A rigid bar is suspended from three rods and loaded as shown in Fig.13.63. The crossssectional area of copper,steel and aluminium rods are \(100 \mathrm{~mm}^{2}\) and \(150 \mathrm{~mm}^{2}\) respectively Calculate the stresses in the rods. Take \(E_{s}=200 \mathrm{GPa}, E_{c}=100 \mathrm{GPa}\), and \(E_{a}=70 \mathrm{GPa}\).

1.5m Cu Steel 1.0m 1m' 40. 0.5m-0.5m. Fig. 13.63 40 kN 1.5m