The kinematic indeterminacy (Dk) of a pin-jointed space frame is given by which of the following equations, where 'j' is the number of joints and 'r' is the number of support reactions?

What is the value of maximum shear force for a simply supported beam of length 6.0 m, subjected to a uniformly distributed load (w kN/m) throughout the span, for which the bending moment equation at a section from the left support situated at 'x' m is Mx = 30x - 0.5(wx2)?

Method of joints is applicable to calculate member forces of a truss, when the number of unknown forces at the joint under consideration is not more than: