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可能有點淩亂, 把行星看做勻速圓周運動,萬有引力充當向心力,萬有引力又等於重力此時就有 F=GmM/(R^2)F=mg 所以,一個質量為M的天體在空間某點所產生的引力加速度可以用以下公式計算 即GM=g(R^2) (M表示天體的質量,r表示物體的質心到天體的距離.G是萬有引力常數.)
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