When materials need to move into a cell but require no energy to enter

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

Acar travels along a highway with a velocity of 24 m/s, west. the car exits the highway; and 4.0 s later, its instantaneous velocity is 16 m/s, 45° north of west. what is the magnitude of the average acceleration of the car during the four-second interval?

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.