Only problem $2$ please! The answer is provided, but I$\text{'}$m confused about the steps for getting there. Thank you!

The beam's cross$-$section remains the same along x direction, which is a solid rectangle wit

a width b$=0\mathrm{.}2$m and height h$=0\mathrm{.}4$m$.$ Find out

the maximum magnitude $($absolute value$)$ of shear stress and

the location $($in terms of x$,$y$,$z $)$ of maximum magnitude of shear stress tau$\_($xy$)$ in this beam

Final answers: $1)$ max shear stress is $1\mathrm{.}12$ kPa $.2)$ You need to find the x$,$y coordinates $-$

by yourself.

The load is same as problem $1$

Find the shear stresses at points A$,$ B$,$ B$\text{'},$ C$,$ D$,$ and E on the cross$-$section, all of which point

are located on a cross$-$section that is $1\mathrm{.}5$ meters away from the left end of the beam $($ x$=1\mathrm{.}5$

m$).$

Where are the points: A and E are on top and bottom surfaces, respectively. B and B$\text{'}$

are two points on both sides of the surface, which is $4$ cm below the top surface. C is the

centroid of the whole cross$-$section. D is $4$ cm above the bottom surface.