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Question

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 20 kgm2s
and time taken =2 seconds.
Average torque =|ΔLΔt|
Average torque=|102|=|5|=5kgm2s2

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