Questions
Three objects, A: (a solid sphere), B: (a thin circular disk) and C: (a circular ring), each have the same mass M and radius R. They all spin with the same angular speed about their own symmetry axes. The amounts of work (W) required to bring them to rest, would satisfy the relation
detailed solution
Correct option is A
Work done required to bring a object to restΔW=ΔKEΔW=12Iω2; where I= moment of inertia For same ω,ΔW∝I For a solid sphere, IA=25MR2 For a thin circular disk, IB=12MR2 For a circular ring, IC=MR2∴ IC>IB>IA∴WC>WB>WASimilar Questions
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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