A simple beam with span length L $=2$ m is subjected to a uniform load of

intensity q $=60$ kN$/$m $($see figure:$2).$ The beam has a rectangular cross

section with width b $=50$ mm and height h $=150$ mm$.($a$)$ Determine

the maximum normal stress due to the load q$.($b$)$ Also determine the

normal stress at point C located by the distances c $=500$ mm and d $=$

$25$ mm$.$