Problem $1(10$ points$).$ The beam shown has a cross$-$sectional area in the shape of a channel. Determin the maximum bending stress that occurs in the beams at section a$-$a$.$ Solution is Example $\backslash (6\mathrm{.}13\backslash )$The beam shown has a cross$-$

sectional area in the shape of a

channel. Determine the

maximum bending stress that

occurs in the beam at section $a-$

a$.$