At a construction site, a crane lifts a steel beam with a mass of 330 kg. While it is being lifted, the steel beam is at a height of 20 m and is moving with a speed of 1.3 m/s. What is the total mechanical energy of the steel beam at this moment?

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