room that contains the refrigerator be cooler or warmer than the other room? Why?

24. ## calculus

A ladder 10 ft long rests against a vertical wall. let θ be the angle between the top of the ladder and the wall and let x be the distance from the bottom of the ladder to the wall. If the bottom of the ladder slides away from the wall, how fast does x

25. ## Chemistry

The reaction of methane and water is one way to prepare hydrogen: CH4(g) + H2O(g) --> CO(g) + 3 H2(g) [Molar masses: 16.04 18.02 28.01 2.02] If you begin with 995 g of CH4 and 2510 g of water, what is the maximum possible yield of H2?

26. ## Chemistry

Aqueous sulfurous acid (H2SO3) was made by dissolving .200L of sulfur dioxide gas at 19 degrees C and 745 mmHg in water to yield 500mL of solution. the acid solution required 12mL of sodium hydroxide solution to reach the titration end point. what was the

27. ## physics

A 747 jet, travelling at a speed of 70 m/s, touches down on a runway. The jet slows to rest at the rate of 2.0 m/s^2. Calculate the total distance the jet travels on the runway as it is brought to rest.

28. ## Ohlone

how many moles of oxygen are consumed in burning 1.6 moles of benzene, C6H6?

29. ## 3rd grade math (array)

Ray makes an array that has 4 rows of 4 counters. He wants to make two more arrays using the same number of counters. He wants more than one counter in each row. What two arrays can he make?

30. ## math

A bacteria culture starts with 1,000 bacteria and doubles in size every 2 hours. Find an exponential model for the size of the culture as a function of time t in hours.

31. ## chemistry

What is the frequency of a photon resulting from the transition of n = 7 ¨ n = 1 ?

32. ## Chemistry

write balance chemical equation for gaseous hydrogen gas to form gaseous methane ch4 and liquid water.

33. ## Physics

A hockey puck with mass 0.237 kg traveling along the blue line (a blue-colored straight line on the ice in a hockey rink) at 1.4 m/s strikes a stationary puck with the same mass. The first puck exits the collision in a direction that is 30° away from the

34. ## chemistry

an iron ore contains 50.0% Fe2O3. How many grams of pure iron could be contained from 200 grams of this ore?

35. ## College Chemistry

how many grams of metallic copper are required to react with the number of moles of Cu2+ , 0.16mol, to form CuCl overall reaction can be taken as: Cu2+(aq) + 2 Cl- (aq) + Cu(s)-->2CuCl(s)

36. ## Chemistry

What is the specific heat (in cal) of fat with a degree change from 25 degrees Celsius to 35 degrees celsius? Density of fat = 0.94 g/cm^3

37. ## physics

An elevator and its load have a combined mass of 1700 kg. Find the tension in the supporting cable when the elevator, originally moving downward at 13 m/s, is brought to rest with constant acceleration in a distance of 43 m.

38. ## Physics

The boy on the tower of height h = 20 m in the figure below throws a ball a horizontal distance of x = 56 m. At what speed, in m/s, is the ball thrown?

39. ## Chemistry

Find the average kinetic energy per molecule of He at 30 degrees C

40. ## college

A farmer planted a field of Bt 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 22 ears in 1/1000 of an acre. He determines that each ear has about 700 kernels on average. He also knows that a bushel contains about 90 000

41. ## economics

Studies indicate that the price elasticity of demand for cigarettes is about 0.4. If a pack of cigarettes currently costs \$4 and the government wants to reduce smoking by 20 per cent, by how much should it increase the price? Show your calculations. (b) If

42. ## math

A stone is thrown straight up from the edge of a roof, 700 feet above the ground, at a speed of 10 feet per second. (A). Remembering that the acceleration due to gravity is -32 feet per second squared, how high is the stone 2 seconds later? Don't forget to

43. ## PHYSICS

1.Suppose you wish to whirl a pail full of water in a vertical circle without spilling any of its contents. If your arm is 0.99 m long (from shoulder to fist) and the distance from the handle to the surface of the water is 20.5 cm, what minimum speed is

44. ## algebra 2

Write the inequality in the space provided and graph it on the grid. a.I am not in the second quadrant. b.One point on my border is (-2,-1) It is not one of my solutions c. My border is a horizontal line

A price (in dollars) and demand for a product are related by 2x^2-5xp+50p^2=21200 If the price is increasing at a rate of 2 dollars per month when the price is 20 dollars, find the rate of change of the demand. Rate of change of demand =

46. ## Math

Correct the error in this equation: 6(2y+6)=4(9+3y) 12y+36=36+12y 12y=12y 0=0 y=0

47. ## Physics

A 6-kg clay ball is thrown directly against a perpendicular brick wall at a velocity of 22 m/s and shatters into three pieces, which all fly backward, as shown in the figure. The wall exerts a force on the ball of 2430 N for 0.1 s. One piece of mass 2 kg

48. ## physics

A cat climbs 20 m directly up a tree. What is the horizontal component of the cat’s displacement? Answer in units of m.

49. ## math

After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.

50. ## Physics

a woman on a bridge 75 high sees a raft floating at a constant speed on the river below.

51. ## Chemistry

A baker uses sodium hydrogen carbonate as the leavening agent in a banana nut quickbread. the baking soda decomposes according to two possible reactions. 1. 2 NaHCO3 = Na2CO3+H2O+CO2 2. NaHCO3+H=H2O+CO2+Na. calculate the volume in mL of CO2 that forms at

52. ## Algebra 2

1. During 60mi of city driving, Jenna averaged 15mi/gal. She then drove 140mi on an expressway and averaged 25mi/gal for the entire 200mi. Find the average fuel consumption on the expressway. 2. The excursion boat Holiday travels 35km upstream and then

53. ## social studies

cortes had several advantages in defeating the Aztecs metal_______;________a kind of rifle. ________ that could easily pierce the cloth suits the Aztecs wore.______that frightened the Aztecs _________ or friends who will help in a fight

54. ## math

round to the nearest thousand, nearest hundred, nearest ten 8999

55. ## physics

A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 25.0° below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a

56. ## algebra 2

a.I am not in the second quadrant. b.One point on my border is (-2,-1) It is not one of my solutions c. My border is a horizontal line

57. ## physics

A particle that hangs from a spring oscillates with an angular frequency ω. The spring-particle system is suspended from the ceiling of an elevator car and hangs motionless (relative to the elevator car) as the car descends at a constant speed v. The car

58. ## math

how can you use rounding to estimate 331+193

59. ## Chem

Which of the following pairs of elements are likely to form an ionic compound? lithium and chlorine sodium and potassium phosphorus and chlorine sodium and nitrogen argon and potassium

60. ## Intermediate Algebra

Determine whether the point (1, 8) is a solution of the system 2x + 6y = 50 10x + 0y = 10 by substituting the point into each equation. So far I have: 2x=6y=50 y=50-2x 10x+10y=10 10x+0(50-2x)=10 10x+0=10 x=10 y=50-2x y=50-2(1) y=50-2 y=48 PLEASE HELP! I'm

61. ## math

Round to the nearest thousand, nearest hundred, and the nearest ten 7509

62. ## stats

There are four major political parties in the country Treon. A public research group is interested in finding out whether there is any relationship between the party that is supported by a citizen of Treon and that citizen's socio-economic status. For the

63. ## Chemistry

How many moles of HNO3 are present in 35.0 mL of a 2.60 M solution of nitric acid?

64. ## Chemistry

In the Haber-Bosch process, nitrogen and hydrogen gas are reacted under high temperature 500 degrees C and pressure 200 atm to form ammonia gas (NH3) according to the following equation: N2+3H2 = 2NH3 If 9300 L H2 gas is reacted with an excess of N2 gas at

65. ## Math

Is it possible to bend a 20cm length of wire into the shape of a rectangle which has an area f 30cm^2? I don't know how to approach this at all.

66. ## Math

An open box contains 80cm^3 and is made from a square piece of tinplate with 3cm squares cut from each of its four corners. Find the dimensions of the original piece of tinplate. A=80 A=(length)(width)(height) since length and width are the same, and when

67. ## Math

Letter Addition I am given xyz+ab=cdef and xyz-ab=bga How do I solve this?

68. ## physics

A crate of mass m = 230 kg is pushed at constant speed up the frictionless ramp (θ = 29.0°) by a horizontal force F. What is the magnitude of F?

69. ## Math

An open box contains 80cm^3 and is made from a square piece of tinplate with 3cm squares cut from each of its four corners. Find the dimensions of the original piece of tinplate. A=80 A=(length)(width)(height) since length and width are the same, and when

70. ## Organic Chemistry

2 methyl-2-propanol is treated with 9M H2S04. What is the mystery product?

71. ## geometry

find the surface area of a right prism with the given features: The bases are trapezoids with bases of lengths 6 and 10 perpendicular to one side of the length 12 ; height = 12 Round the answer to the nearest square unit

72. ## Chemistry

You have a stock solution of 16.0 M {{NH}}3. How many milliliters of this solution should you dilute to make 1500 mL of 0.200 M {{NH}}3?

73. ## Chemistry

How many milliliters of 0.135 M HCl are needed to completely neutralize 56.0 mL of 0.101 M Ba(OH)2 solution?

74. ## Math

This is the question: a certain factory makes bikes and trikes. Seats come in boxes of six. The workers hate to have any leftovers at the end of their shift. If 59 wheels have been sent by the home office, how many boxes of seats should be ordered?

75. ## chemistry

Not sure how to do any of this. Please help!!! A sample of the compound prepared in this experiment, weighing .1021g, is dissolved in HNO3 and diluted to a volume of 100mL. A 10mL aliquot of that solution is mixed iwth 10mL 6 M NH3. The [Cu(NH3)4 2+] in

76. ## Physics

A billiard ball of mass m = 0.250 kg hits the cushion of a billiard table at an angle of θ1 = 63.4° at a speed of v1 = 24.8 m/s. It bounces off at an angle of θ2 = 71.0° and a speed of v2 = 10.0 m/s. (a) What is the magnitude of the change in momentum

77. ## Physics

A toy rocket is launched upwards from rest. The rocket engine will cause the rocket to accelerate at 25 m/s^2 for 3.0 seconds. a) How fast is the rocket moving aft the end of the 3 seconds? b) What is the maximum height reached by the rocket? c) What is

78. ## English

1. You are a girl aged between 13 and 19 years old. (Which one is missing between 'girl' and 'aged'? is #1 from #2?) 2. You are a girl who is aged between 13 and 19 years old.

Mrs. Jones had some white paint and some green paint, and a bunch of wooden cubes. Her class decided to paint the cubes by making each face either solid white or green. Juan painted his cube with all 6 faces white - Julie painted her cube solid green.

80. ## Chemistry

A sample of unknown gas effuses in 10.6 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.42 min. What is the molar mass of the unknown gas?

81. ## Chemistry

A baker uses sodium hydrogen carbonate as the leavening agent in a banana nut quickbread. the baking soda decomposes according to two possible reactions. 1. 2 NaHCO3 = Na2CO3+H2O+CO2 2. NaHCO3+H=H2O+CO2+Na. calculate the volume in mL of CO2 that forms at

82. ## Chemistry

What variable always appears in any reaction rate calculation? Would that be time?~seconds/s?

83. ## Physics

A figure skater is spinning with her arms out wide. Will she spin faster or slower if she tucks in her arms? Why?

84. ## math

After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.

85. ## transportation

Hello, it's AL again. I wonder if commercial airplanes for travellers can possibly use an alternative fuel in the future for flying.

86. ## Physics

Once a favorite playground sport, dodgeball is becoming increasingly popular among adults of all ages who want to stay in shape and who even form organized leagues. Gutball is a less popular variant of dodgeball in which players are allowed to bring their

87. ## phy

A ball of mass 0.540 kg moving east (+x direction) with a speed of 3.30 m/s collides head-on with a 0.740 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each ball after the collision? a)ball originally at

88. ## algebra

Ann is five years older than twice her brother Dan's age, a. Write an algebraic expression to represent the sum od their ages.

89. ## math

After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.

90. ## Social Studies

1. Scholars have done the least study into the political influence of _____ on American citizens. a. churches b. families c. schools d. media e. peers 2. The process of political learning in the United States is a. normally cumulative; political beliefs

91. ## chem

What is the structure of the addition polymer that results from polymerization of 2-chloropropene.

92. ## Physics

One gram of water is placed in a cylinder and the pressure is maintained at 2.0 x 105 Pa. The temperature of the water is raised by 31oC. Determine the change in internal energy when, a) the water is in its liquid phase and causes an expansion of 1.0 x

93. ## Vocabulary

Need help with the fill in the blank vocabulary

94. ## college math 116

Functions are a lot like equations. In a function we look at the relationship of the variables. Does one variable depend on the other. In a function when you see f(x) it just means "y." So we have an equation y = 2x + 3 and a function that is f(x) = 2x +

95. ## chemistry

Describe how you would weigh your KHP samples, if you didn’t know about weighing by differences. Mentioning any differences between your method and the method we made you use, explain why we use the technique of weighing by difference.

