Question

To maintain a rotor at a uniform angular speed of 200 rad s-1, 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

Answer 1

Answer:

Explanation:

Given,

The angular speed of the rotor, ω = 200 rad/s

Torque, T = 180 Nm

Therefore, power of the rotor (P) :

P = T ω

= 200 × 180

= 36.0 kW

Therefore, the engine requires 36.0 kW of power.

Answer 2

Answer:

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