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

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Strength of Materials
Limiting force of friction is the

Ratio of limiting friction and normal reaction
The friction force acting when the body is just about to move
Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction
the friction force acting when the body is in motion

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

reaction at a point or an axis, fixed in space, around which a body is con-strained to turn
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
All of the listed here

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