In this electric motor, an electric current causes the coil to rotate, changing
a) magnetic energy to electrical energy.
b) electrical energy to a magnetic force.
c) potential energy to electrical energy.
d) electrical energy to mechanical energy.

right answer only !

Imagine you had to physically add electrons, one at a time, to a previously neutral conductor. you add one electron very easily, but the second electron requires more work. in your initial post to the discussion, explain why this is. also, what happens to the work needed to add the third, fourth, fifth, and subsequent electrons

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?