Engineering Mechanics
Which is the correct statement about law of polygon of forces?

If a polygon representing forces acting at a point is closed then forces are in equilibrium
If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium
If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium
If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium

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Engineering Mechanics
A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. 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

None of these
Slant up towards direction of pull
Slant down towards direction of pull
Remain horizontal

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Engineering Mechanics
Non-coplanar non-concurrent forces are those forces which

None of these
Do not meet at one point but their lines of action lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane

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