# Questions Asked onNovember 4, 2010

1. ## Physics

3. A person exerts a force of 55 N on the end of a door 74 cm wide. What is the magnitude of the torque if the force is exerted a)perpendicular to the door b)at a 45 degree angle to the door, c) at a 125 degree angle to the door?

2. ## chemistry

In the REDOX reaction in basic solution Zn-->Zn(OH)4+H2 I know that the first half reaction is 4H20+Zn-->Zn(OH)4 +4H+e but the second one is either 2e+2H2O--->H2+2OH (WHICH IS THE ANSWER GIVEN ON THE WORKSHEET) OR 2e+2H-->H2 I think both leads to the same

3. ## Chemistry

Hydrogen and methanol (CH3OH) have both been proposed as alternatives to hydrocarbon fuels. a) Write balanced chemical equations for the complete combustion of hydrogen and the complete combustion of gaseous methanol. Combustion reaction for hydrogen:

4. ## Physics

A dentist's drill starts from rest. After 3.20 s of constant angular acceleration it turns at a rate of 2.7 104 rev/min. (a) Find the drill's angular acceleration. (b) Determine the angle (in radians) through which the drill rotates during this period.

5. ## AP Chemistry

One way of separating oxygen isotopes is by gaseous diffusion of carbon monoxide. The gaseous diffusion process behaves like an effusion process. Calculate the relative rates of effusion of 12C16O, 12C17O, and 12C18O. Name some advantages and disadvantages

6. ## Physics - Standing Waves

a) A plot of lnv vs. lnT should be a straight line. Why? b) What is the slope of the straight line? c) What is the intercept of the straight line?

7. ## Chemistry

How much heat, in kilojoules, is associated with the production of 273kg of slaked lime, Ca(OH)2? CaO(s)+H2O(l)-->Ca(OH)2(s) delta H=-65.2kJ

8. ## PHYSICS HELP

The maximum lift force on a bat is proportional to the square of its flying speed v. For the hoary bat (Lasiurus cinereus), the magnitude of the lift force is given by FL (0.021 N·s2/m2)v2 The bat can fly in a horizontal circle by "banking" its wings at

9. ## college chemistry

Balance the equation in aqueous acidic solution: C2O42-(aq) + MnO4-(aq) → Mn2+(aq) + CO2(g) please teach me how to do it!

10. ## chemistry

what the balanved equation for gaseous sulfur dioxide reacts with water to form aq sulfurous acid (H2SO3)

11. ## college chemistry

The base dissociation equilibrium constant (Kb) for C5H5N is 1.40×10-9 (eq. 1). (eq. 1): C5H5N(aq) + H2O(l) = OH-(aq) + C5H5NH+(aq) Calculate the value of the equilibrium constant (Ka) for the hydrolysis of C5H5NH+ as shown in the reaction (eq. 2). (eq.

12. ## calculus

A square-based, box-shaped shipping crate is designed to have a volume of 16ft^3. The material used to make the base costs twice as much (per ft^2) as the material in the sides, and the material used to make the top costs half as much (per ft^2) as the

13. ## STOICHIOMETRY

2Al + 3CuSO4 ! Al2(SO4)3 + 3Cu What is the maximum amount of Cu (63.5 g/mol) that could be produced by reacting 20.0 grams of Al (27.0 g/mol) with excess CuSO4?

14. ## College Chemistry

Calculate the pH of a 0.5 M Formic Acid (HCOOH) soln. ka= 0.00018

15. ## Chem

What is the enthalpy for the following reaction? C2H4+H2O--->C2H5OH

16. ## chem

A 455-g chunk of iron is removed from an oven and plunged into 385g water in an insulated container. The temperature of the water increases from 27 degrees celsius to 89 degrees celsius. If the specific heat of iron is 0.449 J g^-1 degrees Celsius^-1, what

17. ## chemistry

A lab technician determines the boiling point elevation of an aqueous solution of a nonvolatile, nonelectrolyte to be 1.95°C. What is the solution's molality?

18. ## calculus

A rectangle is constructed with its base on the diameter of a semicircle with radius 5 cm and with two vertices on the semicircle. What are the dimensions of the rectangle with maximum area?

Heather bought a ten-year maturity corporate bond when it was issued for $1,000. The bond has an annual interest rate of seven percent and pays interest semi-annually. How much does she receive every six months? asked by Ed 20. ## Physics A 0.18 kg point mass moving on a frictionless horizontal surface is attached to a rubber band whose other end is fixed at point P. The rubber band exerts a force F = bx toward P, where x is the length of the rubber band and b is an unknown constant. The asked by Jessica 21. ## Chem What is the enthalpy for the following reaction? overall: C2H4+H2O--->C2H5OH is -1411kJ correct?? asked by Angel 22. ## math The distance between goalpost, BC, is three times the distance from the top of the goalpost to the bottom. If the perimeter of ABCD is 21 1/3 yards, what is the length of BC asked by alex 23. ## physics The drawing shows a type of flow meter that can be used to measure the speed of blood in situations when a blood vessel is sufficiently exposed (e.g., during surgery). Blood is conductive enough that it can be treated as a moving conductor. When it flows asked by tee 24. ## physics The drawing shows a type of flow meter that can be used to measure the speed of blood in situations when a blood vessel is sufficiently exposed (e.g., during surgery). Blood is conductive enough that it can be treated as a moving conductor. When it flows asked by tee 25. ## chemistry According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 3.5 x 10(3) m/s, the uncertainty in its position is at least a)66 m b)17 m c)6.6 x 10-8 m d)1.7 x 10-8 m e)None of the above asked by lavonne 26. ## trig 3tan(3x) = sqrt(3) Solve the equation for exact solutions of the interval [0,2pi). asked by kyle 27. ## Chemistry How much boiling water would you need in order to raise the bath to body temperature (about 37)? Assume that no heat is transferred to the surrounding environment. Imagine that your water heater has broken, but you want to take a bath. You fill your asked by Bella 28. ## Chemistry(I'm sooo confused here!) The Rydberg equation, with n1=1, predicts an ultraviolet series of spectral lines of atomic hydrogen. Which of the following wavelengths is not predicted by the equation: 1/ = (1.097 x 10(7) m - 1) x (1/n1(2)-1/n2(2) a)182 nm b)103 nm c)97 nm d) 95 nm e) asked by lavonne 29. ## math grade 11 A quadratic function is defined by f(x)= 3x^2+4x-2. A linear function is defined by g(x)= mx-5. what values(s) of the slope of the line would make it a tangent to the parabola asked by priya 30. ## chemistry how many moles of butane gas c4h10 react to produce 3.50moles of water? asked by tracey 31. ## Physics A spherical 0.34 kg orange, 2.0 cm in radius, is dropped from the top of a building of height 31 m. After striking the pavement, the shape of the orange is a 0.60 cm thick pancake. Neglect air resistance and assume that the collision is completely asked by Tired 32. ## chemistry How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 125.0 mL of 0.19 M H2SO4? asked by MaryJ 33. ## math washington school cost about$12,350,000 to build. use words to write that amount of money. 24. two factors of 16 are 1 and 16 beacuse 1*16= 16. find three more factors of 16.

