A worker pushed a 22.0 kg block 12.0 m along a level floor at constant speed with a force directed 22.0° below the horizontal. If the coefficient of kinetic friction between block and floor was 0.180, what were (a) the work done by the worker's force and (b) the increase in thermal energy of the block-floor system? (a) Number i Units (b) Number i Units

A 1100 kg car drives up a hill that is 16.2m high. During the drive, two nonconservative forces do work on the car: (i) the force of friction, and (ii) the force generated by the car's engine. The work done by friction is −2.91×105J; the work done by the engine is 6.74×105JFind the change in the car's kinetic energy from the bottom of the hill to the top of the hill

A crane slowly lifts a 263 - kg crate a vertical distance of H = 13.0 m. mg crane F crane (a) How much work does the crane do on the crate? Enter to 3 significant figures W H 0 33,500 (b) How much work does the gravity do on the crate? Enter to 3 significant figures X√J XVI W gravity (c) What is the total work done on the crate? Enter to 3 significant figures ✓J W total = -33,500

Starting from rest, a 5.50-kg block slides 2.30 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is k (a) Determine the work done by the force of gravity. J (b) Determine the work done by the friction force between block and incline. J (c) Determine the work done by the normal force. (d) Qualitatively, how would the answers change if a shorter ramp at a steeper angle were used to span the same vertical height? 0.436.

A 1680 kg car skids on a level road with coefficient of kinetic friction 0.64 between the tires of the car and the road.  The car skids a distance of 102 m and comes to a complete stop.  The work done on the car by the force of kinetic friction is (enter your answer with two significant figures) possibly useful: W = (Fcosθ)d w = mg g = 9.81 m/s2

A collie drags its bed box across a floor by applying a horizontal force of 8.0 N.The kinetic frictional force acting on the box has magnitude 5.0 N. As the box is dragged through 0.70 m along the way, what are (a) the work done by the collie’s applied force and (b) the increase in thermal energy of the bed and floor?

1) A constant horizontal force of F = 200.0 N pushes a crate of mass m = 25.0 kg, initially at rest, along a rough horizontal surface. The crate travels a total distance of 8.00 m, and the coefficient of kinetic friction between the crate and the surface is 0.250. a) What is the work done on the crate by the force F? b) How much does friction increase the internal energy of the crate-surface system ?

A block of mass m = 2.80 kg is pushed a distance d = 5.40 m along a frictionless, horizontal table by a constant applied force of magnitude F = 16.0 N directed at an angle θ = 27.0° below the horizontal as shown in the figure below.   (a) Determine the work done on the block by the applied force. J(b) Determine the work done on the block by the normal force exerted by the table. J(c) Determine the work done on the block by the gravitational force. J(d) Determine the work done by the net force on the block. J

A machine pulls a 40 kg trunk 2.0 m up a 40 ramp at constant velocity, with the machine’s force on the trunk directed parallel to the ramp. The coefficient of kinetic friction between the trunk and the ramp is 0.40. What are (a) the work done on the trunk by the machine’s force and (b) the increase in thermal energy of the trunk and the ramp?

Starting from rest, a 5.40-kg block slides 3.40 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is µ, = 0.436. (a) Determine the work done by the force of gravity. (b) Determine the work done by the friction force between block and incline. (c) Determine the work done by the normal force. (d) Qualitatively, how would the answers change if a shorter ramp at a steeper angle were used to span the same vertical height?