Questions
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
detailed solution
Correct option is B
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=242JTalk to our academic expert!
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A flywheel is in the form of a uniform circular disc of radius 1 m and mass 2 kg. The work which must be done on it to increase its frequency of rotation from 5 rps to 10 rps is approximately
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