如图所示一个质量均匀分布的半径为r的球体对球外质点p的万有引力为f.如果在球体中央挖去半径为r的一部分球体且r=$frac{r}{2 Template




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tomski如图所示一个质量均匀分布的半径为r的球体对球外质点p的万有引力为f.如果在球体中央挖去半径为r的一部分球体且r=$frac{r}{2 coloring