96. ## Science

Use diffusion to explain what happens when you drop a sugar cube into a mug of hot tea

97. ## Chemistry

The Ksp of aluminum hydroxide is 5 x 10 -33.At what ph foes Al(OH)3 just begin to precipitate in a 0.15M solution of AlCl3?

98. ## Math

Find the requested function and state its domain: f(x)= 4x+3 g(x)=4x-5 Find f/g and its domain. So I did 4x+3/4x-5, so the 4x's cancel out and 3/-5 is left. So my answer is 3/-5. Is this correct Now I just need to find the domain which I am not to sure

99. ## Chemistry

Calculate the pH, to one decimal place, of the solution made by mixing 21.0 mL of 0.33 M HNO3 with 121.0 mL of 0.32 M formic acid (HCOOH)

100. ## physics

A cat climbs 20 m directly up a tree. What is the horizontal component of the cat’s displacement? Answer in units of m.

101. ## Chemistry

A sample of magnesium metal reacts with hydrochloric acid solution to produce magnsesium chloride solution and hydrogen gas. a)write a balanced chemical equation for this reaction and include phase designations. The phase designations would be s for solid,

102. ## physics

A startled armadillo leaps upward, rising 0.596 m in the first 0.190 s. (a) What is its initial speed as it leaves the ground? (b) What is its speed at the height of 0.596 m? (c) How much higher does it go?

103. ## CALCULUS!!!

A price (in dollars) and demand for a product are related by If the price is increasing at a rate of 2 dollars per month when the price is 20 dollars, find the rate of change of the demand. Rate of change of demand =

104. ## Chemistry

A sample of magnesium metal reacts with hydrochloric acid solution to produce magnsesium chloride solution and hydrogen gas. a)write a balanced chemical equation for this reaction and include phase designations. The phase designations would be s for solid,

105. ## Physics

For this problem, ignore air resistance. You are to fire a rifle that shoots a particular bullet at 460 m/s at a target that is 45.7 m away and level with the rifle. Assuming that the acceleration due to gravity is 9.80 m/s², how high above the target

106. ## economics

qs=-400+2p qd=1600-2p how do i graph that

107. ## physics

An object is thrown vertically upward with a speed of 22.4 m/s. How high does it rise?

how many boxes con you find that will hold two times as many cubes as a 2 by 3 by 4 box.

109. ## Physics

The boy on the tower of height h = 20 m in the figure below throws a ball a horizontal distance of x = 56 m. At what speed, in m/s, is the ball thrown?

110. ## Physics

The boy on the tower of height h = 20 m in the figure below throws a ball a horizontal distance of x = 56 m. At what speed, in m/s, is the ball thrown?

Make a tally chart for the number of students in the third, fourth, and fifth grade classes: 26,25,27,27,26,28,27

112. ## Chemistry

Calculate the molarity of a solution made by dissolving 0.680 grams of Na2SO4 in enough water to form exactly 940 mL of solution. Please show me how to solve

113. ## College Chemistry

what is the maximum weight of CuCl that can be prepared from the reaction sequence using 1.0g of Cu turnings to prepare the Cu2+ solution?

114. ## Physics

A car of mass 1100 kg, moving with a speed of 73 mph on a highway, passes a small SUV with a mass 1 1 2 times bigger, moving at 1/2 of the speed of the car. (a) What is the ratio of the momentum of the SUV to that of the car? pSUV pcar = 1 (b) What is the

115. ## physics

A stopper tied to the end of a string is swung in a horizontal circle. If the mass of the stopper is 13.0 g, and the string is 93.0 cm, and the stopper revolves at a constant speed 10 times in 11.8s?

116. ## Discreet Mathematical Structures

Use proof by contraposition to prove the following statement: If A is the average of two positive real numbers then one of the two numbers is greater than or equal to A. Proof. Domain: positive real numbers P: A=(x+y)/2 Q: x is greater than or equal to A

117. ## physics

A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 25.0° below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a

118. ## Chemistry

What variable always appears in any reaction rate calculation? Would that be time?~seconds/s?

119. ## Chemistry!

Experiment on Which Fuels Provide the Most Heat? Comparison of the Energy Content of Fuels. Suppose you put 50 mL of water in the can instead of 100 mL and heated it 40 degrees instead of 20 degrees. In what ways, if any, would this affect the results of

Mr.Jones wants to put tiles on the floor by the front door of his house. He wants to use 3 different colors of tiles in his design. one half of the tiles to be blue, one fourth of the tiles to be gray, and one fourth of the tiles to be red. I need to use a

121. ## Math

Is it possible to bend a 20cm length of wire into the shape of a rectangle which has an area f 30cm^2? I have no idea how to even approach this. Please give me some guidance?

122. ## physics

An object is thrown vertically upward with a speed of 22.4 m/s. How high does it rise?

123. ## Pre-AP Chemistry

What method would be used to determine the thickness of an oil spill? What information would be needed? Please be specific. I need help FAST

124. ## calculus

lim f(x) sin 3x / x x¨0

125. ## English

Here are some sentences on Shakespeare I'd like you to check. Thank you. 1)It is difficult to date Shakespeare's plays because only half of them were printed during his lifetime. Three kinds of evidence are used (?) to date his plays. 2) The most valuable

126. ## physics

what is the speed of a ball after it has fallen freely from rest through a distance of 12 meters

127. ## chemistry

I need to calculate the density, with work shown. 50.0 mg of a gas which occupies a volume of 0.0064 L ?

128. ## World Literature

After reading Gilgamesh, Genesis, and Metamorphoses, what are the major similarities and differences in the stories?

129. ## Alg. 1

Marla begins to walk at 3 mph toward the library. Her friend meets her at the halfway point and drives her the rest of the way. the distance of the library is 4 miles. how many hours did marla walk?

130. ## Physics

One gram of water is placed in a cylinder and the pressure is maintained at 2.0 x 105 Pa. The temperature of the water is raised by 31oC. Determine the change in internal energy when, a) the water is in its liquid phase and causes an expansion of 1.0 x

131. ## Chemistry

How many moles of KMnO4 are present in 300 mL of a 4.90×10−2 M solution?

