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A satellite moves on a circular earth orbit that has a radius of 6.7x10^6 m. A model airplane is flying on a 15 m guideline on a horizontal circle. The guideline is parallel to the ground. Find the speed of the plane such that the plane and the satellite have the same centripetal acceleration

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If M is the mass of earth and m the mass of satellite the gravitational force at the satellite altitude H is

`F = G*m*M/R^2` , assuming R is measured from the center of the Earth

By writing also `F =m*g(R)` we observe that the gravitational acceleration at altitude R is

`g(R) =...

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