Strength of Materials
The center of gravity of a uniform lamina lies at

the mid point of its axis
the bottom surface
All of these
the center of heavy portion

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

All of the listed here
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

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