$1.$M$=15\mathrm{.}5$kN$-$m and is

oriented as shown. Assume b$\_($f$)=170$mm$,$t$\_($w$)=12$mm$,$t$\_($f$)=18$mm$,$d$=250$mm and $\backslash$theta $=42\backslash$deg $.$ Determine:

$($a$)$ the bending stress $\backslash$sigma $\_($H$)$ at point H$.[\backslash$sigma $\_($H$)=-75\mathrm{.}3$MPa$]$

$($b$)$ the bending stress $\backslash$sigma $\_($K$)$ at point K$.[\backslash$sigma $\_($K$)=75\mathrm{.}3$MPa$]$

$($c$)$ the orientation angle $\backslash$beta of the neutral axis relative to the $+$z axis; show its location on a sketch of the cross

section. $\backslash$beta $=79\mathrm{.}9\backslash$deg