Practice question
Question
A thin ring of mass 5kg and radius 0.4m has an angular momentum of 8kg m2/s. What is its angular velocity?
Explanation
I = MR2 = 5×(0.4)2 = 0.8kg m2. ω = LI = 80.8 = 10rad/s. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 10 rad/s. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.
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