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Q.

A flywheel is a uniform disc of mass 72 kg and 50 cm. When it is rotating at the rate of 70 rpm its kinetic energy is

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a

142J

b

242J

c

342J

d

300J

answer is B.

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Detailed Solution

K.E.=12Iω2The moment of inertia of flywheelI=MR2/2∴ K.E.=12×MR22×(2πv)2=π2MR2v2=(3⋅14)2×72×(0⋅5)2×(70/60)2=242J
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