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範例:重力位能與零位面

已知地球的質量為M,半徑為Re,若在距離地心r(r>Re)處的重力位能為零,則質量為m的物體,在距離地心2r處的重力位能為多少? (假設地球為一均勻之球體)


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Posted in 重力位能的一般式.

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