1. Social Studies

    *** = what I think the answer is.. Please check my answers! 1. What was the result of the development of the Silk Road? Select all that apply. A. It brought new ideas such as Buddhism into China.*** B. It enabled the Shang to expand Chinese territory. C.

    asked by UNKNOWN on November 7, 2018
  2. phYSICS

    the process of charging a conductor by bringing it near another charged object and then grounding the conductor is called... a) charging by contact b) induction c) charging by polarization d) neutralization which one of the following statements is true

    asked by TS on March 29, 2011
  3. Physics

    Forces F1=7.50N and F2=5.30N are applied tangentially to a wheel with radius 0.330 m. What is the net torque on the wheel due to these two forces for an axis perpendicular to the wheel and passing through its center? It depends upon whether or not the

    asked by Karla on March 27, 2007
  4. Physics

    In the process of changing a flat tire , a motorist uses a hydraulic jack. She begins applying a force of F1=8.6N to the input piston. As a result, the output plunger applies a force of F2=305N to the car. The height difference between the input piston and

    asked by Sami on December 1, 2011
  5. Calculus

    The tank shown is full of water. Given that water weighs 62.5 lb/ft3, find the work required to pump the water out of the tank. The tank shown is a hemisphere with r = 5 ft. The water is to be pumped out at the top. First I solved for ri, ri / (5 - xi) = 5

    asked by COFFEE on June 22, 2007
  6. Physics

    12 kg wagon is being pulled at an angle of 38o above horizontal. What force is applied to the wagon if it accelerates from rest to a speed of 2.2 m/s over a distance of 3.4 m? Is this question a typo? Am I supposed to solve for force or work? Physics -

    asked by silverback - sorry Repost for Damon on January 12, 2016
  7. Physics

    A dart is thrown at a dartboard 3.90 m away. When the dart is released at the same height as the center of the dartboard, it hits the center in 0.555

    asked by Mike on June 6, 2016
  8. Physics

    A 71.1 kg man steps out a window and falls (from rest) 1.24 m to a sidewalk. What is his speed just before his feet strike the pavement? If the man falls with his knees and ankles locked, the only cushion for his fall is a 0.500 cm give in the pads of his

    asked by Anonymous on March 9, 2013
  9. Physics

    A 73.3 kg man steps out a window and falls (from rest) 1.09 m to a sidewalk. What is his speed just before his feet strike the pavement? 4.62 m/s If the man falls with his knees and ankles locked, the only cushion for his fall is a 0.510 cm give in the

    asked by Brett on March 5, 2012
  10. College Physics

    A spring fixed at one end is compressed from its relaxed position by a distance of 0.20 m. See the graph of the applied external force, Fx, versus the position, x, of the spring. (a) Find the work done by the external force in compressing the spring 0.17 m

    asked by Megan on October 13, 2009
  11. physics

    A fighter pilot is exposed to an acceleration of 3g in the horizontal direction during takeoff. Knowing that 1g=9.8 m/s2 and that the mass of the fighter pilot is 63.6 kg, what force (in Newtons) does the fighter pilot experience in the horizontal

    asked by Morgan on February 25, 2015
  12. Physics

    A 20 kg table initially at rest on a horizontal floor requires a 136 N horizontal force to set it in motion. Once the table is in motion, a 71 N horizontal force keeps it moving at a constant velocity. What is the coefficient of kinetic friction between

    asked by Mackenzie on January 4, 2012
  13. physics

    A sports car of mass 1300 kg (including the driver) crosses the rounded top of a hill (r = 86 m) at 23 m/s. Determine the normal force exerted by the car on the 74 kg driver. Determine the car speed at which the normal force on the driver equals zero.

