Question

A simple pendulum is made of a bob which is a hollow sphere containing mercury suspended by a means of a wire if mercury is strength of continuously the period of the pendulum will

Answer 1

Answer:

When a little mercury is drained off, the position of c.g. of ball falls (w.r.t. fixed and) so that effective length of pendulum increases hence T increase

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Explanation:

Answer 2

Answer:

First increases then decreases

Explanation:

When mercury starts draining, the Centre of gravity of the Bob starts to move down thus increasing the effective length of the pendulum. Hence time period increases. But after all mercury is drained off, the centre of gravity shifts back to its original position thus decreasing the effective length and hence the time period.