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Question

A ring of radius 0.5 m and mass 10 kg is rotating about its diameter with an angular velocity of 20 rad/s. Its kinetic energy is
  1. 250 J
  2. 500 J
  3. 10 J
  4. 100 J


Solution

The correct option is A 250 J
Rotational kinetic energy 12Iω2=12(12MR2)ω2=12(12×10×(0.5)2)(20)2=250J

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