Consider the equation 3x+5y=k, what values could k so that the x-intercept and y- intercept on the equations graph would both be integers. explain.

35. ## chemistry

How many moles of solute are contained in a 150ml solution of a 0.25 M NaNO3 solution?

36. ## Physics

A rotating wheel requires 9.00 s to rotate 29.0 revolutions. Its angular velocity at the end of the 9.00 s interval is 98.0 rad/s. What is the constant angular acceleration of the wheel in radians/second squared? (Do not assume that the wheel starts at

37. ## physics

A small, 300 g cart is moving at 1.90 m/s on an air track when it collides with a larger, 2.00 g cart at rest. After the collision, the small cart recoils at 0.820 m/s. What is the speed of the large cart after the collision?

This is the question I posted about two hours ago and I worked it out two ways-could you scroll down and check it, please?If I have a roller coaster, and hill 1 height is 50cm and hill height 2 is 25 cm and the PE is .9 as it approaches the top of hill 2,

39. ## Physics

The maximum lift force on a bat is proportional to the square of its flying speed v. For the hoary bat (Lasiurus cinereus), the magnitude of the lift force is given by FL (0.021 N·s2/m2)v2 The bat can fly in a horizontal circle by "banking" its wings at

40. ## Physical

Tarzan, who has a mass of 85.0kg, is going to cross a gorge by swinging in an arc from a 4.0m long hanging vine. If his arms are capable of exerting a force of 1500N on the rope, what is the maximum speed he can tolerate at the tolerate at the lowest point

41. ## IPC

Element A and element B have bonded and formed compound AB. Which of the following statements is true? A) Compound AB has chemical and physical properties that are completely different from those of A and B. B) Compound AB has chemical and physical

42. ## AP Chemistry

The molar mass of a volatile liquid (one which vaporizes easily) can be determined by a the DUMAS METHOD.' In this process a small amount of the liquid (a few drops) is placed in a clean flask. The mouth of the flask is covered with a piece of foil that

43. ## PHYS

A bungee jumper (m = 61.00 kg) tied to a 45.00 m cord, leaps off a 75.00 m tall bridge. He falls to 5.00 m above the water before the bungee cord pulls him back up. What is the magnitude of the impulse exerted on the bungee jumper as the cord stretches?

44. ## physics

A pulley rotating in the counterclockwise direction is attached to a mass suspended from a string. The mass causes the pulley's angular velocity to decrease with a constant angular acceleration α = -2.2 rad/s2. If the pulley's initial angular velocity is

45. ## physics

a set of pulleys is used to lift a piano weighing 1,000 newtons. the piano is lifted 3 meters in 60 secounda. how much power is used?

46. ## biology

What happens to proteins dissolved in water when you heat it to 100 degrees celcius?

47. ## Chemistry

A solution contains an unknown mass of dissolved silver ions. When potassium chloride is added to the solution, a white precipitate forms. The precipitate is filtered and dried and then found to have a mass of 245 mg. What mass of silver was in the

48. ## Geometry

A square graphed on the coordinate plane has a diagonal with endpoints E (2,3) and F (0,-3) what are the coordinates of the endpoints of the other diagonal?

49. ## Chemistry

How much boiling water would you need in order to raise the bath to body temperature (about 37)? Assume that no heat is transferred to the surrounding environment. Imagine that your water heater has broken, but you want to take a bath. You fill your

50. ## college Chemistry

It requires 945.0 kJ/mol to break N2 molecules into atoms. Calculate the maximum wavelength of light that will still break these molecules apart. I tried converting the energy to kj and using E=hc/wavelength but that didn't give me the right answer...

51. ## math

The function D(h)=7e^-0.4(h) can be used to determine the milligrams D of a certain drug in a patient's bloodstream h hours after the drug has been given. How many milligrams will be present after 9 hours. Round three decimal places. so 7e^(-0.4 x 9) =

52. ## Physics

A flat uniform circular disk (radius = 2.10 m, mass = 1.00 102 kg) is initially stationary. The disk is free to rotate in the horizontal plane about a frictionless axis perpendicular to the center of the disk. A 40.0-kg person, standing 1.00 m from the

53. ## chemistry

Propane gas is used to heat a tank of water. If the tank contains 200 L of water, what mass of propane will be required to raise its temperature from 20 degrees C to 65 degrees C. The heat of combustion for propane is -2220 kJ/mol.

