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

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

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Strength of Materials
A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

remain horizontal
slant down towards direction of pull
slant up towards direction of pull
unpredictable

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