A hollow sphere is filled with water through a small ho
| A hollow sphere is filled with water through a small hole in it. It is hung by a long thread and made to oscillate. As the water slowly flows out of the hole at the bottom, the period of oscillation will
A. increase
B. decrease
C. remain the same
D. first increase and then decrease
Please scroll down to see the correct answer and solution guide.
Right Answer is: D
SOLUTION
T=2π√lg
As the water flows out, the centre of mass of the bob with water shifts downwards and hence increases. Once all the water is completely drained out, the centre of mass shifts back to its initial position and then decreases.