A compound bar is shown in Fig. 13.42. Its temperature is raised by \(120^{\circ} \mathrm{F}\). Calculate the stresses in each metal and the change in length. \(E_{s}=210 \mathrm{GPa} E_{c u} 105\) GPa. \(\alpha_{s}=6.5 \times 10^{-6}\) per \({ }^{0} \mathrm{~F}, \alpha_{c u}=9.5 \times 10^{-6} \mathrm{per}^{0} \mathrm{~F}\).