The angular momentum of a flywheel having a moment of inertia of 0.4kgm2 decreases from 30 to 20 kg m2/s in a period of 2 second. Find the average torque in Nm acting on the flywheel during this period.
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Solution
Given , Angular momentum changes from 30 to 20kgm2s and time taken =2 seconds. Average torque =|ΔLΔt| ⇒ Average torque=|−102|=|−5|=5kgm2s2