A crane lifts four pallets of bricks, each of which weigh 5000 N. The crane lifts each pallet a height of 30m. The crane takes 4 minutes to do this.
How much useful power did the crane produce to lift the bricks?

A.150 000 W

B.625 W

C.2500 W

D.37 500 W

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

because if the tool that you are using is not balanced it there would be false mass.

there are no components of a physical goal mentioned on the list of choices that you've provided.