If the length of second's pendulum is decreased by 2%, how many seconds it will lose per day

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3927 sec

3727 sec

3427 sec

864 sec

answer is D.

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Detailed Solution

T∝l ⇒ΔTT=12Δll=0.022=0.01 ⇒ΔT=0.01 TLoss of time per day =0.01×24×60×60=864sec

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