Practice question
Question
A torque of 20Nm is applied to a wheel with moment of inertia 4kg m2. What is its angular acceleration?
Explanation
τ = Iα. τ = 20Nm, I = 4kg m2. α = τI = 204 = 5rad/s2. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 5 rad/s². This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
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