Rotational MotionHard
Question
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:
Options
A.continuously decreases
B.continuously increases
C.first increases and then decreases
D.remains unchanged
Solution
Angular momentum is conserve
I1ϖ1 = I2ϖ2 ⇒ ϖ2=
I2 first decreases and then increases
∴ ϖ E first increases and then decreases.
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