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Mars has a mass of about 6.410^23 kg, and it's moon Phobos has a mass of about 9.610^15 kg.If the magnitude of the grvitational force between the two bodies is 4.6* 10^15 N, how far apart are Mars and Phobos?

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It is simple algebra:

Fg= G M1*M2/distance^2

solve for distance

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