A structural element supports loads of P at C in z direction and P at B in x direction on the bar (with a cross-section area of A, the area moment of inertia of I and Young's modulus of E) shown in the Figure below. Neglecting transverse shear stress, and any stress concentrators in the bar. a) Compute the strain energy stored in the bar (in terms of P, P2, L1, L2, E, A, and I). b) Use Castigliano's Theorem to determine the deflection in direction z of point C. ZA . A X 4 PV B L P2