Strength of Materials
The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60° produce resultant of Vl3 kg. These forces are

2 and V6
3 and 1 kg
V5 and V5
2 and 5

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Strength of Materials
Center of percussion is

the point of C.G.
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
point of suspension

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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
All of the listed here
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

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