To maintain a rotor at a uniform angular speed of `200 rad s^-l`, an engine needs to transmit a torque of 180 N m. What is the power required by the engine ? (Note: uniform angular velocity in the absence of friction implies zero torque. In practice, applied torque is needed to counter frictional torque). Assume that the engine is 100% efficient.

Explanation

We are given: `tau= 180 Nm, omega = 200 rad s^(-1)`
We are to calculate, power, P
We know that, `P = tauomega`
Therefore `P = 180 xx 200 = 36000` watt.