A 4812 kg boulder sits on top of a 203 m cliff. What is its PE?

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

How to know which equation of motion to use where?explain

What is offspring? why does a longer life span mean a higher chance of producing offspring?