In 1953 two climbers, Hillary & Norgay, made the first successful ascent of Mt. Éverest. How many slices of bread did each climber have to eat to compensate for the increase in gravitational potential energy of the system of climbers. (One piece of bread releases about 1.0x106 J of energy. The body converts the chemical energy from the bread at 5% efficiency.) Use 62kg as an approximation for the mass of each climber.

A tennis player hits a 58.0 g tennis ball so that it goes straight up and reaches a max height of 8.09m. How much work does gravity do on the ball on the way up? (Express in joules) How much work does gravity do on the ball on the way down? (Express in joules)

I lower a block to the floor at constant speed. I do work on the block and gravity does work on the block.

A car accelerates from zero to a velocity v. Another car of indentical mass accelerates from zero to a velocity 2v. What is the ratio of the work done on the first and second car? A 1:1 B 1:2 © 1:4 D 1:8

19. An object moving along the x axis is acted upon by a force F that varies with position as shown. How much work is done by this force as the object moves from x-2 m to x-8 m? RN 20 10 10

A 65 kg track star can get to her maximum speed of 8.5 m/s in 2.8 seconds. Calculate her power while giving herself kinetic energy.

How can we ignore the self-potential energy when doing a work-energy problem or an energy-conservation problem?  (Answer in a sentence or two or three.)

Is it possible that the work done by a force is negative? Give an example.

Is it possible to work in pushing an object without transferring any energy to the object? Describe the situation with the work done in this case and what happens to the energy..

Your humble physics Professor elevates a ball hanging from a string away from it's lowest position and holds it there. It requires 105 J of Energy to do this. How much work is required to elevate the ball? Not enough information to answer this question 50J 105 J O 100 J