Practice question
Question
A torque of 15Nm acts on a wheel with moment of inertia 5kg m2 starting from rest. What is its angular speed after 3s?
Explanation
α = τI = 155 = 3rad/s2. ω = ω0+αt = 0+3×3 = 9rad/s. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 9 rad/s. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
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