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Questions  

The length of a second's pendulum is about

a
99.4 m
b
9.94 m
c
99.4 cm
d
9.94 cm

detailed solution

Correct option is C

For second's pendulum ​T=2 s, g=9.8 m/s2​⇒T=2πlg⇒l=gT24π2=0.99 m

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