本题目来源于试卷: new new new new，类别为 IB物理学
[问答题]
Will an object weigh more ox:8y7 cbf7 8hav;ml gat the equator or at the poles? Wh s t0angyc+ t kh(9da:sn.) )7mzhhoi/at two effects are at work? Do they opposi 0o9)an:sz( k atnc)hs mhhy/g.7td+e 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.
本题详细解析:
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