Strength of Materials
Coulomb friction is the friction between

solids and liquids
two lubricated surfaces
two dry surfaces
bodies having relative motion

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

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

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