Practice question
Question
A torque of 14Nm acts on a wheel with moment of inertia 7kg m2 starting from rest. What is its angular speed after 5s?
Explanation
α = τI = 147 = 2rad/s2. ω = ω0+αt = 0+2×5 = 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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