54. ## Geomtry

The scissor lift forms rhombus PQRS with PQ= (7b-5) meters and QR= (2b-0.5) meters. IF S is the midpoint of Line RT, what is the length of line RT

55. ## Physics

A block of mass M resting on a 21.5° slope is shown. The block has coefficients of friction μs=0.605 and μk=0.344 with the surface. It is connected via a massless string over a massless, frictionless pulley to a hanging block of mass 2.57 kg. What is

56. ## physics

A spot of paint on a bicycle tire moves in a circular path of radius 0.27 m. When the spot has traveled a linear distance of 2.18 m, through what angle has the tire rotated? Give your answer in radians.

57. ## English

He keeps himself in good health. (What is the part of speech of 'in good health'? An adjective phrase or an adverbial phrase? I think we can substitude 'healthy' for 'in good health'? Then, is 'in good health' an adjective phrase?)

58. ## Calculus

P(x)= -x^3+15x^2-48x+450, x>/3 is an approximation to the total profit (in thousands of dollars) from the sale of x hundred thousand tires. find the number of hundred thousands of tires that must be sold to maximize profit.

59. ## Emergancy help!!!!!!!!!

Classify the model as exponential growth or exponential decay. Identify the growth or decay factor and the percent increase or decrease per time period. y=16(1.25)^t

60. ## Physics

Water flows over a section of a waterfall at the rate of 4.9 104 kg/s and falls 36 m. How much power is generated by the falling water?

61. ## physics

A 1200 kg car is being driven up a 5:0 hill. The frictional force is directed opposite to the motion of the car and has a magnitude of f = 524 N. A force ~F is applied to the car by the road and propels the car forward. In addition to these two forces, two

Find the domain of the following rational function. R(x) = -3x^2 / x^2 + 2x - 48 (x+8)(x-6) So domain is x cannot be 8 or -6. Am I correct?

63. ## algebra

A mountain drops 90 feet over a horizontal distance of 875 feet. What is the slope of the mountain? Round your answer to two decimal places.

64. ## Chemistry

When heated, N2O4 dissociates as follows: N2O4 =2NO2 A flask initially contians .560 M N2O4. at this temperature, Kc is 4.00. what is the equilibrium concentration of NO2?

65. ## College Chemistry

When 20.0 g C2H6 and 60.0 g O2 react to form CO2 and H2O, how many grams of water are formed?

This is the question I posted about two hours ago and I worked it out two ways-could you scroll down and check it, please?If I have a roller coaster, and hill 1 height is 50cm and hill height 2 is 25 cm and the PE is .9 as it approaches the top of hill 2,

67. ## Physics ( elestic potential energy)

A spring with a force of 5.2 N/m has a relaxed length of 2.45. When a mass is attached to the end of the spring and allowed to come to rest. the vertical length of the spring is 3.57m. Calculate the elastic potential energy stored in the spring.

68. ## English

1. If it snows tomorrow, I'll not go hiking. 2. Because it snows tomorrow, I'll not go hiking. 3. Because it will snow tomorrow, I'll not go hiking. (Which one is correct of the two, #2 and #3?)

69. ## Chemistry

A 455-g chunk of iron is removed from an oven and plunged into 385g water in an insulated container. The temperature of the water increases from 27 degrees celsius to 89 degrees celsius. If the specific heat of iron is 0.449 J g^-1 degrees Celsius^-1, what

70. ## math

a computer company can sell 1000 computers if they price them at $500. The number sold will increase by 10 for every 1$ decrease in the price. The company has fixed cost of $100,000, and each computer costs$300 to produce. Find the price that will

71. ## Science

How much would a 75 kg man weigh due to the effect of gravity?

72. ## Calculus

Find the indicated absolute extremum as well as all values of x where it occurs on the specified domain f(x)= x^2e^-0.25x ; [3,10]

73. ## Calculus

a local office supply store has an annual demand for 50,000 cases of photocopier paper per year. it costs $2 per year to store a case of photocopier paper, and it costs$50 to place an order. Find the optimum number of cases of photocopier paper per order

74. ## computer science

what is the cost(most expensive,expensive or less costly)performance(powerful, most powerful or average)reliability(highly reliable or less reliable) size(large, medium or small)and installed in numbers(few, many or large) of super compters, mainframe

75. ## math

8. in the 2004 presidentail election, 4651 residents of the state of rhode island voted for candidate ralph nader. round that number of residents to the nearest thousand, to the nearest hundred, and to the nearest ten.

76. ## physics

A spot of paint on a bicycle tire moves in a circular path of radius 0.27 m. When the spot has traveled a linear distance of 2.18 m, through what angle has the tire rotated? Give your answer in radians.

77. ## chemistry

What is the mole fraction of NaOH in an aqueous solution that contains 16.9% NaOH by mass?

78. ## geometry

Two ships leave a harbor at the same time, traveling on courses that have an angle of 140 degrees between them. If the first ship travels at 26 miles per hour and the second ship travels at 34 miles per hour, how far apart are the two ships after 3 hours?

79. ## Chem

Part A : This is the first law of thermodynamics question. case 1 - the system expands and the surroundings get hotter case 2 - the system expands and the surroundgins get colder case 3 - the system contracts and the surroundings get hotter case 4 - the

80. ## college

convert 2(NH4)3PO4+3HgSO4=3(NH4)2SO4+Hg3(PO4)2 into complete ionic equation,then net ionic equation

81. ## physics

A solenoid has a cross-sectional area of 2.60 10-4 m2, consists of 600 turns per meter, and carries a current of 0.7 A. A 10 turn coil is wrapped tightly around the circumference of the solenoid. The ends of the coil are connected to a 0.8 resistor.

82. ## phy

A scuba diver and her gear displace a volume of 71.0 L and have a total mass of 64.0 kg. (a) What is the buoyant force on the diver in sea water?

83. ## college

I have 7 12 feet of rope and my friend has 3/10 of what we . need to make a jump rope hang up in our back yourd

84. ## physics

A weight lifter lits a 1250 pound barbell 2 meters in 3 seconds. How much power was used to lift the barbell

85. ## Hello

why does fluorene elute first from the column

86. ## math

A square graphed on the coordinate plane has a diagonal with endpoints E (2,3) and F (0,-3) what are the coordinates of the endpoints of the other diagonal?

