Physics-
General
Easy

Question

A solid cylinder of mass M and R is mounted on a frictionless horizontal axle so that it can freely rotate about this axis. A string of negligible mass is wrapped round the cylinder and a body of mass m is hung from the string as shown in figure the mass is released from rest then A wheel having moment of inertia 2 text end text k g M to the power of 2 end exponent about its vertical axis, rotates at the rate of 60rpm about this axis. The torque which can stop the wheels rotation in one minute will be..

  1. fraction numerator pi over denominator 15 end fraction N m    
  2. fraction numerator pi over denominator 18 end fraction N m    
  3. fraction numerator 2 pi over denominator 15 end fraction text end text N minus m    
  4. fraction numerator pi over denominator 12 end fraction N m    

The correct answer is: fraction numerator pi over denominator 15 end fraction N m

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