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Two satellites of the Earth move in a co...

Two satellites of the Earth move in a common plane along circular orbits, the radii being `r` and `r-Deltar(Deltar lt lt r)`. What is the time interval between their periodic approches to each other over the minimum distance Take to `M_(c )` to be the mass of the Earth.
`(M_(c )=6xx10^(24)kg`, `r=7000km`, `Deltar=70km`).

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