A satellite is in a circular orbit about the Earth at a distance of one Earth

A satellite is in a circular orbit about the earth at

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10. A satellite is in a circular orbit about the Earth at a distance of one Earth radius above the surface. What is the speed of the satellite? (The radius of the Earth is 6.4 106m, and G= 6.67 1011Nm2/kg2.) ____ 11. If the mass of Mars is 0.107 times that of Earth, and its radius is 0.530 that of Earth, estimate the gravitational acceleration gat the surface of Mars. (gearth= 9.80 m/s2)