Question $2$:

A cantilevered steel beam $)=(1\mathrm{.}80m$ carries a concentrated load of $60\mathrm{.}0kN$ at its free end.

The maximum allowable bending normal stress $(f_{\text{b}\text{M}\text{A}\text{x}})$ in the section is $+-125$MPa. The maximum allowable bending shear stress $(f_{\text{v}\text{M}\text{A}\text{x}})$ in the section is $70\mathrm{.}0$MPa.

Find the lightest steel W$-$shape that satisfies both stress conditions.

Hint: Select the section from the steel tables based on bending normal $($flexural$)$ stress requirements, then check the bending shear stress requirements.

Use the General Shear Formula.

Recall that Section Modulus $=S=\frac{1}{y}$