132. ## AP CHEM

19. Burning coal and oil in a power plant produces pollutants such as sulfur dioxide, SO2. The sulfur-containing compound can be removed from other waste gases, however, by the following reaction: 2 SO2(g) + 2 CaCO3(s) + O2(g)  2 CaSO4(s) + 2 CO2(g)

133. ## Physics

Block A and block B (see figure below) are forced together, compressing a spring (with spring constant k = 2220 N/m) between them 2 cm from its equilibrium length. The spring, which has negligible mass, is not fastened to either block and drops to the

134. ## Physics

I have this problem about drawing graphs. For the following 6 situations, sketch a graph of velocity vs. time. A cart is moving to the right on a horizontal surface while a constant net force of 3 newtons acts on it to the left> The force acting on the

135. ## chemistry

how do I solve E = hc/lambda

136. ## Math

Find the requested function and state its domain: f(x)= 4x+3 g(x)=4x-5 Find f/g and its domain. So I did 4x+3/4x-5, so the 4x's cancel out and 3/-5 is left. So my answer is 3/-5. Is this correct Now I just need to find the domain which I am not to sure

137. ## math

So I've been having trouble solving some problems. Mainly problems that look like this 5-(t+3)=-1+2(t-3) what causes problems is the 5- part. I asked my teacher for help, and he gave me a hint, which is to distribute a -1 like 5+(-1)(t)+(-1)(3) But I still

138. ## stats

How many students must we sample if we want to be within 4% of the true proportion of female students at DeVry University when using a 95% confidence interval? I was told last night that there would be an answer in a couple of hours??????????????????????

139. ## physics

A car starts from rest and accelerates uniformly over a time of 6.5 seconds for a distance of 150 m. Determine the acceleration of the car.

140. ## Taking notes

What are some of the steps…. taking notes while preparing for a outline, introduction, etc.? ****I HAVE ONE AND NEED SOME HELP. I WOULD ALSO LIKE TO BE SURE I AM ON THE RIGHT TRACK WITH TH EONE I HAVE SO FAR**** 1. For best results, take notes in the

141. ## algebra

A book has N consecutive pages torn out. Suppose A is the last numbered page before the torn out section and B is the forst numbered page following the torn out section. Fins the formula for N in terms of A and B * Each paper in the book has 2 sides. Each

142. ## chemistry

on a particularly hot 30 degrees C day near the seashore the partial pressure of water vapor in the air is .0303atm. given that the atmospheric pressure is 1 atm and the composition of dry air is 78% N, 21% O and 1%Ar, what is the partial pressure of

143. ## English

1. He is wearing a plane green jacket. 2. He is wearing a green plane jacket. (Which one is right?)

144. ## PHYSICS

A skier is gliding along at on horizontal, frictionless snow. He suddenly starts down a incline. His speed at the bottom is . What is the length of the incline? How long does it take him to reach the bottom?

145. ## Maths

The sum of three consecutive numbers is 51. Find the largest number. Also write the equation to solve the problem

mason played piano for one hour on monday. on tuesday, he played for 30 minutes longer. On wednesday, he played for 15 minutes longer than tuesday. how long did he play piano on wednesday?

147. ## Math

The materials for each feeder cost \$6, and they sell an average of 20 per week at a price of \$10 each. They conduct a survey and find that for every dollar increase they lose 2 sales per week. Find a function that models weekly profit in terms of price per

148. ## Physics

One gram of water is placed in a cylinder and the pressure is maintained at 2.0 x 105 Pa. The temperature of the water is raised by 31oC. Determine the change in internal energy when, a) the water is in its liquid phase and causes an expansion of 1.0 x

149. ## calculus

The graph of the function y=g(x) is given in the figure above. The x coordinate is (0,-2.) 3. Estimate the x-coordinate of the point where g''(x)=0. Round your answer to one decimal place.

150. ## Chemistry

on a particularly hot 30 degrees C day near the seashore the partial pressure of water vapor in the air is .0303atm. given that the atmospheric pressure is 1 atm and the composition of dry air is 78% N, 21% O and 1%Ar, what is the partial pressure of

151. ## chemistry

What is the effect of the following on the separation of the mixture? a. A soluble, nonvolatile impurity b. a decrease in barometric pressure c. an increase in barometric pressure d. rapid heating rate

Estimate a range for each sum example 7.42+13.97+101.2

153. ## chemistry

caesium+water-->caesium hydroxide caesium+oxygen-->caesium oxide are these equation right?

154. ## physics! center of mass

a long non uniform board of length 8 m and mass m = 12 kg is suspended by two ropes if the tensions in the ropes are mg/3 (on left) and 2mg/3 (on right) what is the location of the board's center of mass thank you!

155. ## Physics

A(n) 4.8 g bullet leaves the muzzle of a rifle with a speed of 345.1 m/s. What constant force is exerted on the bullet while it is traveling down the 0.5 m length of the barrel of the rifle? Answer in units of N.

156. ## Calculus

Find the critical numbers of the function g(t)=|5t-7| If you find g'(t) you just get 5 so would there be no critical numbers? Or am I missing something?

157. ## English AP Lit

any suggestions on the white paper "Things I carry" Am I on the right track. Any add ons The Things I Carry I carry the ability to be independent. The bus arrives at Yosemite and I am feeling apprehensive because I have yet to be away from my parents. I

158. ## physics

You have a friend who is an archer and she wants to know how fast the arrows leave her bow. You have her launch an arrow horizontally, 1.5 m above the ground, and find that the arrow lands 33 m away. What is the initial velocity of the arrow as it leaves

159. ## english

identify the verb,subject in the sentence.a cloud of fruit flies hovered over the banana

160. ## physics

A stopper tied to the end of a string is swung in a horizontal circle. If the mass of the stopper is 13.0 g, and the string is 93.0 cm, and the stopper revolves at a constant speed 10 times in 11.8s?

161. ## science

What are the functions of indicator in acid-base titration?? Thank you!

162. ## Chemistry

A sample of natural gas at STP is 78% CH4 and 22% C2H6 by volume how many moles of each gas are present in 1.60L of the mixture?

163. ## math

Statement: If a number is divisible by 2 and by 3, then it is divisible by 6 and vice versa. Is this statement true? Give an example or counter example.

164. ## chemistry

is the equation of lithium : lithium+water-lithium hydroxide? when it reacts with water?

165. ## stats

IHI insurance is interested in determining whether younger drivers (below the age of 25) are more prone to motor accidents than older drivers (25 or older). A random sample of 68 IHI policyholders below the age of 25 were selected and whether they had been

166. ## us history

how did religion shape the development of colonial society in the Chesapeake?

