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A horizontal platform is rotating with u...

A horizontal platform is rotating with uniform angular velcity around the vertical axis passing through its centre. At some instant of time a viscous fluid of mass `m` is dropped at the centre and is allowed to spread out and finally fall. The angular velocity during this period :

A

decreases continuously

B

increases continuously

C

does not change

D

decreases initially and increases again at the end

Text Solution

Verified by Experts

The correct Answer is:
D
Initially the viscous liquid will flow slowly from the centre upto the edge of the disc. Hence I will increase and `omega` will decrease. But when the liquid falls down, the M.I. is decreased and `omega` is again increased.
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