    asked by Anonymous on February 22, 2010
  14. physics

    A 14.0-kg chair is at rest on a flat floor. The coefficient of static friction between the chair and the floor is 0.450. A person tries to move the chair by pushing on the chair with a force directed at an angle of 30„a below the horizontal. What is the

    asked by mike on December 2, 2012
  15. Physics

    An ideal spring hangs vertically from the ceiling. When a 1.0 kg mass hangs from the spring it is extended 5.0 cm from its relaxed length. A downward external force is now applied to the mass to extend the spring an additional 10 cm. While the spring is

    asked by Joane on April 10, 2016
  16. physics

    A 14.0-kg chair is at rest on a flat floor. The coefficient of static friction between the chair and the floor is 0.450. A person tries to move the chair by pushing on the chair with a force directed at an angle of 30„a below the horizontal. What is the

    asked by mike on December 2, 2012
  17. college physics

    To stretch a spring 7.00 cm from its unstretched length, 16.0 J of work must be done. What is the force constant of this spring? What magnitude force is needed to stretch the spring 7.00 cm from its unstretched length? How much work must be done to

    asked by jon on September 21, 2010
  18. physics

    Which of the following ; if either, produces the larger change in kinetic energy; a force of 6 newtons acting through a distance of 3 meters or a force of 3 newtons acting through a distance of 6 meters.

    asked by Mario on February 16, 2016
  19. physics 911

    A force ~F = Fx ˆı+Fy ˆ| acts on a particle that undergoes a displacement of ~s = sx ˆı + sy ˆ| where Fx = 10 N, Fy = −1 N, sx = 5 m, and sy = 3 m. Find the work done by the force on the particle. Answer in units of J b) Find the angle between ~F

    asked by physics on October 15, 2011
  20. precalc

    a sled is tied to a rope that makes an angel of 32° with the level ground. if the rope is pulled with 32 kg of force, how much of this force actually pulls the sled over the level ground?

    asked by yani on October 5, 2015
  21. Physics Problem - Please Help!

    Okay, here's the problem: During a football game, the quarterback rolls out to his right with two huge linebackers in close pursuit. An instant before the linebackers bury him at the 50 yard line (46-m), he releases a towering pass down the sideling. The

    asked by Kira on November 5, 2006
  22. Physics

    How do you find acceleration and Fnet for a diagram containing only one object with a mass, like say 10kg, and two arrows going in the opposite directions(horizontally) with thier tips touching each side of the object. **NOTE: there are no other numbers

    asked by Pamela on June 7, 2007
  23. Physics

    During a picnic, you and two of your friends decide to have a three-way tug-of-war, with three ropes in the middle tied into a knot. Roberta pulls to the west with 412 N of force; Michael pulls to the south with 580 N. In what direction and with what

    asked by mymi on October 24, 2011
  24. physics EM

    WOW this problem is making me mad. I know force between two wires is mu*I1*I2*L/2pi*d. Ive used this and tried to find the magnitude but it says its wrong. What Am i doing wrong? I made sure to subtract the two forces one going up and one going down. There

    asked by Spencer on March 31, 2008
  25. Physics

    1. Determine the specific heat of a certain metal if a 450-g sample of it loses 34,500 joules of heat as its temperature drops by 97degC. 2. The temperature of a 55-g sample of a certain metal drops by 113degC as it losses 3,500 J of heat. What is the

    asked by Hershey on November 21, 2014
  26. Physics

    1. Determine the specific heat of a certain metal if a 450-g sample of it loses 34,500 joules of heat as its temperature drops by 97degC. 2. The temperature of a 55-g sample of a certain metal drops by 113degC as it losses 3,500 J of heat. What is the

    asked by Hershey on November 19, 2014
  27. physics

    A uniform beam of length 7.60 m and weight 3.90 102 N is carried by two workers, Sam and Joe, Sam=1.00m Joe=2.00m between both Joe and Sam there is 7.60m (a) Determine the forces that each person exerts on the beam. F_Sam = N F_Joe = N (b) Qualitatively,

    asked by kay on November 2, 2008
  28. PHYSICS

    On vacation, your 1400-kg car pulls a 520-kg trailer away from a stoplight with an acceleration of 2.00 m/s2 . A: What is the net force exerted by the car on the trailer? Assume that the positive x axis is directed toward the direction of motion. F = N

