Question $2$: $(25$ point $)$ The aluminum rod $)=10\mathrm{.}1{10}^6,=(12\mathrm{.}9{10}^{-6}\frac{1}{}F$ which consists of two cylindrical portion $AB$ and $BC.$ Determine the deformation of aluminum rod under the load and change of temperature $)=(30F$

E is in psi and show alp steps in solving.