A boy pushes on a parked car with a force of 200 N. The car does not move. How much work does the biy do on the car?

What are the units of work ?

A weightlifer presses a 400 N weight 0.5 m over his head in 2 seconds. What is the power of the weightlifter?

A machine is a device that

What is the mechanical advantage of a single fixed pulley ?

An incline plane

Which of the following is a compound machine ?

What is the gravitational potential energy of a 50 kg box that is 8.0 m above the ground ?

What are the units for power?

Gravitational potential energy depends on the

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