# Questions Asked onNovember 23, 2014

1. ## Science

Which of the following electromagnetic waves is not used for communication?

2. ## Health And Physical Ed

1. during the exchange of air in your lungs, oxygen is being taken into your bloodstream while this substance is being released microorganisms carbon dioxide*** plasma mucus 2. the gas exchange of oxygen to the bloodstream takes place in what part of

3. ## Health And Physical Ed

true or false the main process for digestion takes place in the stomach true false*** regular excersise stimulates_____which keeps the skeletal muscles moving to assist in digestion and excretion. peristalis ures digestion*** villi the main process of

4. ## Math (trig)

The distance from home plate to dead center field in a certain baseball stadium is 409 feet. A baseball diamond is square with a distance from home plate to first plate base 90 feet. How far is it from first base to dead center field? I also need help

5. ## Precalc 2

At a state fair truck pull, two pickup trucks are attached to the back end of a monster truck as illustrated in the figure. One of the pickups pulls with a force of 1600 pounds and the other pulls with a force of 3200 pounds with an angle of 45° between

What characteristic best describes the low entropy associated with solids? A. The atoms in a solid are mostly metals. B. The atoms are held together with strong bonds. C. The atoms are arranged in a rigid structure. D. The solid has a high specific heat

7. ## HEALTH

1. during the exchange of air in your lungs, oxygen is being taken into your bloodstream while this substance is being released microorganisms carbon dioxide*** plasma mucus 2. the gas exchange of oxygen to the bloodstream takes place in what part of

8. ## chemistry

The National Institute of Science and Technology (NIST) kinetics database lists the rate constant, k, of a particular gaseous reaction as 8.56× 10–10 cm3·molecule–1·s –1 at 298 K. convert to units of M-1 s-1. convert rate constant to units of

9. ## physics

a concrete slab of mass 400 kg accelerates down a concrete slope inclined at 35 degrees. the coefficient of kinetic friction between the slab and slope is 0.60. determine the acceleration of the block

10. ## Chemistry

Calculate Ecell for reaction for the given info below.. O2(g)+2H2O(l)+4Ag(s)--> 4OH-(aq)+4Ag+(aq Ag+(aq)+ 1e ---> Ag(s) Ered= 0.80v O2(g)+2H2O(l) + 4e ---> 4OH- Ered= 0.40v My confusion is I have done problems similar to this when the Ered was negatives,

11. ## Chemistry

The rusting of iron is represented by the equation 4Fe+3O2=2Fe2O. A 1.45-mol sample of iron, how many moles of Fe2O3 will there be after rusting has completed.

12. ## physics

A ball thrown vertically upwards from ground level hits the ground after 4 seconds.Calculate the maximum height it reached during its journey.

13. ## algebra

Ariel bought several bags of caramel candy and taffy. the number of bags of taffy was 5 more than the number bags of candy. taffy bags weigh 8 oz each and caramel bags weigh 16 oz each.the total weight of the bags was 400 oz. how many bags of candy did she

14. ## Chemistry

What is the mole fraction of O2 in a mixture of 15.1g of O2, 8.16g of N2, and 2.46g of H2? (PLEASE EXPLAIN WHAT YOU DO!) Thanks

15. ## physics

A sled on ice moves in the ways described in the questions below. Friction is so small that it can be ignored. A person wearing spiked shoes standing on the ice can apply a force to the sled and push it along the ice.Which force would keep the sled moving

16. ## math

Two sides of a rectangular fence are 5 5/8 feet long The other two sides are 6 1/4 feet long. what is the perimeter

17. ## chemistry

50ml of 20.8% bacl2 and 100ml of 9.8% h2s04 solutions are mixed. Molarity of cl ions in the resulting solution wt of ba =137 I do not still understand step by step clearly Thank a lot

18. ## Physics

A lathe, initially at rest, accelerates at .60 rad/s^2 for 10s, then runs at a constant angular velocity for 20s, and finally decelerates uniformly for 10s to come to a complete stop. What is its average angular velocity?

19. ## statistics

An introductory psychology class has 9 freshman males, 15 freshman females, 8 sophomore males, and 12 sophomore females. If one student is randomly selected from this class, what is the probability of selecting a female? Round to the nearest hundredths

20. ## social studies

When France gave up control of Vietnam in 1954, which group gained control of North Vietnam and which group took charge of South Vietnam? 1 Cambodian forces gained control of North Vietnam and Laotian forces took charge of South Vietnam 2 Communist forces

21. ## Stats

21.4 A student survey. Tonya wants to estimate what proportion of the students in her dormitory like the dorm food. She interviews an SRS of 50 of the 175 students living in the dormitory. She finds that 14 think the dorm food is good.

