$2\mathrm{.}50$ The concrete post and $\{$:${}_c=5\mathrm{.}5\frac{{10}^{-6}}{}F)$ is

reinforced with six steel bars, each of $\frac{7}{8}-$in$.$ diameter

and $\{$:${}_s=6\mathrm{.}5\frac{{10}^{-6}}{}F).$ Determine the normal

stresses induced in the steel and in the concrete by a temperature

rise of $65F\mathrm{.}2\mathrm{.}50$ The concrete post and $\{$:${}_c=5\mathrm{.}5\frac{{10}^{-6}}{}F)$ is

reinforced with six steel bars, each of $\frac{7}{8}-$in$.$ diameter

and $\{$:${}_s=6\mathrm{.}5\frac{{10}^{-6}}{}F).$ Determine the normal

stresses induced in the steel and in the concrete by a temperature

rise of $65F.$

$2\mathrm{.}51$ A rod consisting of two cylindrical portions $AB$ and $BC$ is

restrained at both ends. Portion $AB$ is made of steel $,$

$\{$:${}_s=11\mathrm{.}7\frac{{10}^{-6}}{}C)$ and portion $BC$ is made of brass

GPa,${}_b=20\mathrm{.}9\frac{{10}^{-6}}{}C).$ Knowing that the rod is initially

unstressed, determine the compressive force induced in ABC

when there is a temperature rise of $50C.$

solve $2\mathrm{.}50$ please