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## Homework Statement

Two satellites of the Earth move in a common plane along circular orbits , the radii being r and r-[tex]\Delta[/tex]r ( [tex]\Delta[/tex]r << r ). What is the time interval b/w their periodic approaches to each other over the min. distance . Take M to be the mass of the Earth

M = 6 * 10

^{24}kg , r = 7000 km , [tex]\Delta[/tex]r = 70 km ).

## Homework Equations

## The Attempt at a Solution

i m unable to understand the quesn...