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

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

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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 are parallel
these forces are equal
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

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