A 2000 kg elevator accelerates upward at 1.00 m/s2 for 12.0 m , starting from rest. How much work does the tension in the elevator cable do on the elevator?

A 1.3Kg particle moves from an initial position r1=2i-1j+2k m to a final position r2=6i-4j-4k m while a force F=4i-5j+4k N acts on it. What is the work done by the force on the particle? Answer in Joules

A nonconstant force is exerted on a particle as it moves in the positive direction along the x axis. The figure below shows a graph of this force F, versus the particle's position x. Find the work done by this force on the particle as the particle moves as follows. Fx (N) 12.0 X (m) 4.0 8.0 12.0 16.0 -12.0 (a) From x; = 0 to x = 8.0 m 44 Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. J (b) From X; = 8.0 to Xf = = 16.0 m |-60 Your response differs from the correct answer by more than 100%. J (c) From x; = 0 to x = 16.0m |-30 The response you submitted has the wrong sign. J

A factory worker moves a 23.0 kgkg crate a distance of 4.50 mm along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.300.   What magnitude of force must the worker apply?   How much work is done on the crate by the worker's push?   How much work is done on the crate by friction?   How much work is done by the normal force and by the gravity?   What is the net work done on the crate?

A 12.0 kg box is given an initial push that starts it sliding across the floor. It eventually comes to a stop. If the box has an initial velocity of 3.5 m/s, how much work is done by friction to cause it to come to a stop? (Yes, you are correct, you do not know the coefficient of friction.)

A7.1 kg body is at rest on a frictionless horizontal air track when a constant horizontal force F acting in the positive direction of an x axis along the track is applied to the body. A stroboscopic graph of the position of the body as it slides to the right is shown in the figure. The force F is applied to the body at t = 0, and the graph records the position of the body at 0.50 s intervals. How much work is done on the body by the applied force F between t = 0 and t = 1.2 s? 0.5 s 1.0 s 1.5 s 2.0 s 0.2 (0.4 0.6 0.8 х (m) Number Units

A 246.63 kg crate slides 3.08 m until coming to a stop after being pushed by a large man. The effective coefficient of kinetic friction between the crate and the surface is 0.13. Calculate the work done by friction.

Samantha pushes a 113 kgkg crate on a ramp that makes 8.59 degreesdegrees with the horizontal. What is the change in potential energy of this crate after Samantha pushes it for 10.0 mm along the ramp? (The answer choices have 3 significant figures.)

A dog (of mass 50 kg) is happily sliding down a hill that has a coefficient of kinetic friction of 0.2. The hill has a slope of 20 degrees. Assuming that the dog is letting gravity do all the work, what is the magnitude of the dog's acceleration down the slope? 0.51 O 3.51 O 2.51 1.51 600

A 7.00-kg package slides 2.50 m down a long ramp that is inclined at 24.0  below the horizontal. The coefficient of kinetic friction between the package and the ramp is μk = 0.370. Calculate the work done on the package by friction. Calculate the work done on the package by gravity. Calculate the work done on the package by the normal force. Calculate the total work done on the package. If the package has a speed of 2.40 m/s at the top of the ramp, what is its speed after it has slid 2.50 m down the ramp?