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GMm/r^2=mr(2π/t)^2=(mv^2)/r=(mv2π)/T =mrw^2密度=3g/4πRG(R為該星球的半徑)mg=GMm/r^2應用變式求天體質量(以地球質量計算為例①知月球繞地球運動的週期T,半徑r由GMm/r^2=mr(2π/t)^2得,M=4(π^ 2)(r^3)/…
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