A 5-meter lever has a 4-meter long input arm. If an output force of 500 newtons is attached at one end of the lever, how much input force must be applied to move the 500-newton output force?

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