Practice question
Question
A solid sphere of mass 3kg and radius 0.4m rotates about its center at 5rad/s. What is its rotational kinetic energy?
Explanation
I = 25MR2 = 25×3×(0.4)2 = 0.192kg m2. K = 12Iω2 = 12×0.192×(5)2 = 0.096×25 = 2.4J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 2.4 J. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
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