22. ## math

3/4 of seats in a concert hall were occupied. The ratio of adults to children was 7:3. If 90 more adults attended the concert, the number of adults would be 3 times of number of children. How many seats were in the concert hall?

23. ## statistics

Farmer Max, sells grain to Germany, owns 60 acres of wheat fields. Based on the past experience, he knows that the yield from each individual acre is normally distributed with mean 120 bushels and standard deviation 12 bushels. Help Farmer Max plan for his

24. ## algebra

Elsie took all her cans and bottles from home to the recycling plant. The number of cans was one more then four times the number of bottles. She earned 12 cent for each bottle and 10 cent for each can, and ended up earning \$2.18 in all. How many cans and

25. ## English

Rochester says, "God pardon me!" and "Man, meddlee not with me" after Jane agrees to marry him because... Need to finish the sentence. This question is referring to the book, Jane Eyre.

26. ## math

A jar contains 133 pennies. A bigger jar contains 1 2/7 times as many pennies. What is the value of the pennies in the bigger jar

27. ## Chemistry

Calculate the pH of a 1.19M sodium formate, HCOONa, solution.

28. ## chemistry

What mass of rhodium contains as many atoms as there are zirconium atoms in 23 g of zirconium?

29. ## College English

The can of mushroom soup must have spoiled it was bulging at the top.

30. ## Probability

You have a blind date with a physics major. From your social networking experience, you know that 10% of physics majors are immature, 50% are narcissistic, and 90% are boring. Assume that immaturity, narcissism, and boringness are independent events.

31. ## Calc

Three students have ordered a 14 inch diameter pizza. They slice it with 2 parallel cuts, giving them 3 pieces with equal area. The two cuts are equidistant from the center of the pizza. Find the horizontal distance between one cut and the center of the

32. ## physics

In an effort to loosen the bolt on the wheel of a car, a man with a mass of 70kg steps on the end of a 50cm tire iron which is extending horizontally from the bolt. How much torque is he applying to the bolt?

33. ## Chemistry

Draw all of the possible alkyne isomers of CH≡CCH2CH2CH2CH3.

34. ## physics

When a wave crosses a boundary between a thin and a thick rope, its frequency changes, but its wavelength and speed do not. True or false I think the answer is True

35. ## physics. I waited over two days for response

An 800kg police boat slows down uniformly from 50km/h (E) to 20km/h(E) as it enters a harbour. If the boat slows down over a 30m distance, what is the force of friction of the boat? (Hint: you will need to convert the velocities into m/s) please show your

36. ## chemistry

2Al (s) + 3Cl2 (g)  2 AlCl3 (s) i)obtain the limiting reagent. when 2.00 mole of Cl2 (g) is reacted with 54.3 g of Al (p). ANSWER : Cl is limiting reagant. 54.3gAl(p)/27 = 2.01AI(P) Initial = 2.01 mol 2 mol divied = 2.01/2 2/3 = 1.005 =0.67 cl is

37. ## math

Kaylin mixed two liquids. One container held 7/8 cup and the other held 8/10 cup. What is the total amount of the mixture? My answer is 1 cup 4/5 of mixture.

38. ## Physics

A car accelerates from rest to 90km/h in 10 seconds.What is its acceleration in m/s2?

39. ## physics

A 0.500kg ball is tied to the end of a 1.50m string and revolved so its andle thata is 35 degrees. a.) find the velocity of the ball (ans 2.43)

40. ## Physics

A lathe, initially at rest, accelerates at .60 rad/s^2 for 10s, then runs at a constant angular velocity for 20s, and finally decelerates uniformly for 10s to come to a complete stop. What is its average angular velocity?

41. ## chemistry

Calculate the vapor pressure of a solution containing 28.7g of glycerin (C3H8O3) in 136mL of water at 30.0 ∘C. The vapor pressure of pure water at this temperature is 31.8 torr. Assume that glycerin is not volatile and dissolves molecularly (i.e., it is

42. ## Algebra

Solve the problem using matrices. John has a jarful of quarters and nickels. There are 84 coins in the jar. The value of the coins is \$13.00. How many of each type of coin are there? A) 49 quarters ; 35 nickels B) 44 quarters; 40 nickels C) 79 quarters; 5

43. ## maths

The 4th term of an ap is 15 while the 7th term is 27, find the sum of the 9th and 10th term.

