Applied Mechanics and Graphic Statics
For a non-concurrent force system to be in equilibrium

Only the closure of funicular polygon is sufficient
Only the closure of force polygon is sufficient
None of these
Both force polygon and funicular polygon must close

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Applied Mechanics and Graphic Statics
The following is in unstable equilibrium

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
A satellite encircling the earth

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