Strength of Materials
If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either

at least two of them must meet
meet in a point
All of the listed here
be all parallel

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Strength of Materials
In the equation of virtual work, following force is neglected

reaction of any smooth surface with which the body is in contact
reaction at a point or an axis, fixed in space, around which a body is con-strained to turn
All of the listed here
reaction of a rough surface of a body which rolls on it without slipping

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