A composite rod of steel and copper of lengths \(1.5 \mathrm{~m}\) and \(1 \mathrm{~m}\) respectively is clamped at the ends, as shown in Fig. 13.43. Its temperature is then raised by \(50^{\circ} \mathrm{C}\). Calculate the stresses in the two metels of rod \(E_{s}=210 \mathrm{GPa}, E_{c}=105 \mathrm{GPa}, \alpha_{s}=10 \times 10^{-6} \mathrm{per}^{\circ} \mathrm{C}\) and \(\alpha_{c}=15 \times 10^{-6}\) per \(^{\circ} \mathrm{C}\).