Strength of Materials
If a rigid body is in equilibrium under the action of three forces, then

the lines of action of these forces are parallel
these forces are equal
the lines of action of these forces meet in a point
the lines of action of these forces meet in a point & the lines of action of these forces are 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

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

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Strength of Materials
According to Lami's theorem

If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium
Three forces acting at a point can be represented by a triangle, each side being proportional to force
Three forces acting at a point will be in equilibrium
If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

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