Question: 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

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 ${ }^{0} \mathrm{~F}, \alpha_{c u}=9.5 \times 10^{-6} \mathrm{per}^{0} \mathrm{~F}$.

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