STANDARD Physics Angular Momentum MCQ Question
A solid cylinder of mass 20 kg and radius 20 cm rotates about its axis with an angular speed of 100 rad s⁻². The angular momentum of the cylinder about its axis is
40 J s
400 J s
20 J s
200 J s
Correct Answer
Detailed Explanation
The moment of inertia of the solid cylinder about its axis is I = (MR²)/2 = (20 kg)(0.2 m)²/2 = 0.4 kg m². Angular momentum L = Iω = (0.4 kg m²)(100 rad s⁻¹) = 40 J s.
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