Practice question
Question
A solid sphere of mass 1kg and radius 0.2m rotates about its center at 10rad/s. What is its rotational kinetic energy?
Explanation
I = 25MR2 = 25×1×(0.2)2 = 0.016kg m2. K = 12Iω2 = 12×0.016×(10)2 = 0.008×100 = 0.8J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 0.8 J. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
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