Question $3$d

Point A is supported by an I$-$beam named $\backslash (\backslash$mathrm$\{$A$\}-\backslash$mathrm$\{$C$\}\backslash ),$ assume a value of $\backslash (7\backslash$mathrm$\{$kN$\}\backslash$uparrow $\backslash )$ for the result of question c as reaction force in point A $.$ Does RA result in a compressive $($compress $\backslash (\backslash$mathrm$\{$A$\}-\backslash$mathrm$\{$C$\}\backslash ))$ stress or tensile $($stretch A$-$C$)$ stress in AC$?$

Question $3$e

Using the value $\backslash (7\backslash$mathrm$\{$kN$\}\backslash$uparrow $\backslash )$ as reaction force in point A $,$ calculate the difference in length $(\backslash (\backslash$Delta $\backslash$mathrm$\{$L$\}\backslash ))$ over A$-$C$,$ use Hooke's law and note the result in mm and an accuracy of $2$ decimals. AC has a length of $2,5$m and a Young's modulus of E$=210$GPA.

Question $3$f

Calculate the resulting stress $\backslash (\backslash$sigma $\backslash )$ over the cross section of A$-$C$,$ note the values in MPA with an accuracy of $2$ decimals. The yield limit $\backslash (\backslash$sigma$\_\{0\mathrm{.}2$ R p$\}\backslash )$ of the steel used is $235$MPA, is the deformation plastic $($permanent$)$ or elastic?