Applied Mechanics and Graphic Statics
The following factor affects the orbit of a satellite up to an altitude of 720 km from the earth's surface

Aerodynamic forces
Gravity of the sun and the moon
Uneven distribution of the gravitational field
None of these

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Applied Mechanics and Graphic Statics
The following is in unstable equilibrium

A solid cube resting on one edge
A satellite encircling the earth
A uniform solid cone resting on its base on a horizontal plane
A uniform solid cone resting on a generator on a smooth horizontal plane

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