First slide

Simple hormonic motion

Question

A second's pendulum is working in a lift. If the lift begins to fall freely towards the earth, what will be the time period of the pendulum in this case?

Moderate

A

2 sec
B

1 sec
C

Zero
D

$\infty$

Solution

For a simple pendulum , T = 2 $π {\sqrt{\frac{l}{g}}}_{e}$ . When the lift is freely falling , $g_{e} = g - g = 0$ . Therefore T = $\infty$

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