Applied Mechanics and Graphic Statics
The following is in unstable equilibrium

A satellite encircling the earth
A solid cube resting on one edge
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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Applied Mechanics and Graphic Statics
The necessary condition of equilibrium of a body is:

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

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