The two rods below are constrained between two rigid walls. $AB$ is brass $20\mathrm{.}9{10}^{-6}\frac{m}{mC})$ and $BC$ is aluminum $(($:$E_{Al}=72$GPa,$a_{Al}=23\mathrm{.}9{10}^{-6}\frac{m}{m*C}\}.$ At $T_1=10\mathrm{.}8C,$ there is no stress in the rods. Determine the stress in the brass rod $AB$ at $T_2=60\mathrm{.}9C.$

Use the following dimensions:

$d_1=65mm$

$d_2=38mm$

$L_1=1\mathrm{.}3m$

$L_2=1\mathrm{.}44m$

Calculate your answer to one decimal place, and use a $\text{'}-\text{'},$ if necessary.

Input your answer in MPa

Hint: Assume all deformation is elastic.

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