A $4$ ft long $2014-$T$4$ aluminum bar with the cross section shown below is subjected to a compressive axial load. See the table of material properties on the second page of this assignment. Assume that the bar is supported in a way such that the end condition factor k is $1\mathrm{.}0($the ends are pinned$).$

a$.$ What compressive load is expected to cause failure by yielding?

b$.$ What compressive load is expected to cause failure by buckling? Remember that buckling will occur about the axis with the smaller value of I.