87. ## Physics

Gravity on the surface of the moon is only 1 6 as strong as gravity on the Earth. What is the weight of a 33 kg object on the Earth? The acceleration of gravity is 10m/s2 . Answer in units of N.

88. ## Chemistry*

The following equation is given: S2O3 -2 + 2H +1 ---> S + SO2 + H2O [HCl] = 2 mol/L [Na2S2O3]= 0.3 mol/L what is the concentration (mol/L) of H+ if you were to add: a) 20 mL of HCL with 5 mL Na2S2O3 & with 5 mL H2O b) 15 mL of HCl with 5 mL Na2S2O3 & 10 mL

89. ## Science

Does my hypothesis match with my intro? I'm writing a lab report. Introduction: The intention of this lab is to find the pH of different household material. Boiled red cabbage juice will be used as the pH indicator. pH is the chemical potential of hydrogen

90. ## Chemistry

Organic chemistry: an attempt at synthesizing a certain optically active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of 11.0 degrees. If it is known that the specific rotation of the R enantiomer is

91. ## Physics

The clothesline is under tension when you hang from it. Why is the tension greater when the clothesline is strung horizontally than whe is hangs vertically?

92. ## physics

A solenoid has a cross-sectional area of 2.60 10-4 m2, consists of 600 turns per meter, and carries a current of 0.7 A. A 10 turn coil is wrapped tightly around the circumference of the solenoid. The ends of the coil are connected to a 0.8 resistor.

93. ## physics

What is the magnitude of the apparent weight of a 79 astronaut 5200 from the center of the Earth's Moon in a space vehicle moving at constant velocity?

94. ## physics

A bucket of mass 2.20 kg is whirled in a vertical circle of radius 1.15 m. At the lowest point of its motion the tension in the rope supporting the bucket is 28.0 N. a) Find the speed of the bucket. b)How fast must the bucket move at the top of the circle

95. ## physics

A UNIFORM RING OF MASS M AND RADIUS R IS ROLLING WITHOUT SLIPPING ON A HORIZONTAL SURFACE.FIND THE RADIUS OF CURVATURE OF TRAJECTORY TRACED OUT BY THE HIGHEST POINT?

96. ## american History

Can someone help me please. I am having a hard time answering this question. Do you think Great Britain was justified in imposing taxes on the colonies following the French and Indian War? Or do you believe the colonists had legitimate grievances regarding

Sorry for the re-post but I really need to know this, but now I just want to know if the question is right. A spring with a force of 5.2 N/m has a relaxed length of 2.45. When a mass is attached to the end of the spring and allowed to come to rest. the

98. ## Math

Classify the model as exponential growth or exponential decay. Identify the growht or decay factor and the percent increase or decrease per time period.

99. ## chemistry

calculate the concentration of a silver ion when the solubility produc constant of AgI is 10 to the power of negative 16

100. ## Physics

Two identical 19.8-kg spheres of radius 12 cm are 29.2 cm apart (center-to-center distance). (a) If they are released from rest and allowed to fall toward one another, what is their speed when they first make contact? (b) If the spheres are initially at

101. ## physics

a modified U-tube: the right arm is shorter than the left arm. The open end of the right arm is height d = 10.0 cm above the laboratory bench. The radius throughout the tube is 1.60 cm. Water is gradually poured into the open end of the left arm until the

102. ## phy

An undersea research chamber is spherical with an external diameter of 5.80 m. The mass of the chamber, when occupied, is 68400 kg. It is anchored to the sea bottom by a cable. Calculate the following. (a) the buoyant force on the chamber N (b) the tension

103. ## Algebra

How should two nonnegative numbers be chosen so that their sum is 1 and the sum of their squares is as large as possible? As small as possible?

104. ## chemistry

At 900 degrees C, Kc for the reaction is 5.1. if .050 mole of H20 and .100 mole of Fe are placed in a 1L container at 900 degrees C, how many grams of Fe3O4 are present at equilibrium?

130. ## physics

A 1.7 kg otter starts from rest at the top of a muddy incline 85.3 cm long and slides down to the bottom in 0.40 s. What net external force acts on the otter along the incline?

131. ## Calculus

find the absolute extrema if they exist as well as where they occur f(x)= x-1/x^2+3x+5

132. ## Calculus

Given the demand function q=173-5p, determine the price where demand has unit elasticity.

There are 3 parades on Cable Tv in the morning, 2 in the afternoon and 4 at night. How Many different combinations of parades can Ty watch?

134. ## Pharm Tech

how many milliliters of a 5% stock solution are needed to prepare 250ml of a 2% solution?

135. ## logarithmic differentiation

How do you find the logarithmic differentiation of y = x^6x?

136. ## math

whrit for multiplication/division facts using the numbers 3, 8, and 24. 5.what are the seven months of the year that have 31 days? 6. find the eughth multiple of six. then add one. what is the square root of the answer? 8. in the 2004 presidentail

137. ## Chemistry

the initial pressure of phosgene gas (COCl2), was 1.31 atm. it was heated, and at equilibrium the pressure of CO was found to be .547 atm. what are the equilibrium pressures of Cl2 and COCl2? CO +Cl2=COCl2 i've done it twice and keep getting the wrong

138. ## algebra 1

f(x)=[2x-1] graph the function state the range and domain.

139. ## math

How do I write 2.59 as a percent?

