Engineering Mechanics
A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. 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

Slant down towards direction of pull
Remain horizontal
Slant up towards direction of pull
None of these

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Engineering Mechanics
Non-coplanar concurrent forces are those forces which

Meet at one point and their lines of action also lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane
Do not meet at one point, but their lines of action lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane

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Engineering Mechanics
Angle of friction is the

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

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Engineering Mechanics
Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then

The algebraic sum of their moments about any point in their plane is zero
The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point
Their algebraic sum is zero
Their lines of action are at equal distances

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