A flywheel rotating about a fixed axis has a kinetic energy of 360 J when its angular speed is 30 rad s-1. The moment of inertia of the wheel about the axis of rotation is

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0.6 kg m-2

0.15 kg m-2

0.8 kg m-2

0.75 kg m-2

answer is C.

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Detailed Solution

Rotational kinetic energy =12Iω2360=12I×30×30I=360×230×30kgm2=0.8kgm−2

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