Strength of Materials
A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if

the floor and wall both are rough sur-faces
the floor is smooth, the wall is rough
the floor and wall both are smooth surfaces
the floor is rough, the wall is smooth

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

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