What is the term for the flow of an electric charge that regularly reverses its direction?

Erosion of the beach is normally a slow process. however, in certain situations, large chunks of shore may wash out to sea. what could cause this to happen?

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

A2-kg bowling ball is 2.5 meters off the ground on a post when it falls. just before it reaches the ground, it is traveling 7 m/s. assuming that there is no air resistance, which statement is true?