44. ## algebra

If it takes 4 ounces of insecticide to make 2/1/2 gallons of garden spray, how much spray can be made with 6 ounces of insecticide My answer was x=24 is it right???

45. ## Math (trig)

A force of 35lb is required to hold a 72lb toolbox on an incline. What angle does the incline make with the horizontal? Please help me set this up.

46. ## physics

A 1.2kg lead ball is launched off a cliff top at 16m/s at an angle of 20 degrees above the horizontal. The height of the horizontal is 15m. Determine the net force acting on the lead ball that caused the ball to drop 4.0m from point P.

47. ## algebra

Solve by using a system of equations. The number x of MP3 players a manufacturer is willing to sell is given by x = 20p − 1500, where p is the price, in dollars, per MP3 player. The number x of MP3 players a store is willing to purchase is given by x =

48. ## math

A baloon is 200 m off the ground and rising vertically at the rate of 15 m/sec an automobile passes beneath it travelling along a straight road at a constant rate of 45km/hour how fast is the distance between them changing one second later???

49. ## CHem

Iodine forms three compounds with chlorine. Choose the correct molecular shapes. ICl3 ICl5 ICl

50. ## Physics

A projectile of mass 0.99 kg is shot from a cannon. The end of the cannon’s barrel is at height 6.6 m, as shown in the figure. The initial velocity of the projectile is 9.2 m/s. The projectile rises to a maximum height of ∆y above the end of the

51. ## science

An athlete executing a long jump leaves the ground at a 27.7∘ angle and travels 7.60m.If this speed were increased by just 5.0%, how much longer would the jump be?

52. ## algebra

A motorboat traveling a distance of 225 miles in 5 hours while traveling with the current. Against the current, the same trip took 9 hours. Find the rate of the boat in calm water and the rate of the current. rate of boat mph rate of current mph

53. ## Physics

A person pushes on a doorknob with a force of 5N. The direction of the force is at an angle of 20 degrees from the perpendicular to the surface of the door. The doorknob is located .800m from axis of the hinges of the door. The door begins to rotate with

54. ## Physics

A certain car has an acceleration of 2.4m/s2.Assume that its acceleration remains constant. Starting from rest,how long does the car require to reach a velocity of 90km/h? How far does it travel while reaching that velocity?

55. ## Mechanical Behavior of Materials

What is the exact strain energy per unit length of an edge dislocation for a material that has a Young's modulus E of 50GPa, a Burger's vector b of 0.25nm, a dislocation density ρ of 108cm−2, and a Poisson's ratio ν of 0.3? Uedge (in J/m): What is the

56. ## MTH LIBERAL ARTS

Evaluate the expression. Determine the number of combinations of 7 things taken 4 at a time. & Mark can remember only the first 4 digits of his friend's phone number. He also knows that the number has 7 digits and that the last digit is not a 0. If Mark

57. ## Fractions

Last week, a sporting goods store had a big sale. During the sale, shoppers bought 1/15 of the store's basketballs. After the sale, there were 308 basketballs left. How many basketballs were there originally? Can someone please show me how to solve this

58. ## Chemistry

An excess of Al and 7.9 Mole of Br2 are reacted according to the question 2Al+3 Br2 equals 2AlBr3

59. ## Chemistry

Calculate the pH of a buffer solution made by mixing 231 mL of a 1.04M trimethylamine (CH3)3N solution with 176 mL of a 1.38M trimethylammonia chloride, (CH3)3NHCl solution. Enter your answer to TWO decimal places. DO NOT use scientific notation.

60. ## chemistry

Use the Henderson-Hasselbalch equation to calculate the pH of a solution that is 0.140M in propanoic acid and 0.120M in potassium propanoate

61. ## Math (trigonometry)

Hi, I need help with these problems, I'm not sure where to start. The book's examples are different. Thanks in advance!! 1.) To find the distance AB across a river, a distance BC of 472m is laid off on one side of the river. It is found that B=108.1

62. ## Physics

An aircraft landing on an aircrafts carrier is brought to a complete stop from an initial of 215km/h in 2.7 seconds. What is its acceleration in m/s2?

Which of the following would have the greatest entropy? A. Water placed in the refrigerator B. Water sitting out on the kitchen counter C. Water vapor D. An ice cube I think c what about you drbob222

64. ## math

In how many different ways can two pennies, three nickels, four dimes, and five quarters be arranged in a row?

65. ## Physics

In a running event, a sprinter does 4.1 ✕ 105 J of work and her internal energy decreases by 8.1 ✕ 105 J.

