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Question

A constant torque of 31.4 Nm is exerted on a pivoted wheel. If angular acceleration of wheel is 4π rad s2, then the moment of inertia of wheel is 
  1. 3.5 kgm2
  2. 2.5 kgm2
  3. 4.5 kgm2
  4. 5.5 kgm2


Solution

The correct option is B 2.5 kgm2
τ=31.4Nm,α=4π rad s2τ=IαI=31.44π=2.5 kgm2

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