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A thin horizontal circular disc is rotat...

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 other end. During the journey of the insect, the angular speed of the disc

A

remains unchanged

B

continuously decreases

C

continuously increases

D

first increases and then decreases

Text Solution

Verified by Experts

The correct Answer is:
D
We use the principle of conservation of angular momentum. `Iomega=` constant. When the insect moves from the rim to the centre, the M.I. decreases and `omega` increases but when it moves from the centre to the rim, the M.I. increases and `omega` decreases.
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