66. ## physics

A proton moves with a velocity V (2i - 4 j + k) m / s in a region where the field is given by B = (i + 2 j -3k) T . What is the magnitude of the magnetic force experienced by the load?

67. ## physics

An object of mass 1.5 kg rests on a shelf where it has a gravitational potential energy of 7 joules. An object of mass 4.5 kg is placed on the same shelf. What is the gravitational potential energy of this second object?

68. ## Physics

An aircraft landing on an aircrafts carrier is brought to a complete stop from an initial of 215km/h in 2.7 seconds. What is its acceleration in m/s2?

69. ## Chem

An excess of Al and 7.9 mole of Br2 are reacted according to the equation 2Al+ 3Br2 equals 2AlBr3. How many moles of AlBr3 will be formed assuming 100% is yield?

70. ## Physics

A man is holding an 8.00kg vacuum cleaner at arm's length, a distance of .550m from his shoulder. What is the torque on the shoulder joint if the arm is held at 30degrees below the horizontal?

71. ## Trig

Find the magnitude and direction angle for each vector. Give the measure of the direction angle as an angle in [0,360].

72. ## Chemistry

Calculate the energy (kJ) required to raise the temperature of 22g of water from 12 C to 90 C.

73. ## math

The atmospheric pressure P in pounds per square inch (psi) is given by P = 14.7 e−0.21 awhere a is the altitude above sea level (in miles). If a city has an atmospheric pressure of 11.11 psi, what is its altitude? (Recall that 1 mi = 5,280 ft.

74. ## algebra

Flying with the wind, a plane traveled 390 miles in 3 hours. Flying against the wind, the plane traveled the same distance in 5 hours. Find the rate of the plane in calm air and the rate of the wind. rate of plane ? mph rate of wind ? mph

75. ## Physics

The angular velocity of a wheel is given by w(t) = (2.00 rad/s^2)t + (1.00 rad/s^4)t^3. A. What is the angular displacement of the wheel from time t=0.00s to time t=T? B.What is the angular acceleration of the wheel as a function of time?

76. ## Physics

What is the vector product of A=2i + 3j + 1k and B=1i - 3j - 2k?

77. ## Statistics

The Graduate Record Exam has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. A. What percentage of the persons who take the test score above 1300? b.

78. ## Physics

A roll of toilet paper (a partially hollow cylinder with R_2 = 7.5cm, M = 300g, and I = 9.0 x 10^-4 kg m^2) is mounted on a mass-less axle along its central axis. Te roll is initially at rest. Then, at t=0, a child grabs the end of the roll and starts

79. ## Chemistry

If 120. grams of KClO3 reacts, how many grams of oxygen are produced?

80. ## Mechanical Behavior of Materials

A material has a Young's modulus E of 50GPa, a Burger's vector b of 0.25nm, and a Poisson's ratio ν of 0.3. What is the approximate line tension for a dislocation in this material?

81. ## physics

Air at 1 atm is inside a cylinder 17.9 cm in radius and 17.9 cm in length that sits on a table. The top of the cylinder is sealed with a movable piston. A 24.1-kg block is dropped onto the piston. a) From what height above the piston must the block be

82. ## mechanics

A halogen gas failed balloon released frim the ground,travels vertically up with a constant acceleration of 2m/s^2.Three seconds later,a stone is projected vertically up from the ground to hit the ascending balloon.The stone just manages to touch the

83. ## Algebra

In how many wYs can a chairperson and a vice chairperson be selected from a committee of 15 senators?

84. ## POL 201

The federalists argued that a Bill of Rights was not necessary because? A. All basic protections were contained in the Constitution. B. the anti-Federalists were being irrational. C. it impedes the authority of the government. D. it would take too long to

85. ## physics

A(n) 1949.1 kg car is coasting along a level road at 22.9 m/s. A constant braking force is applied, such that the car is stopped in a distance of 74.6 m. What is the magnitude of the braking force? Answer in units of N

86. ## Physics

A two dimensional object placed in the xy plane has three forces acting on it: a force of 3N along the x axis acting at a point (3m, 4m); A force of 2N along the y axis acting at (-2, 5m); and a force of 5N in the negative x direction acting at (-2m, -3m).

87. ## Chemistry

How do you set up this problem? Calculate the volume , in ml of a 0.150 M NaOH soulution needed to neutralize 25.0ml of a 0.288 M HCl solution?

