Question

To maintain a rotor at a uniform angular speed of 200 rad s^-1, an engine needs to transmit a torque of 180 Nm. 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.

Answer 1

Here,

τ = 18 Nm,

ω = 200 rad s^-1

As P = τω

P = 180 x 200 = 36000 watt