6. What power is used by a machine to perform 800 J of work in 25 s?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in

At the negative terminal of the battery the electron has electric potential energy. what happens to this energy as the electron jumps from the negative to the positive terminal?