a ceiling fan of moment of inertia 30 kgm2 rotate about its own axis at a speed of 12rpm2 under the action of an electric motor of power 62.8 walt. if electric power is cut off, how many rotation will it complete before coming to rest..?
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Explanation:
ANSWER
τ=Iα
α= dt/dω
= 5.5/3.5×2π
=4
∴τ=Iα=1.25×4=5 Nm
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