Strength of Materials
A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal

metal is twice as dense as water
density of metal can’t be determined
metal will float in water
metal is twice as dense as unknown fluid

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Strength of Materials
Center of percussion is

the point of C.G.
point of suspension
the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
the point of metacentre

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

reaction of a rough surface of a body which rolls on it without slipping
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

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