Strength of Materials
The center of gravity of a triangle lies at the point of

Intersection of its altitudes
Intersection of bisector of angles
Concurrence of the medians
Intersection of diagonals

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

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