First slide

Applications of SHM

Question

A simple pendulum is attached to the roof of a lift. If time period of oscillation, when the lift is stationary is T. Then frequency of oscillation, when the lift falls freely, will be

Easy

A

Zero
B

T
C

1/T
D

None of these

Solution

When lift falls freely effective acceleration and frequency of oscillations be zero
$g_{eff} = g - g = 0$ $\Rightarrow T^{'} = 2 π \sqrt{\frac{l}{g - g}} = \infty$ , hence a frequency = 0.

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