Engineering Mechanics
If a body is acted upon by a number of coplanar non-concurrent forces, it may

Rotate about itself without moving
Move in any one direction rotating about itself
Be completely at rest
All of these

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Engineering Mechanics
For any system of coplanar forces, the condition of equilibrium is that the

Algebraic sum of the horizontal components of all the forces should be zero
Algebraic sum of moments of all the forces about any point should be zero
Algebraic sum of the vertical components of all the forces should be zero
All of these

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