Question

An electric motor can accelerate a Ferris wheel of moment of inertia I = 21000 kg·m² from rest to 11.0 rev/min in 12.0 s. When the motor is turned off, friction causes the wheel to slow down from 11.0 to 9.0 rev/min in 10.0 s.

(b) Determine the power that would be needed to maintain this rotational speed.

Answer 1

Find a fictional torque and use that to find the power to maintain the rotational speed as shown below

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