NEET 2019 Physics Torque and Angular Momentum MCQ Question
A solid cylinder of mass 2 kg and radius 4 cm is rotating about its axis at the rate of 3 rpm. The torque required to stop after 2π revolutions is
12 × 10⁻⁴ Nm
2 × 10⁻⁶ Nm
2 × 10⁶ Nm
2 × 10⁻³ Nm
Correct Answer
Detailed Explanation
The torque required can be calculated using the formula τ = Iα, where I is the moment of inertia and α is the angular deceleration. The moment of inertia for a cylinder is I = 0.5 * m * r². Using the given values, the torque is calculated to be 12 × 10⁻⁴ Nm.
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