    asked by LISA on February 25, 2017
  29. Calc

    A car is moving at 40 mi/h along a straight line when the driver sees a light turn red. She hits the brakes when she is 100 ft from the light and decelerates at the rate of 16 ft per second squared. How far does she travel before stopping? Choose the whole

    asked by Sean on January 20, 2013
  30. MATH

    A frustrated office worker throws his laptop out of his business’s high-rise office building. The height, h, in meters of the laptop above the ground at t seconds can be modelled by 2 h(t) 125 5t . Estimate the instantaneous rate at which the laptop hits

    asked by ROBIN on July 19, 2013
  31. Physics 11

    Mark Ji shoots a 40gram arrow straight up in the air at 30m/s during a home archery training session a. assuming no air resistance, what is the maximum height that the arrow could reach? b. How fast is the arrow going when it hits the ceilings at a height

    asked by Andy on October 28, 2009
  32. PHYSICS

    A .01kg bullet traveling at 800m/s hits a disk with a radius of R=.1m at R/2 and leaves with a speed of 400m/s. what is the angular speed of the disk right after? (omega) I used conservation of momentum and the rotational inertia for a disk and found omega

    asked by Taylor on November 30, 2010
  33. Physics

    A hot-air balloon is rising upward with a constant speed of 2.27 m/s. When the balloon is 9.14 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground? I solve

    asked by Shawn on September 10, 2013
  34. Physics

    A monkey throws a banana horizontally from the top of a tree. The banana hits the ground 3.03 seconds later and lands d = 30.9 meters from the base of the tree. 1. What was the resultant velocity of the banana as it hit the ground? magnitude = ? m/sec. 2.

    asked by Mack K on October 3, 2014
  35. Calculus

    A pomegranate is thrown from ground level straight up into the air at time t=0 with velocity 128 feet per second. Its height in feet at t seconds is f(t)=16t^2+128t. Find the time its hits the ground and the time it reaches its highest point.

    asked by Anonymous on January 30, 2012
  36. Physics

    A rescue helicopter drops a package of emergency ration to a stranded party on the ground. If the helicopter is travelling horizontally at 40m/s at a height of 100m above the ground, what are the horizontal and vertical component of the velocity of the

    asked by Ramla on September 12, 2015
  37. Physics

    A 4.8‒kg block on a 39° inclined plane is acted on by a horizontal force of 46 N as shown below. The coefficient of kinetic friction between the block and the plane is 0.33. (a) What is the acceleration of the block if it is moving up the plane? (b)

    asked by Chrxeyshthoufov on February 23, 2014
  38. physics

    The cavle on an elevator is what pulls the elevator up, and allows it to come down safely. The mass of the elevator is 1400 kg. If the elevator starts from rest and is pulled upwards with a constant tension of 18 kN, what will its speed be after moving 6m?

    asked by Anonymous on October 7, 2007
  39. physics

    A cyclist is riding in the positive horizontal direction at 14.8 m/s on a horizontal level surface. He encounters an air resistance force of 50 N. The actions on the pedals by the cyclist cause a backward force of 73 N to be exerted by the rear wheel on

    asked by Anonymous on February 7, 2012
  40. physics

    two movers have to lift a refrigerator into a truck. one of the movers wants to life the refrigerator vertically, but the other mover wants to roll it up a ramp by applying a force parallel to the ramp. assume the height of the truck is 1.5m, the length of

    asked by Anonymous on November 3, 2009
  41. University Physics

    A rock is tossed straight up with an initial speed of 20 m/s. When it returns, it fall into a hole that is 8.0 m deep. What is the velocity of the rock (in m/s) when it hits the bottom of the hole? Use -9.80 m/s2 for the local acceleration due to gravity

    asked by Me on September 12, 2011
  42. Physics

    A rescue plane spots a person floating in a lifeboat 55 m directly below and releases an emergency kit with a parachute. The package descends with a constant vertical acceleration of 6.91 m/s. If the horizontal speed of the plane was 70.6 m/s, how far is