167. ## Math

Using counters, can you tell me how to make 10 when adding 8 + 5

168. ## science

which is better the projection map or the mercator map and why??

make pu a data set of at least 12 numbers that have the following landmarks maximum 18 mode 7 range 13 median 12

170. ## physics

Hi I have some graph problems I need help on. Sketch a graph of velocity vs. time. A cart is moving to the right on a horizontal surface while a constant net force of 3 newtons acts on it to the left. the force acting on the cart stops after a short period

171. ## Chemistry

The running engine of an automobile produces carbon monoxide (CO), a toxic gas, at the rate of about .102mol CO per minute. a car is left idiling in a poorly ventilated garage that is 60m long, 4 m wide, and 2.2 m high at 20 degrees C. what will the

172. ## math

Use exponential regression to model the price P(t) as a function of time t since 1994. Include a sketch of the points and the regression curve. (Round the coefficients to 3 decimal places.)

173. ## Help! Physics!!

A 120-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 400 N. For the first 17 m the floor is frictionless, and for the next 17 m the coefficient of friction is 0.34. What is the final speed of the crate? Express

174. ## Homonym Sentences

Are these good sentences? I will accept anything you give me as a present, except for money. Sara could not choose between her friends, so she chose Lianna as her partner among the strangers. The teacher told Lianna to sit quietly beside her friend besides

175. ## Criminal Justice

Ms. Singh is a client of your firm. She was recently arrested for breach of peace during an altercation at a bar. Ms. Singh was the recipient of unwanted advances from another patron at the bar. Her boyfriend became jealous and punched the other man. Ms.

176. ## math

how do I solve the equation (y+6) divided by 3- (y-3) divided by2=2

177. ## ALGEBRA!!

calculate P(i) for the following polynomial p(x)=x3+2x2-5x+8 Find | z | for each of the following complex numbers and represent them on a complex plane. a. z=-3-4i b. v=5-12i c.u=7+24i d.w=-9+40i e.p=1+3i f.t=-2i g.n=4 h.m=0 i.s=(√3-i)2

178. ## physics! center of mass

a long non uniform board of length 8 m and mass m = 12 kg is suspended by two ropes if the tensions in the ropes are mg/3 (on left) and 2mg/3 (on right) what is the location of the board's center of mass thank you!

179. ## US History

7. In the Adams-Onis Treaty of 1819, a. the US doubled its size b. the Cherokees settled their dispute with the American government c. Spain ceded Florida to the US d. the US gained the right to build the Erie Canal C? 11. One important result of the

180. ## math

Find equations for exponential functions that pass through the given pair of points. (Round all coefficients to 4 decimal places if necessary.) (-2, 3) and (3, 4)

181. ## science

what properties of sugar change when it is dissolved in water? what properties stay the same

182. ## English

Posted by rfvv on Thursday, October 7, 2010 at 12:07am. 1. You are a girl aged between 13 and 19 years old. (Which one is missing between 'girl' and 'aged'? is #1 from #2?) 2. You are a girl who is aged between 13 and 19 years old. English - MattsRiceBowl,

183. ## Physics

This is my homework problem: "The pilot of a plane is flying at 450 mi/hr W 20.0 degrees S relative to the earth. She sees another plane flying at 350 mi/hr N 40.0 degrees W relative to her plane. What was the magnitude and direction of the plane she saw

184. ## Physics/Calculus

An automobile with a mass of 1316 kg is parked on a moving flatbed railcar; the flatbed is 1.5 m above the ground. The railcar has a mass of 40,810 kg and is moving to the right at a constant speed v = 8.8 m/s on a frictionless rail. The automobile then

185. ## science

More oxygen will ___________ in colder water than in warmer water.

186. ## chemistry

how many milliliters of 3.25 M NaOH would be needed to make 150.0 mL of 1.50 M NaOH?

kevin has a rabbit, a ferret, a gerbel and a turtle. He feeds them in a different different order each day. In how many different orders can Kevin feed his pets?

188. ## Physics

A small rocket is launched vertically, attaining a maximum speed at burnout of 1.0 102 m/s and thereafter coasting straight up to a maximum altitude of 1482 m. Assuming the rocket accelerated uniformly while the engine was on, how long did it fire and how

189. ## calculus

Hi, I am lost on couple of problems and i was wondering if you could just help me out with them. 1. Find and classify the points of discontinuity of the function F(x) = (x^2+7x+12)/(x^3-9x) now for this problem i know there is going to be an infinite

190. ## Calculus ll - Volumes

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified line. y=e^(-x), y=1, x=2; about y=2.

191. ## Chemistry

How many milliliters of 1.40 M KOH solution are needed to provide 0.120 mol of KOH? please explain how to solve

192. ## PHYSICS

A cricket bowler bowls a cricket ball witha mass of 150g and a radius of 52mm. The bowler's arm weighs 3.4kg and has a length of 0.68m. The centre of mass of the bowler's arm act's at it's midpoint. What is the moment of inertia of the cricket ball and

193. ## science

Is this a scientific theory or scientific law? Heating the air in a hot-air balloon causes the balloon to rise.

194. ## chemistry

An ideal solution contains 40 mole % of A and 60 mole % of B at 80 degrees C. The vapor pressure of pure A and B at this temp are 480 torr and 890 torr. Calculate the vapor pressure of the solution.

195. ## science

a 10kg ball is atop a 20m hill. what is the speed when it reaches the bottom how did you get the anwser

196. ## Organic Chemistry

Predict the products Decane + O2 + heat ----->? Show the complete mechanism for each of the following conversions: a) 1-cyclopentene KOH, CHCl3 -----> /\\/Cl l_l/\Cl b) 1-methylcyclopentane Br2 + Heat ------>

197. ## Math

Jason walked 9/10 of a mile. Justin walked 5 3/10 of a mile. What is the difference?

198. ## math-algebra

The Mayan Empire, which ruled Central America for centuries, had two calendars. One calendar was the same as ours, 365 days long (without leap year). The other calendar was 270 days long, the length of a woman's pregnancy. If both start on day one at the

A horizontal spring with k = 70 N/m has one end attached to a wall and the other end free. An 95 g wad of putty is thrown horizontally at 3.4 m/s directly toward the free end. Find the maximum spring compression.

200. ## Chemistry

Experiment 10: Which Fuels provide the most heat? There are many possible sources of error in this experiment. List three that you can think of. Would each error have a large effect, a medium effect, or a small effect on the calculated heat content of a

201. ## algebra

whats five times a number squared?

202. ## science

what type of solution is formed when steam from boiling water evaporates into the air? explain.

203. ## Physics

Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J to a cold reservoir at 0oC. Theoretically, how much maximum work can be produced if the efficiency of the engine is maximized?

