First slide

Applications of SHM

Question

A simple pendulum is made of a body which is a hollow sphere containing mercury suspended by means of a wire. If a little mercury is drained off, the period of pendulum will

Easy

A

Remains unchanged
B

Increase
C

Decrease
D

Become erratic

Solution

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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