PLEASE HELP! I'm so confused A worker applies an input force of 74 N [up] to open a window with a crowbar that provides an output force of 611 N [up]. What is the crowbar’s mechanical advantage?

It takes 120 J of work to lift an elevator 20 m. If this is done in 28 s, what is the average power of the elevator during the process?

Suppose you are moving a box of books. Calculate your power output if you exert a force of 55.0 N to push the box 14.0 m in 13.0s.

How long does it take for a 466 watt machine to do 2740 J of work?

While rowing in a race, John uses his arms to exert a force of 177 N [down] while pulling the oar 0.75 m. How much work does he do?

If 5.0 J of work is done in raising a 1.76 N apple, how far was it lifted?

If you do 2500 J of work on a box that you moved 5.0 m to the right, what force did you use to move the box?

A 8.0 meter long ramp is use to lift a piano into a moving truck which is 2.5 meters off the ground. What is the mechanical advantage of the ramp?

A 6.0 kg box is lifted upward at a constant speed to a height of 7.5 m. What work is done on the box?