A load P is supported by a structure consisting of rigid bar ABC, two identical solid aluminum alloy [E = 73 GPa] rods (1), and a solid bronze [E = 105 GPa] rod (2), as shown in Figure P5.23. The aluminum rods (1) each have a diameter of 12 mm and a length of L_1 = 2.3 m. They are symmetrically positioned relative to middle rod (2) and the applied load P. Bronze rod (2) has a diameter of 18 mm and a length of L_2 = 1.6 m. If all bars are unstressed before the load P is applied, determine the normal stresses in the aluminum and bronze rods after a load of P = 50 kN is applied to the rigid bar.