दो-हिंज वाले मेहराब (two-hinged arch) की स्थैतिक अनिर्धार्यता (static indeterminacy) की डिग्री क्या है?

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: