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Question

The length of a second's pendulum on the surface of the earth is equal to 99.49 cm. True or false.
  1. True
  2. False

A
False
B
True
Solution
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The time period of seconds pendulum T = 2 seconds, acceleration due to gravity at earth g= 980 cms2,It 'l' is the length of pendulum,
l=T2g4π2l=4×9804×(227)2=4×980×494×489=99.49

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