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

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Engineering Mechanics
The static friction

Is independent of the area of contact, between the two surfaces
Always acts in a direction, opposite to that in which the body tends to move
All of these
Bears a constant ratio to the normal reaction between the two surfaces

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Engineering Mechanics
Non-coplanar concurrent forces are those forces which

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

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