A disk starts from rest and rotates about a fixed axis, subject to a constant net torque.The work done by the torque during the second revolution is ______ as the work done during the first revolution.
A)the same
B)twice as much
C)half as much
D)four times as much
E)one fourth as much

Question

Quizplus · Accepted Answer

The work done by torque is given by the equation W = τΔθ, where τ is the torque applied and Δθ is the change in angle. Since the disk starts from rest, it completes one revolution in 2π radians. During the second revolution, the angle changes by another 2π radians. However, the torque applied is constant and does not change. Therefore, the work done during the second revolution is the same as that during the first revolution, as the angle and torque are the same in both cases.

A Disk Starts from Rest and Rotates About a Fixed