We are going back to the exact same problems from Homework $18$ except we will now consider

shear stress. The distributed load has a value of $q=-2k\frac{N}{m}$ and the beam span length is $4$

meters. I re$-$did the distances you need in $mm.$ You do not have to draw the shear diagram. You

can "remember" that the maximum shear force is $q\frac{L}{2}$ at the left $($and right support$).$ So V$=4$ kN$.$

Use that. Recall that the centroid is halfway up $($at $10cm)$ and $I=27\mathrm{.}79{10}^{-6}{m}^4.$ You do not have

to compute those again. Find the shear stress at three locations: a$)$ at the centroid, where it will

be a maximum; $b)$ at the interface between the web and flange $($there are two webs in this

problem$)$ but in the web; c$)$ at the interface but in the flange. $,$ all MPa$).$