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Physics · PYQ NEET UG 2019(1)
हिन्दीA solid cylinder of mass \( 2\text{ kg} \) and radius \( 4\text{ cm} \) is rotating about its axis at the rate of \( 3\text{ rpm} \). The torque required to stop after \( 2\pi \) revolutions is
Correct answer · Option 3
\( 2 \times 10^{-6}\text{ Nm} \)
Explanation
Moment of inertia \( I = \frac{1}{2}mr^2 \). Using \( \omega^2 = \omega_0^2 + 2\alpha\theta \), find angular deceleration \( \alpha \), then torque \( \tau = I\alpha \).
