Asked by  | 10th Jan, 2009, 04:35: PM

Expert Answer:

Time period of a pendulum is directly proportional to the square root of the length of pendulum. With time, water tickles out, thus lowering the resultant centre of gravity of bob. This results in increase of length and hence an increase in time period

The centr of gravity of the empty bob has to be at the centr.

So, somewhere the resultant centre of gravity will start rising to come back to the centre when whole of the water has been drained out. Therefore, the time period will decrease back to its original value.

Answered by  | 11th Jan, 2009, 12:42: AM

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