A flywheel of the moment of inertia 0.4 k g m 2 and radius 0 . 2 m is free to rotate about a central axis. If a string is wrapped around it and it is pulled with a force of 10 N , then its angular velocity after 4 s will be

Question

A flywheel of the moment of inertia 0.4 k g m 2 and radius 0 . 2 m is free to rotate about a central axis. If a string is wrapped around it and it is pulled with a force of 10 N , then its angular velocity after 4 s will be, 10 r a d s - 1, 5 r a d s - 1, 20 r a d s - 1, None of these

MARKS App · Accepted Answer

F × r = I α = I ( ω 2 - ω 1 ) t ∴ ω 2 - ω 1 = F × r × t I = 10 × 0.2 × 4 0.4 = 20 r a d s - 1

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