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Q.

A seconds pendulum is taken to an altitude above the earth, which is equal to radius of the earth, there its new time period (in sec) would be _________.

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answer is 4.

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Detailed Solution

Time period of a pendulum varies with value of g as  T2g=constant, T12g1=T22g2

Then  22g=T22gR2R+R2

4g=T22g4⇒T22=16 or T2=4sec

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