An object is weighed at the North Pole by a beam balance and a spring balance, giving readings of W B and W S respectively. It is again weighed in the same manner at the equator, giving readings of W B ' and W S ' respectively. Assume that the acceleration due to gravity is the same everywhere and that the balances are quite sensitive.
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(a, c)
Due to the rotation of the earth on its axis, the apparent weight of an object becomes slightly smaller at the equator than at the poles. This difference can be recorded on a spring balance, but not on a beam balance.
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