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
V5 and V5
3 and 1 kg
2 and 5

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Strength of Materials
In ideal machines

mechanical advantage is greater than velocity ratio
mechanical advantage is less than velocity ratio
mechanical advantage is unity
mechanical advantage is equal to velocity ratio

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Strength of Materials
A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

remain horizontal
slant up towards direction of pull
unpredictable
slant down towards direction of pull

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

All of the listed here
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

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