    asked by Babygirl on September 13, 2018
  43. Physics

    A car moving at some speed hits the brakes and skids to a stop after 11 m on a level road. If the coefficient of friction for the road conditions of wet asphalt is 0.53, what was the car's original speed before braking? I have used multiple modes to find

    asked by Kirstie on October 22, 2014
  44. Physics

    A truck of 5000kg hits a car of 1500kg at an intersection. After the collision, both vehicles remained glued together and slid over a distance of 30 meters before coming to a halt. Knowing that the coefficient of kinetic friction between both vehicles and

    asked by Raf on February 4, 2012
  45. physics

    A truck of 5000kg hits a car of 1500kg at an intersection. After the collision, both vehicles remained glued together and slid over a distance of 30 meters before coming to a halt. Knowing that the coefficient of kinetic friction between both vehicles and

    asked by Raf on February 5, 2012
  46. Physics

    A .22 rifle bullet, traveling at 373m/s, strikes a block of soft wood, which it penetrates to a depth of 0.125m. The block of wood is clamped in place and doesn't move. The mass of the bullet is 1.90. Assume a constant retarding force.How much time is

    asked by Anonymous on February 8, 2010
  47. Physics

    A block whose weight is 34.0 N rests on a horizontal table. A horizontal force of 27.2 N is applied to the block. The coefficients of static and kinetic friction are 0.600 and 0.472, respectively. Will the block move under the influence of the force, and,

    asked by Samantha on November 7, 2013
  48. chemistry

    A tragedy hits a small town. The elementary school explodes into flames trapping several classes of second graders. Because the volunteer fire department will take too long to get there, teachers and classified staff remove all the children to safety

    asked by phil on November 8, 2010
  49. general

    A tragedy hits a small town. The elementary school explodes into flames trapping several classes of second graders. Because the volunteer fire department will take too long to get there, teachers and classified staff remove all the children to safety

    asked by Chloe on March 17, 2011
  50. physics

    1) Two boxes are placed are placed side by side on a frictionless surface so that they touch each other. Box A has a mass of 4 kg. Box B has a mass of 12 kg. A constant force of 24 N is applied to box A. What force does box A exert on box B?

    asked by pat on November 10, 2009
  51. Physics

    A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A constant tangential force of 300 N applied to its edge causes the wheel to have an angular acceleration of 1.072 rad/s2. (a)

    asked by anonymous on December 5, 2012
  52. Physics- Elena please help!

    A large grinding wheel in the shape of a solid cylinder of radius 0.450m is free to rotate on a frictionless, vertical axle. A constant tangential force of 180 N applied to its edge causes the wheel to have an angular acceleration of 0.870 rad/s2. (a) What

    asked by Anonymous on November 6, 2012
  53. physic

    A particle is pushed horizontally by a constant horizontal force of magnitude F, which starts from the rest at x=0 in the positive ݔ direction. During the movement, it is also acted by the air resistance force that equivalent to bv, where b is the

    asked by mad on June 18, 2016
  54. English

    1. He narrowly escaped being drowned. 1-1. He narrowly escaped from being drowned. 1-2. He escaped from the thief. 1-3. He tried to escaped from the angry lion. 1-3. He could not escape from his father. 2. He dropped the ball-point pen from the table. 2-1.

    asked by John on November 24, 2008
  55. Physical Science

    A player uses a hockey stick to increase the speed of a 0.200kg hockey puck by 6 m.s in 2 seconds. A) How much did the hockey puck accelerate? B) How much force was exerted on the puck? C) How much force did the puck exert on the stick?

