If a pendulum takes 4sec to swing in each direction, find the length of the pendulum.
4.2 m
3.97 m
5.2 m
15.9 m
A
5.2 m
B
15.9 m
C
4.2 m
D
3.97 m
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Solution
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Given: The pendulum takes 4sec to swing in each direction, which means it swings in one side of the pendulum for 4 sec. So, half time period, T2=4sec
Time period of simple pendulum, T=2×4=8s
T=2π√lg ⇒8=2π√l10 ⇒l=64×104×π2
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