1.mg=GmM/r^2,g=GM/r^2,g与r的平方成反比.
F=mg=65*9.8N=637N
F1=mg1=65*(9.8/4)N=159.25N(设物体到“地心”的距离为2R)
F2=mg2=65*(9.8/16)=39.8125N(设物体到“地心”的距离为4R)
2.物体和地球之间的“万有引力”与物体到地心的“距离平方”成反比.
physic物理问题英文6A.calculate the force of gravity on a 65-kg per
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