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A satellite is going in a circular orbit...

A satellite is going in a circular orbit of radius `4 xx 10^4` km around the earth has a certain speed.
(a) What will be the radius of a circular orbit of the same satellite when it moves around the planet Mars with the same speed?
The masses of earth and Mars are in the ratio `10:1` and their radii are in the ratio `2:1`

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