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A pendulum beats seconds on the surface ...

A pendulum beats seconds on the surface of the Earth. Calculate as to how much it loses or gains per day if it is taken to,
(a) a mass 8 km below,
(b) a point 8 km above, the surface. (Radius of the Earth `= 6.4 xx 10^(6)m`)

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The correct Answer is:
(a) `54` sec; (b) `107.9` sec
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