Question

Calculate the power required by a force to turn a rigid body by some angle theta

Answer 1

Thus the power to turn a rigid body is given as P = τω

Explanation:

Power in rotational motion is as in linear motion. derivation of Power to rotational motion can be obtained  from Work and Kinetic Energy, the instantaneous power (or just power) is defined as the rate of doing work

P = dW / dt

If we have a net torque then W =  τθ  and the power is

P = dW / dt = d / dt (τθ) = τ dθ / dt

P = τω

Thus the power to turn a rigid body is given as P = τω