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Q.

A pendulum clock (Time period = 1 sec) is taken 1 km inside the earth from mean sea level.  Then the pendulum clock

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a

 gains 13.5 s per day

b

loses 13.5s per day

c

gains 7s per day

d

 loses 7s per day

answer is C.

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Detailed Solution

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Tα1g; g1=g(1dR)

T=TI-T=1×64006400-1-1 sec

in 24 hrs,

T'=TT×24×60×60=6.75 sec 

it loses 6.75 sec in 1 day.

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