Applied Mechanics and Graphic Statics
The gravitational force makes a satellite go round the earth in a circular orbit, if it is projected with an initial velocity of

All listed here
8.04 km/sec at a height of 285 km
11.26 km/sec, the satellite escapes the pull of the earth
11.11 km/sec at a height of 37,400 km

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Applied Mechanics and Graphic Statics
The necessary condition of equilibrium of a body is:

Algebraic sum of the moments of the forces about a point must be zero
All (A), (B) and (C)
Algebraic sum of horizontal components of all the forces must be zero
Algebraic sum of vertical components of all the forces must be zero

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