The velocity of a satellite in circular orbit around the Earth depends upon the radius of the orbit and the acceleration of gravity at the orbit.

Above the earth's surface at a height of

h =m = x 10^{6} m,

which corresponds to a radius

r = x earth radius,

the acceleration of gravity is

g = m/s^{2} = x g on the earth's surface.

At the specified orbit radius, the required orbit velocity is

v =m/s=km/h=mi/h.

The period of the orbit is minutes = hours.

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