Problem $3(40/100)$

If a truss member with a solid circular cross$-$sectional profile and a diameter of $4$ in sustains a

tensile force of $120lb,$ what is the normal stress on the section.

What happens to the normal stress if we increase the section to a $5$ in diameter?

If a beam with a solid rectangular cross$-$sectional profile of $2$ in $4$ in sustains a shear force and

a bending moment of $40lb$ and $600lb-$in$,$ respectively, calculate the maximum shear stress and

maximum bending stress on the section.

What happens to the stresses if we increase the height of the element to $6$ in$?$For the structure below, determine the reactions and calculate the internal forces in the designated

locations $($dashed line$).$