A spring has a natural length of 18.0 cm. If a 21.0-N force is required to keep it stretched to a length of 36.0 cm, how much work W is required to stretch it from 18.0 cm to 27.0 cm

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

Atruck with 34-in.-diameter wheels is traveling at 55 mi/h. find the angular speed of the wheels in rad/min, *hint convert miles to inches & hours to minutes:

Energy transformations that involve one transformation from one type of energy to another are called transformations.