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The angular momentum of a flywheel having a rotational inertia of 0.161 kg·m2 about its central...

The angular momentum of a flywheel having a rotational inertia of 0.161 kg·m2 about its central axis decreases from 8.60 to 0.820 kg·m2/s in 4.00 s. (a) What is the magnitude of the average torque acting on the flywheel about its central axis during this period? (b) Assuming a constant angular acceleration, through what angle does the flywheel turn? (c) How much work is done on the wheel? (d) What is the magnitude of the average power done on the flywheel?

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Answer #1

Here we use the fact that torque is equal to rate of change of angular momentum. Find the initial and final angular speed using the value of moment of inertia and angular momentum and use rotational kinematics to find the angle turned by the flywheel.

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