A 90.0 kg man climbs hand over hand up a rope to a height of 9.47 m. How much potential energy does he have at the top?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit