The algebraic sum of moments of the forces forming couple about any point in their plane is________?

The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60° produce resultant of Vl3 kg. These forces are________?

In prestressed concrete________?

The purpose of reinforcement in prestressed concrete is________?

The shape factor of an isosceles triangle for bending about the axis parallel to the base is________?

If a three hinged parabolic arch, (span l, rise h) is carrying a uniformly distributed load w/unit length over the entire span________?