Answer to Question #301685 in Physics for cali

Question

A 200 g object is whirled in a horizontal circle with a cord of radius 1.2 m at 3rev/s. The work done in doing this is.

Answer 1

Since the speed is constant, the force is perpendicular to the velocity, and, thus, to the displacement at any given moment of time. Thus, the work done in this process is zero.