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NEET UG PHYSICS MCQ: SYSTEM OF PARTICLES

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A thin horizontal circular disc is rotating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the disc. The insect now moves along a diameter of the disc to reach its other end. During the journey of the insect, the angular speed of the disc

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Correct option: C

first increases and then decreases

Option C (first increases and then decreases) is correct because as the insect moves towards the center, the moment of inertia of the system decreases, causing the angular speed to increase to conserve angular momentum. As the insect moves away from the center, the moment of inertia increases, causing the angular speed to decrease.

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