Question

Any help is appreciated!

A grandfather clock is based on the period of oscillation of a pendulum. The clock keeps
perfect time on the first floor of the Sears tower but when carefully moved to the top
floor h=436 m above the surface of the earth, the clock is found to be slow.
(a) What is the reason for this?
(b) How many seconds does the clock loose in one day on the top floor?
(The radius of the earth is R=6.37.
106 m)

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