Strength of Materials
According to principle of moments

if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
positive and negative couples can be balanced
if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point

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Strength of Materials
If a rigid body is in equilibrium under the action of three forces, then

the lines of action of these forces meet in a point
the lines of action of these forces meet in a point & the lines of action of these forces are parallel
the lines of action of these forces are parallel
these forces are equal

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Strength of Materials
Which one of the following statements is not correct

the tangent of the angle of repose is equal to coefficient of friction
the tangent of the angle of friction is equal to coefficient of friction
the sine of the angle of repose is equal to coefficient to friction
the angle of repose is equal to angle of friction

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