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Question

On the application of a constant torque, a wheel is turned from rest through 400 radius in 10s. If same torque continues to act, what will be angular velocity of the wheel after 20s from start?

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Solution

The initial angular velocity ω0=0sec and angular velocity after 10 seconds sec ω=40010=40radsec

Therefore angular acceleration sec α=ωω0t=40010=4radsec2

Angular velocity after 20 seconds,ω=ω0+αt=0+420=80radsec

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