140. ## english

Imagine you are on a local commission appointed to study the lack of proper recreation facilities for youth in your neighborhood. Decide what facilities should be recommended. Write an appropriate resolution to be presented to your county government.

find the solutions of the equation that are in the interval [0,2pi) (a) sin2t+sint=0 (b)cost-sin2t=0

142. ## Physics

A massless spring of constant k = 91.0 N/m is fixed on the left side of a level track. A block of mass m = 0.50 kg is pressed against the spring and compresses it a distance of d. The block (initially at rest) is then released and travels toward a circular

143. ## Physics

I THINK SOMEONE HAS THIS SAME QUETION! A massless spring of constant k = 91.0 N/m is fixed on the left side of a level track. A block of mass m = 0.50 kg is pressed against the spring and compresses it a distance of d. The block (initially at rest) is then

144. ## Math

I'm really struggling with how to set this up: A company has 18 members on its management team,10 men and 8 women. There is a conference in Hawaii, and the company decided to send 5 people. If the selection of five people is random, find the following

145. ## calculus

solve (1/m)=(m-34)/2m^2

146. ## physics

img145.imageshack.us/img145/7130/picture1n.png this is basically the diagram to my question A person of mass m = 62 kg is doing push-ups as shown in the attached figure. The distances are a = 91 cm and b = 60% of l1. Calculate the vertical component of the

147. ## Calculus

Given the demand function q=173-5p, determine the price where demand has unit elasticity.

how many moles of anhydrous MgSO4 are in 2.04grams of MgSO4

149. ## Calc

Find f'(7) for f(x)=6x^ln(x)

150. ## Chemistry

50 ml of 5 M H2SO4 react with excess BaCl2 to Make 40 g of BaSO4. a.) What is the theoretical yield of BaSO4? b.) What is the Percentage yield of BaSO4

151. ## writing

Write five sentences about the role of education in successful financial planning in the spaces on the following page. Correctly use a different verb tense in each sentence. Highlight each verb in yellow and identify the tense in parentheses.

Two ships leave a harbor at the same time, traveling on courses that have an angle of 140 degrees between them. If the first ship travels at 26 miles per hour and the second ship travels at 34 miles per hour, how far apart are the two ships after 3 hours?

153. ## physics

a crate of mass m=100k is pushed at constant speed up a frictionless ramp of angel 30 by horizontal force .what are the magnitude of force

154. ## college Chemistry

It requires 945.0 kJ/mol to break N2 molecules into atoms. Calculate the maximum wavelength of light that will still break these molecules apart. I tried converting the energy to kj and using E=hc/wavelength but that didn't give me the right answer...

155. ## chemistry

express the barometric pressure in atm. 30.09Hg

156. ## college chemistry

Balance the equation in aqueous basic solution: ClO3-(aq) + Fe(OH)3(s) → FeO42-(aq) + Cl-(aq)

157. ## math

1.Drew has fifty-six rolls. seven rolls will fit on one tray. how many trays does he need to carry all of the rolls? write an equation to solve the problem. 2. one gallon is about 3.78 L.about how many liters tow gallons? use words to write the answer. to

158. ## social studies

anyone know social studies?

159. ## Physics

Suppose I apply a force to an initially motionless object. I push on the edge at an angle of 30 degrees. What is the torque on this object in terms of r and F?

178. ## math

10. $10.00-$5.46 11. 36,024 - 15,539 12. 43,675 + 52,059 19. 3.75 + 2.5 + 04 20. 42.25-7.5

179. ## math

25. is 16 a prime number? why or why not? 27. which of these numbers is a factor of 12? A 0 B 6 C 8 D 24

180. ## Literature

Please summerize and help me to understand M.H.Abrams-Structure and Style in the Greater Romantic Lyric? mail me please,thank you for your concern.

181. ## history

How does a command economy affect a worker's life?

182. ## chemistry

in an element on the periodic table, which number tells you the how many electrons are in that element??

183. ## math

John who is an amateur golfer spends 3 hrs a day practicing golf. What percentage of his waking hours does John spend practing golf if he sleeps 9 hours a day. PLEASE SHOW WORK.

184. ## Econ

Explain how an economist could use the slope of the yield curve to analyze the probability that a recession will occur and why the spread may matter.

185. ## VB Programming

Haw to create a web application for a vb auto center project from chapter 4.

186. ## Physics

A roller-coaster vehicle has a mass of 506 kg when fully loaded with passengers (see figure). (a) If the vehicle has a speed of 22.0 m/s at point A, what is the force of the track on the vehicle at this point? (b) What is the maximum speed the vehicle can

187. ## chemistry

If you have 137.8 mL of a 38.4% aqueous solution of ethanol, what volumes of ethanol and water are in the solution?

188. ## chemistry

What volume of a 3.70 M KI stock solution would you use to make 0.400 L of a 1.25 M KI solution?

189. ## Algebra

The area of a rectangular athletic field is represented by the expression 48x^4 + 32x^3 - 72x square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense Òlength times widthÓ) of the athletic field. Include

190. ## Physics

Gravity on the surface of the moon is only 1 as strong as gravity on the Earth. 6 What is the weight of a 30 kg object on the Earth? The acceleration of gravity is 10 m/s2 . Answer in units of N.

191. ## science

an air sample contains 0.046% CO2 if the total pressure is 760mmHg what is the partial pressure of CO2

192. ## math algebra

how would i do this problem elina and teresa raced on their bikes to the library after school. they both left at 3:00 pm and bicycled along the same trail elina rode at the speed of 12 miles an hour and teresa rode at the speed of 9 mph. elina got there

193. ## english

it is not unusual for writers to confuse advers and adjectives how did the material in my writinglab help reduce the possibility of confusion describe the strategies you have developed to avaoid confusing the use of adverbs and adjectives in the future

194. ## English

It "accepted" the bride into the family. Is accepted an action verb physical or mental? It is referring to a letter

195. ## 11th Grade AP English

i have to wright an essay tomorro comparing The Great Gatsby and The Color of Water. Can anyone help me get some ideas/topics on what i should wright about?

Find a degree 6 polynomial with - 8 as a root, no other roots, and in which the coefficient of x^6 is 16. Assume that all (non-constant) factors of the polynomial correspond to real zeroes.

197. ## Earth Science

What are the primary heat absorbing gases in the atmosphere? What wavelength of radiation do they absorb?

