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Question

A flywheel of moment of inertia 0.32kgm2 is rotated steadily at 120 rad/sec by an electric motor. The kinetic energy of the flywheel is
  1. 4608 J
  2. 1152 J
  3. 2304 J
  4. 6912 J


Solution

The correct option is C 2304 J
Kinetic energy, K.E.  =12Iω2=12(0.32)(120)2=2304J.

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