A water skier is pulled by a tow rope behind a boat. He skies off to the side, and the rope makes an angle of 20° with his direction of motion. The tension in the rope is 120 N. How much work is done on the skier by the rope during a displacement of 250 m?

A raft is being dragged along a channel by two chains dragged to the right. The tension in each chain is T =10 kN and each chain is being pulled at an angle of θ = 200 relative to the direction of motion. How much work will be done in pulling this raft a distance of 4.0 km?

Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a ? = 62.0° slope at constant speed, as shown in the figure. How much work is done (in J) by friction as the sled moves 30.0 m along the hill? How much work is done (in J) by the rope on the sled in this distance? What is the work done (in J) by gravity on the sled? What is the total work done (in J)?

A spring and block are in the arrangement of the figure. When the block is pulled out to x = +4.0 cm, we must apply a force of magnitude 360 N to hold it there. We pull the block to x = 12.0 cm and then release it. How much work does the spring do on the block when the block moves from x₁ = +5.0 cm to (a) x = +3.0 cm, (b) x = -3.0 cm, (c) x= -5.0 cm, and (d) x = -9.0 cm? x=0 Ę = 0 oooooooo (a) x positive F negative F o o o o o o u (b) (c) -Block attached to spring x negative F, positive x X

A motorcyclist runs out of gas on a level road 250 m from the gas station. She pushes the 220-kg motorcycle with a constant force of 150 N. How much work does she do?

A 4.5kg sled is pulled across level snow with a force of 225N on a rope that is 35 degrees above the horizontal. If the sled moves 65.3m in 2.5 minutes, how much work does the person do on the sled? How much power is exerted on the sled? The person is pulling as hard as possible on the rope. How else can the amount of work be increased?

A helicopter lifts a 85 kg astronaut 13 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. How much work is done on the astronaut by (a) the force from the helicopter and (b) the gravitational force on her? Just before she reaches the helicopter, what are her (c) kinetic energy and (d) speed?

A child on a sled is initially at rest on an icy horizontal surface. The sled is pushed until it reaches a final velocity of 6.05 m/s in a distance of 15.6 m. The coefficient of friction between the ice and runners of the sled is 0.200, and the weight of the child and the sled is 375 N. Find the work done by the force pushing the sled.

The graph (attached) shows the x component of a force that acts on an object that moves on the x axis. The vertical spacing between adjacent grid lines is 2.75 N, while the horizontal spacing between adjacent grid lines is 1.0 m.  What is the work done by the force, in joules, as the object moves from x=1m to x=8m?

A father pulls his young daughter on a sled with a constant velocity on a level surface through a distance of 10 meters. If the total mass of the sled and girl is 35 kg and the coefficient of friction between the sled runners and the snow is 0.2, how much work does the father do?