    asked by Sweet on February 7, 2011
  56. Science

    A+force+of+12+N+pulls+a+block+of+mass+3.5kg+through+a+rope+of+mass+0.5kg.+The+block+is+resting+on+a+horizontal+frictionless+surface.+what+is+the+force+of+reaction+exerted+by+the+block+on+the+rope

    asked by Shantanu on December 19, 2016
  57. physics

    Consider a 1kg mass at rest at the equator.Because of the earths rotation , the mass experiences a centripetal acceleration. a)Draw free body diagram of mass b)Find centripetal force acting in the mass c)Compare apparent weight and true weight d)what

    asked by Sandra on February 24, 2011
  58. Sensory writing

    I struggle with sensory writing. We are to write a sense of place story based on what we saw at a site we were designated to go view.. Mine was a ballet class. Anyone mind proofreading my story. A class located in a big squared lukewarm studio with nearly

    asked by Blaze on February 27, 2014
  59. physics

    In the figure here, a box of Cheerios (mass mC = 1.4 kg) and a box of Wheaties (mass mW = 3.3 kg) are accelerated across a horizontal surface by a horizontal force applied to the Cheerios box. The magnitude of the frictional force on the Cheerios box is

    asked by adek on October 16, 2013
  60. science

    A stone is dropped from a balloon going up with a uniform velocity of 5.0 m/s. If the balloon was 50 m high when the stone was dropped, find its height (in meters) when the stone hits the ground. Take g = 10 m/s2 (A) 50 (B) 58 (C) 68 (D) 78.5

    asked by sam on February 3, 2017
  61. Math

    an object is thrown upward from a height of 70 feet. t second after it is released, the object is h=-16t^2+40t+70 feet above the ground. how many seconds does it take until the object hits the ground?

    asked by Hayley on December 2, 2014
  62. Science

    A Block rests on a horizontal surface.The normal force is 20 N.The coefficient of static friction between the block and the surface is 0,40 and the coefficient of dynamic friction is 0,20. What Is the magnitude of the frictional force exerted on the block

    asked by Lesego on February 2, 2015
  63. physics

    An hydraulic press has an input cylinder of 2cm diameter and an output cylinder of 6cm diameter. Find the force exerted by the output piston when a force of 20N is applied to the input piston.

    asked by trust on December 26, 2015
  64. physics

    10. A 3 kg block moves up a 40° incline with constant speed under the action of a 26N force acting up and parallel to the incline. What magnitude force must act up and parallel to the incline for the block to move down the incline at constant velocity?

    asked by Anonymous on March 20, 2018
  65. Physics

    A mass of 9.8 kg is moving in the positive x direction at 16.6 m/s and collides in a perfectly elastic, head on collision with a mass of 12.7 kg at rest. The same mass of 9.8 kg in the positive direction at 16.6 m/s also collides with the mass of 12.7 kg

    asked by Kimmy on November 11, 2014
  66. physics

    Given that the distancef rom Earth to the Moon is 3.8 x 10^8 m, that the Moon takes 27 days to orbit Earth, and that the mass of the Moon is 7.4 x 10^22 kg, what is the acceleration of the Moon and the size of the attractive force between Earth and Moon?

    asked by Lindsay on September 18, 2006
  67. physics

    I have no idea how to start this problem. I don't want the answer just how to start.A supertanker (mass = 1.70x10^8kg) is moving with a constant velocity. Its engines genterate a forward thrust of 7.40x10^5N. Determine (a) magnitude of the resistive force

    asked by Anji on October 14, 2013
  68. Physics

    Posted by Adam on Thursday, August 13, 2009 at 11:08am. In the figure take q1 = 22uC and q2 = 20u. The force on q_1 points in the - x direction, What is the magnitude of the force on q_1? I don't know where to start, can someone help me? Responses Physics

    asked by Adam R on August 14, 2009
  69. physics help

    I know that the answer to this problem is (0.2237232293) and to begin it by making a force body diagram, but I need help setting up the equation(s). Thanks! A box rest on an incline making a 30 angle with the horizontal. It is found that a parallel force

    asked by jessica on October 3, 2014
  70. Physics 12

    Oh goodness, another review question. "The 2.0kg head of an axe strikes a tree horizontally at 40 m/s. The blade penetrates 0.040 m into the tree. What is the average force exerted by the blade on this tree? Is this just net force? Why do they give you the

