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The greater the altitude of an Earth satellite, the longer it takes to complete one orbit. Why is it impossible for any vehivle to go aroung Earth in less than 80 minutes?
Surely the definition of an orbit is that centrifugal force equals the gravitational.Because the centrifugal force would be greater than gravitational, unless you compensate it some other way. Computing this you get the minimal period something about 84 minutes.