PLS HELP I HAVE EXAM ILL GIVE U BRAINLIST Negatively charged free electrons move in one direction, and positively charged holes move in the same direction.

True or False​

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.

The energy equivalent of the rest mass of an electron is