Question Three: $(40$ points$)$ The concrete bar shown below is $10ft$ in length with a square cross$-$

section, $10$ inches sides, and is subjected to an axial tensile force of $5$ Kips.

Find the axial stress in the bar in units $lb./$in ${?}^2($psi$)(10$ points$).$

If the bar is made of concrete with a strength of $35$ psi, what is the maximum axial force

that can be applied to the bar in kips? $(10$ points$)$

Will the concrete bar fail based on the stress you calculated in the first part of the question and

knowing that the bar is made of concrete with a strength of $35$ psi? $(10$ points$)$

If the bar will fail under the applied load, what should be the minimum area of the bar in units

$i{n}_{{?}^{?}}(2)$ so it can safely handle the applied $5-$kip load? $(10$ points$)$

Hint: You should calculate the required area using the strength of the material the bar is made

of and the applied load on the bar $(5$ kips$).$