Question

A grinding wheel of mass 5.0 kg and diameter 0.4m is rotating with an angular speed of 2

rev s-1. Calculate the torque which will increase its angular speed to 8 revolution per

second in 2s.

Answer 1

torque=moment of inertia* alpha

alpha= 8-2/2=3rev/s

moment of inertia(if considered ring)=mr^2=5*0.2^2=0.2 units

torque=0.2*3=0.6 Nm

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