Strength of Materials
The necessary condition for forces to be in equilibrium is that these should be

Meet at one point
Coplanar & Meet at one point
Coplanar
All be equal

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

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

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Strength of Materials
Kinetic friction is the

The friction force acting when the body is just about to move
Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
Ratio of limiting friction and normal reaction
The friction force acting when the body is in motion

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