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QNEET-2018-Ph-913: NEET 2018 Physics - Class 11 NEET-2018-Ph-913 Solution: Three objects A: (a solid sphere) B: (a thin circular disk) and …
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
Multiple Choice Options
- A W C > W B > W A
- B W A > W B > W C
- C W B > W A > W C
- D W A > W C > W B
Step-by-Step Verified Solution
Work done required to bring them rest
_ W = _ K E (work-energy theorem)
_ W = 1 2 I _ 2
For same _ , _ W � I
For a solid sphere, I A = 2 5 M R 2
For a thin circular disk, I B = 1 2 M R 2
For a circular ring, I C = MR 2
_ I C > I B > I A
So, W C > W B > W A