198. ## chemistry

One way that safety enters into specifications is to specify the composition of a vapor in air that could burn if ignited. If the range of concentration of benzene in air in which ignition could take place is 1.4 to 8.0 percent, what would be the

199. ## ap calculus

A particle moves along a straight line with displacement s(t), velocity v(t), and acceleration a(t). Show that a(t) = v(t) dv/ds.

200. ## logarithmic differentiation

How do you find the logarithmic differentiation of y = x^-cos x ?

201. ## grammar

What are the nouns in this sentence? 1. Every section of the United States has scenes of natual beauty. 2. Southern coastal cities are proud of their sandy beaches. 3. The citizens of every state take pride in ther charm of their won state.

202. ## Music Theory

Explain to me how to get information on the computer about higher pair notes

203. ## PHYSICS

If you hold a coin above your head while in a bus that is not moving, the coin will land at your feet when you drop it. Where will it land if the bus is moving in a straight line at a constand speed? Explain.

204. ## chem 106 xtra credit!!**

what is EDTA and why is it added to salad dressings and many other processed food stuffs?

205. ## science

which of the following biomes would receive the most yearly rain? A desert B rainforest C grassland D coniferous forest

206. ## algebra

can you tell me the process of how to simply problems like this so i don't have to keep asking? simplify: (2x^2y)(-5x^-5y^6) (5y)^3

207. ## MAT 115

Julio works as a quality control expert in a beverage factory. The assembly line that he monitors produces about 20,000 bottles in a 24-hour period. Julio samples about 120 bottles an hour and rejects the line if he finds more than 1/50 of the sample to be

208. ## Physics

A 3 kg ball is dropped from the top of a cliff. At the same time, a 9 kg ball is fired straight down from the top of the cliff. Ignoring air resistance, what can we say about their accelerations after being released?

209. ## Physics

There is a vertical tension at the top of a 4 m long ladder holding it at an incline. The bottom of the ladder is touching the floor, which exerts a normal force. You are standing 1 meter from the top of the ladder. What happens to the tension as you walk

210. ## english

Plot is closely related to _____. authenticity?

211. ## ela

i have to draw globe thetre but i have no idea how to draw. they give me some describsion:the stage was 4-5 feet high,surrounded by railing,. the celing above the stage, supported by two colums,was painted with the sun,moon,stars and zodiac sign and more

212. ## algebra

x/14+12=3x-8.5

213. ## algebra

x/14+12=3x-8.5

214. ## Math

The following function f is one-to-one; find its domain and range. f(x) = 5 / x+3 Domain = x cannot be -3 Range= I do not know how to find this.

215. ## math

Stephen said that the ratio of his mortgage to the sales price of his house is 7 to 6. Is this reasonable? Explain your answer. I said yes it is reasonable. Stephen would pay 7 dollars for every 6 he borrowed. We don't know the sales price or how long the

216. ## college chemistry

Which of the following statements is not true when a human is subjected to cold temperatures? Answer a.blood vessels dialate to help dissipate heat b.shivering causes the muscles to generate more heat c.blood vessels in the extremities constrict to reduce

217. ## chemistry

If you have 137.8 mL of a 38.4% aqueous solution of ethanol, what volumes of ethanol and water are in the solution?

218. ## fractions word problems fifth gradee

I have fraction word problem made from a recipe. If it takes 2 1/2 cups of oatmeal to make 30 cookies. How much oatmeal will it take to make 120 cookies?

219. ## Calculus

Find all extrema, inflection points, and asymptotes where applicable f(x)= 2x^3-12x^2+18x I got 0, 8 for extrema 2, 0 for I.P and I don't know how to find asymptotes

220. ## Geometry

MNPQ is a rhombus. The measure of angle MRQ is (13t-1) degrees, and the measure of angle PQR is (7t+4) degrees. what is the measure of angle PQM?

221. ## social studies

I need a web- cite for a essay on the history and how Pioneer wooden toys are made.I've looked but can't find a cite on how they are made.

222. ## Math

Using the digit 9 and 1. Write a fraction less than 1/10

223. ## algebra 1

help me please What is the smallest solution to the inequality 4 (x -1) > 16?

224. ## probability

A new test for detecting a disease has been developed. Medical trials show that 92% o patients with the disease show a positive test result. If 4% of the population have the disease, determine the probability (to 3 decimal places) that: a.) a radnomly

225. ## math

The scissor lift forms rhombus PQRS with PQ= (7b-5) meters and QR= (2b-0.5) meters. IF S is the midpoint of Line RT, what is the length of line RT

226. ## math

MNPQ is a rhombus. The measure of angle MRQ is (13t-1) degrees, and the measure of angle PQR is (7t+4) degrees. what is the measure of angle PQM?

227. ## math

The distance from B to D is approximately (x+10) feet, and the distance from A to C is approcimately (2x-5.3) feet. what is the approximate distance from A to C?

228. ## Math

How do you change a fraction into a decimal besides the way of dividing the numerator by the denominator?

229. ## physics

An object is moving to the right at a speed of 4 m/s. Four forces(10N North, 10N South, 20N Left, 20N Right) are applied to the object at the same time. What will be the object's speed in m/s after the forces are applied?

230. ## Discrete Math

7.A group has 9 women and 7 men. d. Suppose 2 members of the group refuse to work together. How many subgroups of 5 can be chosen 8. In how many ways can 16 people be seated: a. In a row, if 4 of the 16 do not want to sit next to one another b. In a row,

231. ## science

Evolucion and origen de la vida

232. ## Math

How do I write the Symmetric Equation of a line given the following parametric equations: (where t is a scalar) x=0t y=0t z=1+1t I know normally I would solve each equation for t and set the equations equal to one another. However, I can not solve for t in

233. ## math

the width of the field is 3/4 the length and the radius of the center circle is 1/10 the width.what are the dimensions of the soccer field,given the perimeter is 420m?

