What theory explains why the earth is a magnet

How much work does the charge escalator do to move 2.30 μc of charge from the negative terminal to the positive terminal of a 3.00 v battery?

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?