    asked by solexgirl12 on October 29, 2008
  71. Physics

    Starting from rest, a 5.00 kg block slides 2.50 m down a rough 30.0 degree incline. The coefficient of kinetic friction between block and the incline is .436. Determine the work done by the friction force between block and incline and the work done on the

    asked by Dee on October 12, 2011
  72. physics

    A net external force is applied to a 13 kg object that is initially at rest. The graph to the left shows net force component along the displacement of the object as it varies with displacement. 1) What is the work done between 0 m and 4 m? 2. What is the

    asked by Anonymous on October 5, 2013
  73. science

    if the force which propels the cannonball forward is 500 n, how much force will move the cannon backward? I assume -500n because forward is the opposite of backward, and 500n is the opposite of -500n. Forces occur in equal and opposite pairs.

    asked by britney on December 6, 2006
  74. Physics

    Starting from rest, a 5.00 kg block slides 2.50 m down a rough 30.0 degree incline. The coefficient of kinetic friction between block and the incline is .436. Determine the work done by the friction force between block and incline and the work done on the

    asked by Dee on October 13, 2011
  75. Physics please help

    Starting from rest, a 5.00 kg block slides 2.50 m down a rough 30.0 degree incline. The coefficient of kinetic friction between block and the incline is .436. Determine the work done by the friction force between block and incline and the work done on the

    asked by Dee on October 12, 2011
  76. physics

    A force of 55 N at an angle of 32 degrees to the horizontal is applied to drag a 15kg box across a horizontal floor at a velocity of 2.5 m/s. The coefficient of friction between the box and the floor is 0.25 and the box is moved 15m across the floor. How

    asked by Jan Dupre on January 27, 2016
  77. Physics

    A 30m bar with a mass of 20kg is being lifted by a string. The bar makes an angle of 55 degrees above horizontal (between the bar and ground). The string is attached to the ceiling vertically. What is the tension on the string? What is the normal force

    asked by Riley on July 16, 2017
  78. Physics/Math

    A single force acts on a 5.0 kg particle-like object in such a way that the position of the object as a function of time is given by x = 3.0t - 4.0t 2 + 1.0t 3, with x in meters and t in seconds. Find the work done on the object by the force from t = 0 to

    asked by Technoboi11 on March 3, 2007
  79. algebra

    the pressure (p) that a 160-pound person's shoe exerts on the ground when walking varies inversely with area (a) of the sole of the shoe. when the shoes have a sole area of 40 sq. in., the pressure is 4 pounds per sq. in. what is the sole area of the sole

    asked by bobby on March 3, 2012
  80. Physics

    An ant climbs onto the side of a bicycle tire a distance of 40.0 m from the hub. If the 0.010 g ant can hold onto the tire with a force of 4.34*10 to the -4, at what frequency would the tire fling the ant of assuming the wheel is spun on a horizontal

    asked by Neha on November 2, 2014
  81. Differential Calculus

    a person standing at the edge of a cliff throws a rock directly upward. it observed that 2 seconds later, the rock is it maximum height and that 5 seconds after it reached the highest point, it hits the ground at the base of the cliff. what is the initial

    asked by rex on April 28, 2015
  82. physics

    You and your friend are on the roof of a 20 m tall building investigating a free fall. Your friend releases a small rock from rest. You throw another rock simultaneously with your friend aiming it straight down. (a) What initial speed should you supply to

    asked by Jane on September 28, 2014
  83. calculus

    A brick becomes dislodged from the top of a state building (at a height of 1290 feet) and falls to the sidewalk below. (a) Write the position, velocity, and acceleration functions of the brick. s(t) = v(t) = a(t) = (b) How long does it take the brick to

    asked by Brandi on March 6, 2013
  84. physics

    a projectile with a muzzle velocity of 550 m/s is fired from the a gun on top of a cliff 460 m above the sea level at a certain angle with respect to the horizontal. if the projectile hits the ocean surface. 49.2 seconds after being fired, determine the

    asked by jennierson on May 4, 2013
  85. physics

    A lunch tray is being held in one hand, as the figure below illustrates. The mass of the tray itself is 0.182 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.08 kg plate of food and a 0.279 kg cup of coffee. Assume L1

