Physics-
General
Easy

Question

Two wheels P and Q are mounted on the same axle. The moment of inertia of P is 6 kg-m2 and it is rotating at 600 rotations per minute and Q is at rest. If the two are joined by means of a clutch then they combined rotate at 400 rotations per minute. The moment of inertia of Q will be -

  1. 3 kg-m2  
  2. 4 kg-m2  
  3. 5 kg-m2  
  4. 8 kg-m2   

The correct answer is: 3 kg-m2

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