234. ## physics

i have two kinetic energies and my homework asks for the ratio, K2/K1 Do i just divide them?

235. ## Physics

A string is under a tension of 700.0 N. A 1.5 m length of the string has a mass of 4.5 grams. What is the speed of a transverse wave of wavelength 0.50 m in this string? What is the frequency of the wave?

find the solutions of the equation that are in the interval [0,2pi) (a) sin2t+sint=0 (b)cost-sin2t=0

237. ## chemistry

Answers for copper has a density of 8.92g/cm3 and nickel has a density of 8.90 . which one is denser

238. ## physics

An object is moving to the right at a speed of 4 m/s. Four forces(10N North, 10N South, 20N Left, 20N Right) are applied to the object at the same time. What will be the object's speed in m/s after the forces are applied?

239. ## Math

ý22xn is between 80 and 85 what is n?

240. ## chemistry

What volume of a 3.70 M KI stock solution would you use to make 0.400 L of a 1.25 M KI solution?

241. ## chemistry

A lab technician determines the boiling point elevation of an aqueous solution of a nonvolatile, nonelectrolyte to be 1.95°C. What is the solution's molality?

242. ## algebra 1

heip me I tried everything 4(x -1) > 16

243. ## chemistry

How do u solve this calculate the mass of (NH4)2SO4 if 16 g H is used

244. ## Algebra, finding the intercept, help?

How do you find the x and y intercept of 3x+0.5y=6? I know you set x and y to 0.. and then divide by the other variable's number. I think? Could somebody explain how to find the intercepts of this problem? Thank you -Allyson

245. ## Calc

Find the f'(3) of F(x)=9(sin(x))^x

246. ## math

3x + 4 = 5x - 7

247. ## derivative

How do you find the derivative of F(x) = root5(3 + 5 x + x^3)?

248. ## logarithmic differentiation

How do you find the logarithmic differentiation of y = x-cos x ?

249. ## calculus

(10/((n^2)-1)+((2n-5)/(n-1))=(2n+5)/(n+1)

250. ## math

John who is an amateur golfer spends 3 hrs a day practicing golf. What percentage of his waking hours does John spend practing golf if he sleeps 9 hours a day. PLEASE SHOW WORK.

251. ## Language

we are reading a book called the children of wilesden lane and i don't have the book so i don't know what "the last paragraph of chapter three" is PLEASE HELP!!!!

252. ## grammar

need help editing and grammar for this journal Journal # 4 David Renaldo Monday, November 1st 2013 These past few weeks have been chaotic for me. I started to believe that my parents were starting to give me the independence which I think I deserve. Now I

253. ## Chemistry

I need to determine the "percentage composition unknown" whatever that is. My current data: a) mass of test tube and foil cover: 7.5323 g b)temp of water bath: 375.65 K c) mass of test tube and foil and gas as sample: 7.5423 g d) barometric pressure:

Find the domain of the following rational function. R(x) = -3x^2 / x^2 + 2x - 48 (x+8)(x-6) So the domain is x cannot be 8 or -6. Am I correct?

255. ## US History

25. The views of President Hoover and President Roosevelt on the best ways to solve the problems of the depression. Describe some actions they took to back up these views. (The first part of the question doesn't make sense to me, but that's how it's

256. ## chemistry

Which term in the following reaction would not be included in the equilibrium expression? 2 Na3PO4 (aq) + 3 MgCl2 (aq) → 2 Mg3(PO4)2 (s) + 6 NaCl (aq)

301. ## spanish

How does this sound as a restaurant review? Mi familia comimos en ese restaurante ayer. En ese restaurante Modern Apizza siempre serve pizza. Se hacen con al horno de ladrillo. Pides pizza, bebidas, ensaladas, y el pan. Pedimos ensalada de antipasto

what is the best parking space/shortest that would take the from store 1 to store 2 and back to the car?use the following information: -the distance between store 1 to store 2 is 25 yds wide. -driveway between the sidewalk and parking lot is 10 yds this

303. ## science

what is the structure formula for the acrylate ion?

find the solutions of the equation that are in the interval [0,2pi) 2-cos^2x=4sin^2(1/2x)

305. ## Algebra

Hi. I have an answer for this and just need to confirm it. 2x+5(less than or equal to sign here)x + 6. I minused the x's on both sides of the greater then equal to sign; x +5 (greater then or equal to sign) = 6; x +5-5 (the sign here) 6-5 gives me x

306. ## math

for a sample of n = 75, find the probaBILITY OF A SAMPLE MEAN BEING BEIGN GREATER THAN 221 IF U = 220 AND O = 3.9

307. ## Algebra1

Predict the weight of a man that is 84 inches tall.

308. ## MATH

THE MEAN PRICE OF DIGITAL CAMERAS AT AN ELECTRONIS STOR IS $224, WITH A STANDARD DEVIATION OF$8. RANDOM SAMPLES OF SIZE 36 ARE DRAWN FROM THIS POPULATION AND THE MEAN OF EACH SAMPLE IS DETERMINED.

309. ## algebra1

Write the slope intercept form for a line of fit.

310. ## French

Can you check these thanks. Le métro Directions: Completez 1. Il y a dix tickets de métr dans un ----------. Answer: carnet 2. On peut acheter des tickets au ----------- ou au -------------. Answer 1: guichet Answer 2: distribueur automatique 3. Les

311. ## science

what is the walker circulation of normal & El Nino? help me please

312. ## Algebra

..Help me with these problems.. x/4=2x+3/15 21/y-8=3 11u/6=u+14

313. ## American Government

Is this statement true: The Secretary of Defense could never become President.

314. ## math

2/9 as percent would I dived 9 into 2? Which would become .2 repeating right? Then what???

315. ## agricultural science

how to prepare accommodation for a mother and young cattle?

316. ## agricultural science

how to prepare accommodation for a mother snd young poultry

317. ## physics

Calculate the acceleration due to the rotation of the Earth of a person in a location 48° northern geographical latitude. Use REarth = 3,678 km for the value of the radius of the Earth.

