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A person stands on a spring balance at t...

A person stands on a spring balance at the equator.
(a) How much is the reduction in weight as measured by the balance.
(b) If the speed of earth's rotation is changed such that the balance reading is half of its true weight, what will be the length of the day in this case? `(g=10m//s^(2),R_(e)=6400km)`

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