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A hollow sphere filled with water and on...

A hollow sphere filled with water and one small hole at bottom is hung by a long thread and made to oscillates. The effect on the period of oscillation as water slowly flows out of the hole at bottom………

A

decreases continuously

B

increases continuoulsy

C

first decrease and then becomes equal to its original value

D

first increases and then becomes equal to its original value

Text Solution

Verified by Experts

The correct Answer is:
D
When the hollow sphere filled with water, its centre of gravity is at mid-point and hence as the water flow out from a hole, its length increases, so according to `T propto sqrt(l)`, period of oscillation increases. But it completely emply, its centre of gravity coming at midpoint and its period of oscillation becomes as to original period of oscillation.
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