88. ## Chemistry

How many grams of nitric acid (HNO3) must be dissolved in 590 ml of water to make a solution with a pOH = 10.1? Select one: a. 2.9 x 10-9 g b. 7.9 x 10-3 g c. 4.7 x 10-3 g d. 7.9 x 10-6 g e. 7.4 x 10-5 g

89. ## Trig

Does this result in no triangle, 1 or 2 triangles? If so, then solve. B= 88 degrees, b= 4 and a=23. I know that A= (sin 88)(23)/(4)= A=5.74 degrees C= 180-5.74-88= C=86.26 degrees c=(sin86.26)(4)/(sin 88)= c=3.99 My question is how do you know if it's 0,1,

90. ## Chemistry

In the reaction 2A+B2 to 2AB if 0.5 moles of A and an excess of B are combined and the reaction goes to %100 completion, then how many moles of C are formed?

91. ## Art History

Which of the following is a specialist in ritual that opens the lines of communication between the supernatural and human worlds? A. Diviner B. Oba C. Iyoba D. Oni I think it's A.

92. ## Calculus

Find the x-values of all points where the function below has any relative extrema. Find the values(s)of any relative extrema. G(x)=(x-3)^2/x-4. How do I solve this?

93. ## Physics

A boy wants to throw a ball into his friend’s window 16.0 m above. Assuming it just reaches the window, he throws the ball at 55.0° to the ground. At what velocity should he throw the ball?

94. ## statistics

You have a face-to-face statistics class in the traditional classroom setting. There are 25 males and 45 females enrolled. You’re the instructor so you like to arrive in the classroom before the first students arrive. What is the probability that the

95. ## Algebra

Find the values of a, b, and c such that the equation y=ax^2+bx+c has ordered pair solutions (-3,-22), (-1,2) and (3,2) a = 2; b = 8; d = 4 a = -2; b = 4; c = 8 a = 2; b = 4; c = 8 a = -2; b = 8; c = 4

On the surface of a planet an object is thrown vertically upward with an initial speed of 60 m/s. use a conservation of energy approach to determine the object's speed when the object is at a quarter of it's maximum height. (assume the planet has no

97. ## physics

A(n) 1949.1 kg car is coasting along a level road at 22.9 m/s. A constant braking force is applied, such that the car is stopped in a distance of 74.6 m. What is the magnitude of the braking force? Answer in units of N

98. ## math

WHEN MR. LOWE RETURN FROM HIS FISHING TRIP, HIS STUDENTS INQUIRED AS TO THE LENGTH OF HIS PRIZE CATCH. MR. LOWE ANSWERED. "THE HEAD MEASURED 9 INCHES." "THE TAIL WAS AS LONG AS THE HEAD AND HALF THE BODY." THE BODY WAS AS LONG AS THE HEAD AND TAIL." HOW

asked by Maya Is The Best Freaking Person Ever!
99. ## English

I am capable of swimming in the sea. I am able to swim in the sea. I can swim in the sea. --------------------- Are they all the same and grammatical?

100. ## chemistry

I have to calculate the ΔV= final volume-initial volume For the first trial the final volume was .005mL the initial volume was .03mL, which equaled to -.025mL. The volume was negative because it was exothermic reaction. For the second trial the final

101. ## Chemistry

What mass of AuCl3 contains 160.9 g of gold? My work i got 104.6 g Am i right?

102. ## Physics

a projectile is fired at such an angel from the horizontal that the vertical componet of its velocity is 49m/s. the horizontal componet of its velocity is 61 m/s. what is the initial velocity of the projectile?

103. ## physics

a 65 kg bag is dragged along a 12m ramp in order to get from the ground to the floor of the loading dock 2m above the ground. determine the efficiency of of the ramp. The frictional force acting on the bag is 50N due to the ramp. I don't understand how to

104. ## chemisty

how many mL of a stock 2.50M HCI solution are required to prepare 25.mL of a 0.15M HCI solution?

105. ## Physics

An 8.00g bullet is fired at 220m/s into a 250g wooden block that is initially at rest. The bullet remains in the block and after the collision the two slide up a 30 degree incline. a) Solve for the velocity of the bullet block after the collision. b)

106. ## mechanics

Drops of water leak from a tap 2m above the basin at regular intervals.As the first drop strikes the basin the fourth drop starts its fall.what is the spacing between the drops 1and 2,drop 2and3,drop 3and4 at this instant.

107. ## trig

I need help setting this problem up. A force of 36lb is required to hold a 70lb toolbox on an incline. What angle does the incline make with the horizontal?

