Strength of Materials
If three forces acting in different planes can be represented by a triangle, these will be in

partial equilibrium
non-equilibrium
unpredictable
full equilibrium

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

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

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Strength of Materials
According to principle of transmissibility of forces, the effect of a force upon a body is

Maximum when it acts at the center of gravity of a body
The same at every point in its line of action
Different at different points in its line of action
Minimum when it acts at the C.G. of the body

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