205. ## physics

for example of the stone dropped from a ballon and striking the ground and taking into account air resistance sketch a) a distance-time graph b) a velocity-time graph c)an acceleration-time graph

206. ## communication

Which of the following is NOT a question you need to answer to choose a persuasive strategy? A What do you want readers to do? B What points will the audience agree with? C How strong a case can you make? D What kind of persuasion does your organization

For f(x) = 2x-3 and g(x)= 2x^2 find, a) (f + g)(x) = My answer is 2x^2 + 2x - 3. Is this correct? b) (f - g)(x) How would you do this? c) (f X g)(2) I do not know what to do since the 2 is there. Determine whether the graph of the following equation is

208. ## Home work for Gym

To join a gym, your friend pays a one-time fee of \$75 and \$45 per month for the duration of the membership. Your friend has paid a total of \$345. How long has your friend been a member of the gym? HELP ME1 :D

209. ## adverbs and other parts of speech

In the second sentence, the phrase "inside his trouser pockets" is a/an?

210. ## Science

Do pedigrees (specifically animals) typically have a higher, lower, or equal incidence of hereditary disease compared to non-pedigrees?

211. ## algebra

A brick border that is x feet wide is built around a rectangular patio. The patio is 6 feet wide and 8 feet long. The combined area of the patio and the brick border is 120 square feet. What is the width of the brick border?

212. ## chemistry

how many grams are in 2.4 moles of sulfur?

213. ## Health

Bionade is a range of organic fermented and carbonated beverages. Bionade is manufactured in the Bavarian town Ostheim vor der Rhön (Germany) by the Peter beer brewery now owned by Dieter Leipold. (How do you pronounce 'Bionade' Is it German? What is

214. ## math

round to the nearest ten 3,490

215. ## math

I am not sure how to write a fraction as an expression using a negative number for an exponent other than -1? Please help ex: 1/25 and then using a fraction of 1/9to the second power.

Shawn is writing down the family recipes in a cookbook. He has 21 recipes left to write down. He has 3 pages left to fill up. If he wants to put the same number of recipes on every page, how many goes on each?

217. ## algebr7a

can anyone tell me how to use Gaussian Elimination? 3x+2y+4z=19 x+5y+2z=1

218. ## computer science

Write an application that calculates the value of e^x by using the following formula:e^x=1+(x/1!)+(x^2/2!)+(x^3/3!)... Allow the user to enter the number of terms to calculate

219. ## Algebra

10x-4x-5x-2x +2y+6=y Solve for y

220. ## calculus

find an equation of the tangent line to the curve y = x √x that is parallel to the line y = 1 + 3x.

221. ## math 156

The number of students at another university increased from 14,000 students in 1971 to 30,000 in 1975. What was the percent increase in enrollment during this period?

222. ## Physics

I have a golf ballthat is hit for 0.20s at an angle to the horizontal and it hits the ground some distance away. Initial speed is 30m/s and angle of projection is 35. Calculate the time between when the ball was hit and when it first touched down. I think

where can i find a map for ancient egypt 3100 B.C.?

224. ## chemistry

what is the normality of a. above if the density of the solution is 1.02 g/mL

225. ## Law

A man was jogging with his puppy along a busy local street, there was house construction happening near by and the jogger stepped on a fairly large piece of concrete (4 by 3 in) which blended into the sidewalk well that was without a doubt from the

Determine whether the graph of the following equation is symmetric with respect to the x-axis, the y-axis, and the origin. y^2 - x - 49 = 0 For x axis -y^2 - x - 9 = 0 is not the same as the first equation so it is not symmetrical to the x-axis. Correct?

227. ## Math

Solve: 8w-8-6w=4w-7

228. ## literature

in a pair of silk stockings the silk stockings are a symbol of

229. ## physics

if AX = kX, k belongs to reals where A=|4 -2|

230. ## Economics

Compare and contrast the goals of a producer of a health commodity vs. a producer of a non-health commodity.

231. ## Science

Jake was doing a lab to find the density of metal. Here's his data: mass of the metal sample: 45 grams, volume of metal sample: 4.5 mL. Use his data to determine the density of the metal sample. Can you help? I don't get this.

I need to combine like terms. Here are a few questions that I am having trouble with. -r - 10r n-4-9 -4+7(1-3m) Please help ! thank you.

233. ## Chemistry

Predict the empirical formula of the ionic compound, Cs and C. How would I do this? Is it Cs_2C?

234. ## Social Studies

How did european exploration have great imoact in our live????

235. ## Algebra I

A rectangle has a width of 6x+7, a length of 13 How do I get the area?

236. ## social studies

The election of _____ was the only time in American history when the U.S. political system essentially collapsed. a. 1800 b. 1836 c. 1860 d. 1896 e. 1912 I do no know the answer, please tell me where to find it.

237. ## Science

A cricket bowler bowls a cricket ball witha mass of 150g and a radius of 52mm. The bowler's arm weighs 3.4kg and has a length of 0.68m. The centre of mass of the bowler's arm act's at it's midpoint. The moment of inertia of the cricket ball and bowler's

238. ## Math

How many numbers between 1 and 1000 that has the #2 as its only factor

can a solution be made by mixing a solid, liquid and a gas?

240. ## calculus

Find the Taylors series for f (x)=e2x about 0

241. ## Trigonometary

I'm using the sin formula. I've got w over 1.2 and I'm not sure whether I should multiply it out by 1.2 or by w? The formula looks like this sin20 = w/1.2

242. ## Physics

Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J to a cold reservoir at 0oC. Theoretically, how much maximum work can be produced if the efficiency of the engine is maximized?

243. ## communication

You are writing to ask for money for a soup kitchen. Which of the following will BEST avoid having the letter look like a selfish plea for money? A Creating psychological description B Writing thank-you letters to donors C Asking for help at the kitchen

244. ## Chemistry

If a gas has a urms of 425m/s at 25 degrees C, what is the molar mass of the gas?

245. ## Math

Reasoning: What number am I? my tens digit is double my ones digit. I am less than 70 and greater than 60

246. ## science

Is a type of substance that dissolves a --solvent Also, if it is not crystalline--what is it?

247. ## CALC

why is the surface area of a cube not the derivative of a volume?

