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Rotational Work and Energy

A flywheel of...

Question

A flywheel of moment of inertia $0.32 k g - m^{2}$ is rotated steadily at 120 rad/sec by an electric motor. The kinetic energy of the flywheel is

A

4608 J

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B

1152 J

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C

2304 J

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D

6912 J

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Solution

The correct option is C 2304 J
Kinetic energy, K.E. $= \frac{1}{2} I ω^{2} = \frac{1}{2} (0.32) (120)^{2} = 2304 J .$

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