Q$5$

A beam has a section as shown in Figure Q$5.$

When subjected to a bending moment in the plane YY $,$ the tensile stress at the bottom edge is $60$ MPa $.$ Find:

$($a$)$ The position of the neutral axis $($ZZ$)$ of the section.

$(25\%)$

$($b$)$ The second moment of area about ZZ$.$

$(25\%)$

$($c$)$ The value of the bending moment.

$(25\%)$

$($d$)$ The stress at the top edge. Confirm whether this stress is tensile or compressive.

$(25\%)$