    asked by Katie on March 16, 2012
  86. AP Physics - Static Equilibrium

    A man doing push-ups pauses in the position shown in the figure. His mass is 75-kg. Determine the normal force exerted by the floor on each hand and on each foot. img145.imageshack.us/img145/7130/picture1n.png (copy into url bar) a = 40 cm b = 95 cm c = 30

    asked by Phillip on November 27, 2009
  87. Physics

    An ideal spring hangs vertically from the ceiling. When 1.0 kg mass hangs from the spring it is extended 5.0 cm from its relaxed length. A downward external force is now applied to the mass to extend the spring an additional 10 cm. While the spring is

    asked by Nicole on February 26, 2017
  88. Math

    The labor force included 127 million people, and 5% were unemployed. How many people in the labor force were unemployed?

    asked by Anonymous on March 2, 2010
  89. Lang. Arts

    Rewrite using commas. The weight of the rider is one force and gravity is another. I wrote... The weight of the rider is one force, and gravity is another.

    asked by Cassie on February 19, 2013
  90. PHYSICS

    the gravitational force between two masses is 500 N. What is the gravitational force if the masses are doubled and distance between them is likewise doubled?

    asked by NotYourTyn on September 13, 2015
  91. science,

    A force of 4400 N is exerted on a piston that has an area of 0.020 m2. What force is exerted on a second piston that has an area of 0.040 m2?

    asked by cristopher on July 15, 2015
  92. General Physics

    a force is applied to a 1.9 kg mass and produces a 3.1 m/s^2 acceleration. what acceleration would be produced by the same force applied to a 14.3 kg mass? answer in m/s^2

    asked by Jane Mitchell on October 3, 2011
  93. criminal justice

    1. What was the Metropolitan Police Act? A. Established after the September 11 attacks to protect police officers in New York City B. Established in the early 1800s to form the first large-scale organized police force in London C. Established after the

    asked by Amy on April 7, 2014
  94. rotational mechanics

    a thin rod of length 2R and mass M is standing vertically on a perfectly smooth floor. the state of equilibrium in which the rod at rest is unstable and the rod falls. FInd the trajectories that the various points of rod describe and velocity with which

    asked by pramod on March 31, 2010
  95. physics mechanical energy

    A skateboarder with mass ms = 42 kg is standing at the top of a ramp which is hy = 3.7 m above the ground. The skateboarder then jumps on his skateboard and descends down the ramp. His speed at the bottom of the ramp is vf = 6.3 m/s. Write an expression

    asked by carlo on October 7, 2013
  96. Physical science

    Two rectangular blocks are stacked on a table. The upper block has a mass of m2 and the lower mass is m1 > m2. The coefficient of kinetic friction between the lower block and the table is ųk. The coefficient of static friction between the two blocks is

    asked by Jessica on March 8, 2015
  97. Physics

    I have a few physics questions that I don't understand. Two are thermal expansion problems and the other is an ideal gas law problem. 1. Two rods, one made of iron and the other of aluminum, have the same initial length at 64.00 deg. C? When the

    asked by Alyssa on February 8, 2016
  98. physics

    if a rocket engine delivers a constant thrust, does it deliver more power as the rocket speeds up force = mass*(acceleration) if the rocket accelerates, the force will increase wow,uh constant thrust means it is delivering constant power. the kenetic

    asked by nicole on October 30, 2006
  99. Physics

    Im doing a problem on The Russell traction apparatus and I solved the weight to be 76N. The second part of the problem asks what the angle is if the traction force is 19.4N horizontally. My initial thought was to use half of the weight as the y-comp and

    asked by Lou-Anne on November 11, 2007
  100. physics

    A sled whose total mass with cargo is 30.0 kg rests on ice. The coefficient of static friction is 0.20, and the coefficient of kinetic friction is 0.15. The sled is attached to a rope, horizontally, in which the tension force is slowly increased. How much

    asked by anon on November 6, 2012