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Question

Find out the effective length of a simple pendulum suspended at a place of g=9.8 m s−2, with a time period of 1 min.

A
56 km
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B
56 m
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C
5.6 km
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D
560 m
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Solution

The correct option is C 5.6 km
Given:
The time period of the pendulum, T=1 min=60 s
Acceleration due to gravity, g=9.8 m s2
Let the effective length of the pendulum be l.
Time period of a pendulum, T=2πlg
l=gT22π=9.8×60×602π
=352802π=5614.97 m5.6 km

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