Question: Two Earth's satellites move in a common plane along circular orbits. The orbital radius of one satellite r = 7000 km while that of the

Two Earth's satellites move in a common plane along circular orbits. The orbital radius of one satellite r = 7000 km while that of the other satellite is Δr = 70 km less. What time interval separates the periodic approaches of the satellites to each other over the minimum distance?

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