318. ## art/101

need an example of appendix a

319. ## Science

When learning about types of energy what are the types of energy for: A. a lit match, yo-yo, bicycle, trampoline, apple, lightbulb, cooker, moving bullet, nuclear bob, hairdryer, solar panel,campfire, car, human, tv, mobile phone, thanks

320. ## social studies

why did Fred Riggs revisit his theory of prismatic society?

321. ## college

If 75 grams of ice at 0 degrees celsius were added to 1.5 Liters of water at 75 degrees celsius, what would be the final temperature?

322. ## Math - determinants

| x 5 2 | |-6 4 1 | = x(squared) + 22x - 1 | 3 1 x | Solve for x.

323. ## science

what is the walker circulation of normal & El nino conditions? help me

325. ## history

aren't sustainable and renewable kind of the same thing?

326. ## math

write for multiplication/division facts using the numbers 3, 8, and 24. 5.what are the seven months of the year that have 31 days? 6. find the eughth multiple of six. then add one. what is the square root of the answer?

327. ## English

Can you please tell me if I made any mistakes in the following sentences? Thank you very much for your help. Thank you for your corrections. Can you please check the grammar in the following letter, please? 1) Do you think you can help me find a school in

328. ## Education

what is the difference between terminating a teacher and nonrenewing a teacher's contract

329. ## math

21.a. which of these number is a multiple of 10? A 35 B 40 C 45 D 101 b. how can you fine the answer for part a just by looking? 22.a. A dime is what fraction of a dollar? b. A dime is what percent of a dollar

330. ## Psychology

Why do you believe that researchers would want to see if there isa correlation rather than just fully testing ech variable?

331. ## english

In Pamela, or Virtue Rewarded, which some consider to be the first English novel, Pamela's master attempts to seduce her. How does the story end?

332. ## ALgebra

a swim club requires a $120 membership, plus$4 each swim. How much would a person pay to swim 35 times?

333. ## Math

81 is 56% of what?

334. ## Pearson

Calculate the acceleration due to the rotation of the Earth of a person in a location 22° northern geographical latitude. Use R Earth = 3,680 km for the value of the radius of the Earth.

335. ## math

0.70 as a percent?

336. ## US History

How did Britain's location help that nation to avoid a German invasion during World War II? Thanks -MC

337. ## English: Vocab

Unctuous - full of unction; especially : revealing or marked by a smug, ingratiating, and false earnestness or spirituality I don't understand this. Unction means : use of oil or ointment Could someone explain this in simpler words.

338. ## Finance

Johnson Alarm Systems had 800,000 of retained earnings on December 31, 2008. the company paid common dividends of 60,000 in 2008 and had retained earnings of 640,000 on December 31, 2007. how much did Johnson earn during 2008, and what would earnings per

339. ## calculus

Find all critical numbers: (x^2+12)(9-x^2)?

340. ## spelling

what is the correct abc order for sister's sisters sisters'

341. ## English

How did boy come into modern English

342. ## science

what is the walker circulation of normal & El nino conditions? help me please!!!!!!!!!!!!!!!!

343. ## TEACHING

HOW DO DUE PROCESS RIGHTS DIFFER FOR PROBATIONARY AND TENURED TEACHERS

344. ## math

if 1790 maga watts of power,out of 3000 mega watts generated by a power utility, reach the destination, what percentage of the generated power reaches its destination. please show work

345. ## Algebra

The area of a rectangular athletic field is represented by the expression square meters. Write an algebraic expression to represent one possible set of dimensions (in the sense Òlength times widthÓ) of the athletic field. Include correct units with your

346. ## Social Studies

Which one from the 13 colonies, can I write the most and interesting, eyecatching facts about ?????

I am a being from another planet, please explain to me which is alive: a clock or a fish? Compare the two, similarities and differences.Can you help me answer this question ? thank you.

348. ## Physics

A man weighs 1220 N on Earth. What would he weigh on Jupiter, where the free-fall acceleration is 25.9 m/s2? The acceleration of gravity is 9.8 m/s2 . Answer in units of N.

349. ## Chemistry

The only strongly electropositive metal that will not form a saline hydride is what element?

350. ## calculus

solve (12/t)+t-8=0 (solving rational equations)

351. ## college

creating a slide on debunking gender misconception any tips

389. ## English

1. The car runs on gas. 2. The car runs on gas and electricity. (Are both grammatical? Do we have to use 'on'? Can't we use other prepositions instead of 'on'?)

390. ## US History

21. Explain how Roosevelt might have used data from graphs that showed the United States' Economy (GNP and Personal Income) during the 1932 presidential campaign. I need help answering this. Thanks -MC

391. ## Porter model

Identify the competitive forces in Porterâ€™s model. What affect might these forces have on a business? What can a business do to respond to these forces?

392. ## Algebra

How many total Roots are in this polynomial equation? (x-4)^5(x^2-11)(x^2+49)=0

393. ## Europe

this time of new ideas and rediscovery is called the....?

394. ## physics

find the magnitude and direction of a combination of 48N east and 14N north.

395. ## Math

2 2/3 + -1 1/2=

396. ## Math

-2 3/4 - 6 5/9=

397. ## pre-algerbra

I have been working on this problem for an hour and a half! I keep getting 1.33 but I know that's not right!! Jim drove the 120 miles to grandmothers house in 3 hours. He increased the speed by 10 miles per hour on the way home. How long did it take him to

What happens to a rollercoaster's motion in terms of energy when it goes over a second hill that is higher than the first hill.I think it is because the kinetic energy does not have the momentum so when converted into PE, it can't make it over a higher

399. ## algebra

Write the equation for this situation: the value, v, in hundreds of dollars, of Bob’s stamp collection is 12 dollars more than 1/3 of the age, t (in years). Then graph the equation and use the graph to determine the value of Debbie’s coin collection if