(Solved): The compound bar shown in the Figure 3 is composed of the bronze, aluminum and steel segments and is ...

The compound bar shown in the Figure 3 is composed of the bronze, aluminum and steel segments and is initially stress-free. Compute the following if the temperature dropped to 20°C. Assume that the walls do not yield and use the following data given. 
a. Stress in aluminum, in MPa
b. Stress in bronze, in MPa
c. P of steel, in kN

\begin{tabular}{lccc} & A \( \left(\mathrm{mm}^{2}\right) \) & a \( (\Gamma \mathrm{C}) \) & \( E(G \mathrm{Ca}) \) \\ \hline Brocare segment & 2000 & \( 19.0 \times 10^{-4} \) & 83 \\ Ahuminum segment & 1400 & \( 23.0 \times 10^{-4} \) & 70 \\ Steel segment & 800 & \( 11.7 \times 10^{-4} \) & 200 \end{tabular}