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Torque and angular acceleration of a fly wheel
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1)Rotational analogue of force is called 
  

2)When torque of a rotating body is zero, which among the quantity is conserved? 
  

3)Let M,R be the mass and radius of flywheel, what happens to its moment of inertia I when the mass is doubled and radius is reduced to half 
  

4)A flywheel starts from rest and gains an angular velocity ω=5t²rads⁻¹.Find its angular acceleration α 
  

5)A wheel has an angular velocity, ω=36rads⁻¹ and comes to rest with an angular acceleration, α 4t²rads⁻².It stops in time t of 
  


  


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