Q.

A round object is rolling without sliding on a horizontal surface. If ratio of its translational energy to total energy is 2 : 3, then the object is a

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a

Thin spherical shell

b

Thin ring

c

Solid sphere

d

Solid disc

answer is D.

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Detailed Solution

12mV212mV2+12IC(VR)2=23⇒11+ICmR2=23⇒IC=12 mR2
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A round object is rolling without sliding on a horizontal surface. If ratio of its translational energy to total energy is 2 : 3, then the object is a