本题目来源于试卷: gc physics textbook chapter 5 problems，类别为 通用国际物理
[问答题]
Will an object weigh mor-ml*mdhwa +5 le at the equator or at the poles? What tc2g7oli+ na 9 m(;sjrtc,vtm 1wo effects are at work1c;9mmo (v7s,iagj+t2tr ncl ? Do they oppose each other?
参考答案: An object weighs
more at the poles, due to two effects which complement (not oppose) each
other. First of all, the Earth is
slightly flattened at the poles and expanded at the equator, relative to a
perfect sphere. Thus the mass at the
poles is slightly closer to the center, and so experiences a slightly larger
gravitational force. Secondly, objects
at the equator have a centripetal acceleration due to the rotation of the Earth
that objects at the poles do not have.
To provide that centripetal acceleration, the apparent weight (the
radially outward normal force of the Earth on an object) is slightly less than
the gravitational pull inward. So the
two effects both make the weight of an object at the equator less than that at
the poles.
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