248. ## math

how do i find the equation for the lines: 1. y-intercept of -2.1, x-intercept of 3.5 2. through (1.2,5.1), x-intercept of 3.7

249. ## math

find the lcd of this rational algebraic expression 4/x+2,2/2-x,3/4-x^2 another rational algebraic expression you will also find the lcd 5/y+5,3y/2y+10,2/y+10

250. ## English Englsih

Please some one check it for me .please please.... Chaucer is a wonderful poet and story teller. His poems are very interesting and deep. Canterbury Tales is a set of stories told by pilgrims. Unconditional love and devotion to religious is a major issue

251. ## English

1. The girl is aged 13. 2. The girl is 13. 3. The girl is 13 years old. 4. The girl is at the age of 13. 5. the girl is at age 13. (Are they all grammatical and the same? Is #1 correct?)

252. ## hcs/430

What function does the judicial system currently serve regarding health care delivery

253. ## math

if AX= kX k belongs to real numbers A=|4 -2| X=|x| |-2 4| |y| and x is not equal to cero, and cero is not equal to y, find k

254. ## US History

Need these checked-- 1. Under popular sovereignty, the decision whether or not to allow slavery in a territory was made by a. Congress b. the voters of the territory c. the Supreme Court d. the President A? 3. The War of 1812 ended with a. a clear victory

255. ## English

Thank you very much for your help. I forgot to include the following sentences. 1) Shakespeare doesn’t give importance to stage directions between acts. In the English theatre there was no curtain fall between the acts 2) As a rule, a Shakespearean play

256. ## calculus

Given that y=sin x ln (x+1),prove that (d^2 y)/(dx^2 )+y=2cosx/(x+1)-sinx/(x+1)^2

257. ## calculus

Find the Taylors series for f (x)=e2x about 0

258. ## chemistry

the boiling point of diphenyl ether is 259 degrees C. It dissolves many nonpolar compounds but it is a poor solvent for crystallization.Why?

What is "h" in 5h+15-3h=32

260. ## physics

Hi I need help to figure out if these situations are possible or impossible thank you. constant velocity, non-zero net force constant speed, non-zero net force velocity to the left, net force to the right decreasing velocity, increasing magnitude of net

261. ## Math

Find all points having x-coordinate 9 and distance 10 from the point (3,-2). Would I use the distance formula here?

262. ## Chemistry

The water from a hydrated magnesium salt is driven off by heat in a closed system. If the steam generated exerts a pressure of 24.8 atm in a 2L container 120 degrees C, determine the number of moles of H2O driven from the compound.

263. ## Math

(x+20)(x-9)(x+10)>0 Please help? I'm stuck...need to find the solution set. so far I have x^3+21x^2-70x-1800>0 am I correct so far? What do I need to do next?

264. ## geometry

M is the midpont ST what is the reason?

265. ## calculus

Suppose F(x)=f(x)g(2x) . If f(1)=3 , fâ€²(1)=3 , g(2)=2 , and gâ€²(2)=7 , find Fâ€²(1). Fâ€²(1)=

266. ## Math

Find the equation for the line with the following. parallel to the line 8x+7y=-7 and containing the point (7,-7) Since it it parallel the equation would have to have 8x, right? Then im not sure what to do.

267. ## Algebra

4(x-2)=7(1+2x) what is x pleas pleas help

268. ## geometry

The lengths of the diagonals of a parallelo- gram are 9.9 feet and 14 feet and they inter- sect at an angle of 39◦.

269. ## algebra

find the lcd o this rational algebraic expression 3x/x-4,2x/x+4

270. ## Law

A man was jogging with his puppy along a busy local street, there was house construction happening near by and the jogger stepped on a fairly large piece of concrete (4 by 3 in) which blended into the sidewalk well that was without a doubt from the

271. ## phy

Find the center of mass of the three mass system that m1 = 1.90 kg and m2 = 1.30 kg. Specify relative to the center of the left hand (1.00 kg) mass.

272. ## writing

Hockenbury and Hockenbury present important information and raise some interesting questions about how daily hassles affect our lives. In a few paragraphs, they present a great deal of information on the subject of daily hassles — what they are, who

273. ## AP Chemistry

Summary of problem Photosynthesis uses CO2 & H20 to make C6H12O2. If a plant has 99 grams of CO2 & 68 grams of H2O for photosynthesis, what's the balanced equation, the mass of glucose made, & the mass of excess?

274. ## calculus1

find dy/dx in terms of x and y if arctan(x^6y)=xy^6

275. ## Europe

do any physical fetures define a border between russia ans the countries of europe

how do i answer this... Write a fraction that represents a ratio of 8 and 9????

277. ## chemistry

How many nutritional Calories does my body use when I consume a glass of 32.0 degree F. ice water, which contains 200. mL of liquid water and 30.0 grams of ice (body temperature 98.6 degree F)

278. ## calculus

find d/dx [cot(sec^3(cos(3x^2-5x+3)))]

279. ## HRM/240

This is my assignment that is due tomorrow. Checkpoint: Job Opportunities Map ·Create a diagram in PowerPoint® or Word mapping job opportunities starting from, or advancing to, the position focused on in your final project. ·Describe the additional

280. ## medicine

The dermatologist is having you prepare a dog for a skin allergy test. Forty antigens need to be tested and each antigen must be 1 cm from the next. What size patch should you shave on the dog (assume that you are shaving a square)

281. ## Biology

Why is damage to skin or muscle usually easily repaired, but damage to the brain or nervous system is not? Thanks.

282. ## Calculus

r(x) =( √x + 9+ √x)^5 Calculate the derivative of the function

283. ## science

Explain in detail the energy transformations and obsorption in the following. Four different colored shirts placed in the sun. All shirts are the same except for color.

284. ## lesson plans

could you direct me to a site that can give written lesson plans foe ibfsnts and toddlers. thanks

285. ## English

1. They wear pink and white stripe uniforms. 2. They wear pink and white striped uniforms. (Which one is OK? Are both OK?) 3. He is wearing a stripe shirt. 4. He is wearing a striped shirt. (What about these sentences? Which one is correct?)

287. ## math

how do you solve t^2+36t=0 Thank you in advance

288. ## US History

How did the federalists and the Jeffersonian republicans differ in their opinion of how the constitution should be interpreted? if a link to a page i can read is provided i'd be extremely grateful otherwise just answer is somewhat fine

289. ## Social Studies

1. Scholars have done the least study into the political influence of _____ on American citizens. a. churches b. families c. schools d. media e. peers 2. The process of political learning in the United States is a. normally cumulative; political beliefs

290. ## Physics

Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J to a cold reservoir at 0oC. Theoretically, how much maximum work can be produced if the efficiency of the engine is maximized?

291. ## math

I need to draw a design for a box that is 2 by 3 by 8 on graph paper.

