Q98 / 180 · NEET 2018 · Physics

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 ω about their own symmetric axes. The amounts of work (W) required to bring them to rest, would satisfy the relation

  • A
    WB>WA>WC
  • B
    WA>WB>WC
  • Correct answer
    C
    WC>WB>WA
  • D
    WA>WC>WB

Solution

By work-energy theorem

W=loss in KE=12Iω2

IA=25MR2=0.4MR2

IB=12 MR2=0.5 MR2

IC=MR2

∴  WC>WB>WA

Hence, the correct answer is option: 'C'.

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