Stepped cantilever beam with a square cross section, has a free end at A, is fixed at C and loaded at B with bending moment M0. Given: L = 24.0in, M0 = 100.0lb-in, E = 10.0Msi, \nu = 0.3, I = 0.0052in4. a) with Principle of Stationary Potential energy derive symbolically (by hand) expression for vertical deflection at point A and rotation at point B.