108. ## physics

it takes about 560 kilowatts to run a diesel locomotive at speed around 180km/h.Magnetically levitated trains(mag levs) on the other hand require less power because the magnetic levitation eliminates energy loss to friction.The worst maglev system requires

109. ## Chemistry

What volume will 823 mL of SO3 gas at 11 degrees celsius and 720 mm Hg occupy when the pressure is raised to 1.55atm and the temperature is raised to 81 degrees celsius?

110. ## Physics

The angular velocity of a wheel is given by w(t) = (2.00 rad/s^2)t + (1.00 rad/s^4)t^3. A. What is the angular displacement of the wheel from time t=0.00s to time t=T? B.What is the angular acceleration of the wheel as a function of time?

111. ## 6th Grade Math Homework Check

In the first hour after opening, a coffee shop used 5 2/3 pounds of unflavored coffee. The shop used 2 1/2 times as much flavored coffee as unflavored. How many pounds of flavored coffee did the shop use? My Answer: 14 1/6

112. ## Chemistry

The thermite reaction was used to weld rail ties together. If 15.0 grams of aluminum were used, how many grams of ferric oxide would be required? How many grams of molten iron would forma?

113. ## science

Rates of Reactions I am conducting a experiment on increasing the rate of a reaction by increasing the surface area. For this I am reacting hydrochloric acid and marble chips. Variables:- -Independent: the mass of marble chips -Dependent: The volume of gas

114. ## Physics

A 0.118 kg baseball traveling with a horizontal speed of 3.14 m/s is hit by a bat and then moves with a speed of 33.7 m/s in the opposite direction. What is the magnitude of the change in the ball's momentum?

115. ## Chemistry

Calculate the S(univ) for the following phase change at 25 deg celcius. The boiling point of heptane is 98.0 Celcius and has a Delta Hvap= +21.6kj/mol. C7H16(l)--> C7H16(g) Delta S= +79.0j/k I know that the equation is Delta Suniv= DSsys + DSsurr PLEASE

116. ## English

What is an example of morbidity in The Fall of House of Usher by Edgar Allan Poe?

118. ## American Government

Hi, I need some help with a couple government questions. 1. State governments could print their own paper money under the articles of confederation. True or False **my answer=true 2. Which of the following explains changes that happened in U.S. foreign

119. ## Mechanical Behavior of Materials

Consider a sample of well-annealed copper. Find the Burger's vector given that the energy per unit line length is 1.4×10−9J/m, E=177GPa and ν=0.36. Assume α=0.5. b (in nm):

120. ## Physics

A pond is 12 metres across. The crests of two successive waves are 60.0 cm apart and they each move across the pond in 15 seconds. a)What is the velocity of the waves? b)What is the frequency of the waves? c)What is the period of the waves?

121. ## kendriya vidyalaya

How to write 22nd November 2014 in 9 letters

122. ## physics

A 4.40kg block hangs from a spring with spring constant 2160N/m . The block is pulled down 4.60cm from the equilibrium position and given an initial velocity of 1.40m/s back toward equilibrium. What is the frequency of motion? What is the amplitude? What

123. ## Chemistry

A certain reaction has an equilibrium constant of 0.65. Calculate the constant for the reverse reaction.

Sheila spent x hours studying on a Tuesday and 1/4 hour studying on Thursday. What was the total amount of time in hours Sheila spent studying if x = 2/4? Do I add 1/4 + 2/4?

125. ## chemistry

How many milliliters of 0.413 M NaC2H3O2 are needed to supply 27.3 g NaC2H3O2?

126. ## Biochemistry

Using your results from the titration what mass of antacid is required to neutralized 25 ml of HCl. RESULTS: titration: mass of antacid:V of Hcl neutralized : 1:0.31.25.60 2:0.295.32.20 3:0.300.33.20

127. ## Basic Math (Check my answer)

Which of the following is equal to 1/6 ÷ 1/18? Assume the shapes are rectangular. Describe another situation that this quotient models. A) The area of a planter that is 1/6 yard wide and 1/18 yard long. B)The width of a 1/18-square-meter flower bed that

128. ## evans

Find the least common denominator of the rational expressions. and

129. ## Physics

True or false Wavelength is the distance between two adjacent points on a wave that are in phase My work I think it is false

130. ## Statistics

A sample of 148 values is randomly selected from a population with mean, μ, equal to 46 and standard deviation, σ, equal to 17. (Give your answers correct to one decimal place.) (a) Determine the interval (smallest value to largest value) within which

131. ## capacitors

in a series circuit ,one capacitor is 0.047 micro Farads, the other capitor has a unknown value,with a sine wave generator at 10Vrms, what is its capacitance.

True or False 1. The frequency of the wave can be changed by changing the frequency at which the waves are generated 2. Two crests are out of phase with each other. A crest and a trough are in phase with eachother 3. When a wave reaches the boundary of a

133. ## math,trigonometry

From a tower 36m high situated on one side of a river, the angle of desperation of the opposite side of the river is 25 degree. FInd the width of the river?

134. ## College Physics

A thin rod (uniform density & thickness) has mass M and length L. It is attached to the floor at a fixed location by a friction-less hinge. The rod start at rest, balanced vertically on its hinge end. ______________________________________ 1) While

135. ## Physics

A piece of aluminum has a volume of 1.55 x 10-3 m3. The coefficient of volume expansion for aluminum is = 69 x 10-6(C°)-1. The temperature of this object is raised from 25.9 to 406 oC. How much work is done by the expanding aluminum if the air pressure is

136. ## english

I would like to know if writeacher is doing well. Ms Sue, could you please let me know? Many thanks. Franco

137. ## Statistics

If a committee of 4 students is selected from a class of 16 students, how many ways can this be done?

138. ## Physics

True or false 1. When a wave reaches the boundary of a new medium,part of the wave can be reflected and part of the wave can be transmitted into the new medium. 2. When a wave crosses a boundary between a thin and a thick rope its frequency changes, but

139. ## Chemestry

A sample of crude potassium iodide was analyzed using this reaction (not balanced): I- + SO42- I2 + H2S (acid solution) If a 4.19-g sample of crude KI produced 1.33 g of iodine, what is the percent purity of the KI?

140. ## Theology 10 - HELP!

Do you think miracles happen today? Why? I have to asked someone this question so this is not a question for me to answer. I'll really appreciate if you answer my question and explain why.

141. ## English

I skipped breakfast again. ----------------------- In normal speech, don't we pronounce 'ed' in 'skipped'?

142. ## English

What is the attitude Edgar Allan Poe has toward the insanity in The Fall of the House of Of Usher?

143. ## Math

The temperature on one day in January for Phoenix, AZ, is 60 degrees Fahrenheit. On the same day in Barrow, AK, the temperature is -29 degrees Fahrenheit. What is the difference between these two temperatures?

144. ## biochemistry

What happens if I try to make a pH 6 buffer by diluting 0.100 M HCL (aq) with water .

145. ## American Government

I need some help with some Government questions: 1. All of the following are ways that formulating our budget has changed EXCEPT: A. Budget and Accounting Act of 1921 B. transfer of Office of Management and Budget to the Executive Office of the President

146. ## Chemistry

What mass of pure silver would you obtain from 85.0 g of AgNO3? My work The answer i got is 53.55 g Am i right?

147. ## Physics

A 4.40kg block hangs from a spring with spring constant 2160N/m . The block is pulled down 4.60cm from the equilibrium position and given an initial velocity of 1.40m/s back toward equilibrium. What is the frequency of motion? What is the amplitude? What

148. ## Chemistry

How many mL of a stock 2.50M HCl solution are required to prepare 25.0 mL of a 0.15M HCl solution?

149. ## physics

Moving fast proton of 4x106 m / s through a 1.7 T magnetic field experiences a force 8x10-13N magnetic. What is the angle between the velocity vector associated with the proton and the magnetic field?

151. ## economics

Why is the subject of managerial economics relevant to the problem of global warming

152. ## Trigonometry

d=150secx Determine an exact expression for the distance when x=pi/6

153. ## Calculus

Find the volume of the solid obtained by rotating the region bounded by the curves: y = x^2 and x = y^2 about the line y = 1. I received the answer pi/30, using the outer radius of (1 - x^2) and the inner radius of (1 - x^(1/2)). Is this correct?

154. ## chem

What are the expected charges on the following transition metals? Mn= Rh=

155. ## Biochemistry

Using your results from the titration what mass of antacid is required to neutralized 25 ml of HCl. RESULTS: titration: mass of antacid:V of Hcl neutralized : 1:0.31.25.60 2:0.295.32.20 3:0.300.33.20

156. ## statistics

In a study for a local clinic, you have found that the average number of patients between 9am and 12noon on Friday is five patients. Using a Poisson distribution and the probability more than eight patients will arrive?

157. ## Trig

I need help with my vectors unit. I'm really confused about how to set them up. Please help. a.) Given u=2i-5j and v=-i+3j, determine -6u-3v? b.) Find the component form of v if |v|=4 and the angle it makes with the x-axis is 60 degree. c.) Given u=5i+3j

158. ## Maths

Hi, have completed a whole worksheet but the challenge involves finding the first five terms from the following terms: a) 3n^2 - 2 b) 2n^2 - 4 I have no idea how to go about this so any guidance would be greatly appreciated! Thanks

How does Exothermic and Endothermic reactions affect the rate of a reaction? Please help. I need something that will be easy for me to understand and adopt into my own words. Thank You :)

160. ## Chemistry - Heat of Fusion of Ice

I need help with these questions since the lab report needs to be completed like...NOW >_< We were supposed to experimentally determine the heat of fusion of ice and compare it to the accepted value as listed in your reference table.Please help me: Does

161. ## Algebra 2

Solving Quadratic System x^2+4y^2=16 x^2+y^2=4 Please SHOW WORK I'm having trouble solve this...

162. ## Physics

A thin rod (uniform density & thickness) has mass M and length L. It is attached to the floor at a fixed location by a friction-less hinge. The rod start at rest, balanced vertically on its hinge end. ______________________________________ 1) While

163. ## science

just being curious, why does hurricane occur?? thanks

165. ## Maths

What side lengths could a rectangle have such that it's area rounds to 20 m squared ( to the nearest 10 )

166. ## Sociology

give an example of a current technology of the post-industrial era that is changing the way family might be structured. Given your experience in an online environment, can you predict what changes in the family unit might occur due to the information age?

167. ## Physics

The frequency of the wave can be changed by changing the frequency at which the waves are generated. True or false My work I think the answer is false

168. ## Calculus

Find the volume of the solid obtained by rotating the region bounded by the curves: 2x = -y^2 y^2 = -x + 2 y = 0 for y >= 0 about the x-axis. Not sure how to do this one, could anybody help me identify what this looks like and how to identify the

169. ## physics

a 65 kg bag is dragged along a 12m ramp in order to get from the ground to the floor of the loading dock 2m above the ground. determine the efficiency of of the ramp. I don't understand how to the find the energy output and input.

170. ## Trig- math

Find the area of a triangle if the sides of the triangle have the lengths 849mi, 930mi, and 1301mi. Here's my work: a=849 b=930 c=1301 A=.5(849)(930)sinA sin A = 394,785 mi^2 (this number doesn't seem right to me, can you explain to me what I did wrong)?

171. ## Science

How does Exothermic and Endothermic reactions affect the rate of a reaction? Please help. I need something that will be easy for me to understand and adopt into my own words. Thank You :)

172. ## math

4/5 * 3/4 = =16/20 * 15/20 =240/20 =12 is this right?

173. ## Calculus

Use Riemann sums and limits to compute the area bounded by f(x) = 10x+9 and the x axis between x=10 to x =5 The area is = to

a 65 kg bag is dragged along a 12m ramp in order to get from the ground to the floor of the loading dock 2m above the ground. determine the efficiency of of the ramp. The frictional force acting on the bag is 50N due to the ramp. I don't understand how to

175. ## Calculus

h(t)= -16t^2 + v0t. How fast is the object moving after 5 seconds?

176. ## American Government

When Congress prepares a budget

177. ## economics

Explain the relative advantages and disadvantages of time series and cross section studies for estimating cost fiction in the long run

178. ## Math

How do you graph a rectangle and find its area if: A(1,-3) B(1,3) C(-9,3) D(-9,-3)

179. ## geography

What are the controls of earthquake

180. ## math

5/7 * 9/10 = 50/70 * 63/70 =3150/70 =45

181. ## math

1 3/5 - 5/6 =8/5 - 6/5 =2/5 or is it =1/3/5 - 5/6 =48/30 - 25/30 =23/30 I don't know which one is right. Pleas e help!

182. ## math

what are the steps in determining how to maximize the area of a rectangle given a specific perimeter?

183. ## Biochem

Using your results from the titration what mass of antacid is required to neutralized 25 ml of HCl. RESULTS: titration: mass of antacid:V of Hcl neutralized : 1:0.31.25.60 2:0.295.32.20 3:0.300.33.20

184. ## chem

If a sample of gas has a volume of 8.20

185. ## Algebra 2

Quadratic Systems y=3x^2-5 x-y=3 Could you tell me the answer.I want to make sure I'm right and could you show work

186. ## tenant relations

check my answer 1-b 2- a 3- b 4- b 5- a

187. ## science

What r 4 alkali's that u would find in the house????? Luv Sara xxxx

188. ## math

1/3 / 7/9 =1/3 * 9/7 =9/21 is this right??

189. ## math

5/7 *9/10 =63/70 =9/10