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 width (b), is

bd³/36
bd³/12
db³/12
db³/36

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Engineering Mechanics
For any system of coplanar forces, the condition of equilibrium is that the

All of these
Algebraic sum of the vertical components of all the forces should be zero
Algebraic sum of the horizontal components of all the forces should be zero
Algebraic sum of moments of all the forces about any point should be zero

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