$2$

$\frac{0}{1}$ point

A rectangular bar of dimensions $b$hmm is subjected to a combined bending load as shown. For $b=12mm,h=25mm,$ and $My=110Nm,Mz=72Nm,$ determine the bending stress at point B$.[$Mpa$]($sign sensitive: positive for tensile stress, negative for compressive stress$)$