Engineering Mechanics
Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is

bd³/36
db³/12
db³/36
bd³/12

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Engineering Mechanics
The static friction

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

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Engineering Mechanics
Non-coplanar concurrent forces are those forces which

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