Strength of Materials
If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either

at least two of them must meet
All of the listed here
be all parallel
meet in a point

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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 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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Strength of Materials
In actual machines

mechanical advantage is greater than velocity ratio
mechanical advantage is less than velocity ratio
mechanical advantage is unity
mechanical advantage is equal to velocity ratio

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