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  4. An ant is sitting at the edge of a rotating disc. If the ant reaches the other end, after moving along the diameter, the angular velocity of the disc will:-

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Q. An ant is sitting at the edge of a rotating disc. If the ant reaches the other end, after moving along the diameter, the angular velocity of the disc will:-

System of Particles and Rotational Motion

Solution:

image
Initially as ant move towards axis $I$ decreases so $\omega$ increases
After crossing axis $I$ increases and $\omega$ decreases
so, first $\omega$ increases then $\omega$ decreases