Problem $4\mathrm{.}12$

$4\mathrm{.}12$ Solve Prob. $4\mathrm{.}11,$ assuming that the beam is bent about a yertical axis and that the bending moment is $900N*m.$

$4\mathrm{.}11$ Knowing that a beam or the cross section shown is bent about a horizontal axis and that the bending moment is $900N*m,$ determine the total force acting on the shaded portion of the heam.

The stress distribution over the entine cross section is given by the bending stress formula

${}_x=-\frac{My}{\text{I}}$