Determine $P_n,$ for each of the columns, using AISC Specification and $F_y=50$ksi, unless noted otherwise.

$($a$)$ W$10$x$77$ with $KL=20ft($Solution: $548$ k $)$

$($b$)$ None

$($c$)$ WT$6$x$25$ with KL $=12$ft $($Solution: $182$ k $)$

Determine $P_n,$ for each of the columns, using AISC Specification and $F_y=50$ksi, unless noted otherwise.

$($a$)$ W$10$x$30$ with pinned ends, $L=10ft($Solution: $226\mathrm{.}8$ k $)$

$($b$)$ AN HP$8$x$36$ with fixed ends, L$=20$ft $($Solution: $299$ k $)$

$($c$)$ An HSS$6$x$4$x$1/4,F_y=46$ksi with pinned ends, $L=12ft($Solution: $108$ k $)$