A $13-$ft$-$long simply supported timber beam carries a $P=22$ kips concentrated load at midspan as shown. The cross$-$

sectional dimensions of the timber are also shown. At section a$-$a$,$ located $A=4ft$ from the left.

in$,$ and $K=4in$

What is the shear stress at point $H$ at cross section $a-a?$

$45\mathrm{.}36$

$23\mathrm{.}87$

$4\mathrm{.}07$ psi

$37\mathrm{.}57$ psi

$32\mathrm{.}57$ psi