292. ## English

1. You should dress him up. 2. You should make the baby wear socks. 3. You should have the baby put on the shirt. 4. You should have the baby dressed. (Are they all grammatical? Do we have some more expressions similar to Sentence one?)

293. ## civics/history

who was margarec green draper?

294. ## physics

A 0.30 ball is thrown with a speed of 13 at an angle of 32. What is its speed at its highest point?

295. ## science

What is the process that separates insoluable substances from a liquid. Thank you.

296. ## writing

Alice informs us of ways in which we can reduce our tax obligations in any given year. Based on studies she cited, there were cases in which some tax filers were unaware of various deductions they were eligible to claim. In some cases, those deductions

297. ## math

please get the lcd of this rational algebraic expression 3x+2,2x/x^2-4,x+1/x^2+5x+6

298. ## Help! Physics!!

Water flows (v = approx 0) over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency. Express your answer

299. ## English

Did you do your homework? Yes, I did. It is very easy. 1)It cannot be. It is difficult even for me. (What does 1) it refer to? Do it's in the passage all mean homework?)

300. ## Algebra

one leg of a triangle is 4. Another leg measures 7. If the perimeter of the triangle is 17. What is the length of the other side ?

explain how you know the number that is 1 less than 100

302. ## chemistry

How many milliliters of 0.300 solution are needed to titrate 2.438 of according to the equation below? I_2+2S_2O_3^-2->S_4O_6^-2+2I_-

303. ## writing

Need a thesis for similarities and difference between myspace and facebook.

304. ## Math

The product of two consectuve even numbers is 360. Find the numbers. I tried this: x+(x+2)=360 2x+2=360 x=179, which would mean the numbers are 179 and 181, but those are not even numbers... How am I supposed to solve this?

305. ## chemistry

how many grams of NaOH do you need to prepare a 3.00 x 10^2 mL stock solution of 2.00 M NaOH

306. ## math

Place six coins on the table in the arrangement shown in the first row below... Start like this...head tales head tales head tales Your task is to produce the second arrangement shown by flipping coins according to thsi rule: you must flip two adjacent

307. ## math

3y+6y^3-2y^2+5y^3+5y^2-4y+2

308. ## science

i need to define variable, independent variable, control and control group. HELP!

309. ## math

3y+6y^3-2y^2+5y^3+5y^2-4y+2

310. ## Math

If 30=100%, and going over my subtracts from 100%. What is my percentage if I get 39?

311. ## math

what numbers have both of the given numbers as factors 3 and 5

312. ## U.S. History

Did the following violate or follow the declaration of independence? And also, did the help the market economy or not help? Explain. The Missouri Compromise The Louisiana Purchase The Trail of Tears

313. ## Physics

Consider an inefficient engine which draws 200 J of heat from a hot reservoir at 100oC, converts 48 J to work, and rejects 152 J to a cold reservoir at 0oC. Theoretically, how much maximum work can be produced if the efficiency of the engine is maximized?

314. ## Ag.Science

A married couple both of which are suspected of carring the gene foe Tay Sachs disease is considering having children.What advice would you give them?Give detaled resons for your advice including,but not limited to, possible genotype and phenotype ratios

how would you draw a square with a perimetr 8y?

316. ## Math

Given the function f(x)= x^2-3 / x+1, what point on the graph corresponds to x=-2? I have no idea what to do. Am I suppose to plug in -2 into the equation?

317. ## math

can you answer this as soon as possible please just find the lcd of this rational algebraic expression 3x/x-4,2x/x+4

318. ## science

What is a type of substance that does not dissolve? Thank you

319. ## Math; Pre- Algebra

I neede help with how to solve equations with variabls on both sides. Can you give me some examples and work them out step by step?? Please!! :D

320. ## calculus

Would the derivative of ln(x^2) be 1/x^2? and also the derivative of ln(2^s) be 1/2^s

321. ## Math

CLEVELAND MADE 4 TYPING ERROR IN 60 WORDS. WHAT IS THE PROBABILITY THAT HIS NEXT WORD WILL HAVE AND ERROR?

323. ## Algebra

What is are the coordinates of the center and the radius of the circle with the equation (x+3)^2 + (y-5)^2 = 16 ?

324. ## Math

Find an equation for the line with the given properties. Containing the points (-5,4) and (-2,-6) Please help!

325. ## AP Calculas

Does f(x)=(2x^3-2x)/x^3+x^2-4x-4 have any horizontal asymptotes? How can you tell?

326. ## Social Studies

how did columbus made great imacts in our lives today

327. ## jake

The point (0,1) has the distance ____, from the line defined by y=-2x-1 How do you solve this? I tried the pythagorean theorem but I don't think I did it right as I came out with the square root of two. Can someone please explain this to me.

328. ## social history hs (poverty)

I can't seem to find a good website on the history of child poverty in america. I couldn't really find a good enough website that discusses the history of poverty in america. can you help me?

329. ## math

integrate from upper 4 to lower 6 (yes, upper is less than the lower in this case) (3x - ((x^3)/4) ... i tried splitting up the integrals and subtracting one from the other, but don't know the antiderivative of (x^3)/4 ... am i going about this all

330. ## Social Studies

Please check my answer 1. Scholars have done the least study into the political influence of _____ on American citizens. a. churches b. families c. schools d. media e. peers 2. The process of political learning in the United States is a. normally

331. ## college

I am stuck on Appendix B in psy/230 I am to find the five major concepts or events in three history periods 1930- 1950 I chose !@#\$%^& theory humanistic thoery cognitive theories learning theories and cognitiv/cosil leraning then 1950-1970 ther three

-8\x=12

333. ## language arts

give five examples of idiomatic sentences

335. ## language arts

I am doing a project on what kind of medicines were available in the 1830's because it has to do with this book we're reading and i can't seem to find any medicines that were used in the 1830's. Please help me! Thanks so much!!!!!, Taavon

336. ## Science

Given the formula Ca(PO)-- Calcium phosphate, if you had 2.00 moles, how many moles of oxygen atoms would you have? I attempted and got an unsure answer of 16.0

337. ## math

FIND the l.c.m of 16,21,15

338. ## Science

What is the hydrologic cycle?

339. ## Pre-calc

The question is solve for cosx= 0.60 on the interval [0,2pi). The answer is to be posted in radians. I don't understand how to find the answer.

340. ## Math

what is "a" in 2(a-5)-5=3

341. ## imaging

what is convolved image?

7rs&s

343. ## science

can a solution be made by mixing a solid, liquid, and a gas? explain.