Practice question
Question
A uniform disk of mass 4kg and radius 0.5m rotates at 8rad/s. What is its angular momentum about its axis?
Explanation
L = Iω. For a disk: I = 12MR2 = 12×4×(0.5)2 = 0.5kg m2. L = 0.5×8 = 4kg m2/s. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 4 kg m²/s. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.
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