The figure illustrates a number of beam sections. Use an allowable bending stress of 1.2 kpsi for wood and 12 kpsi for steel and find the maximum safe uniformly distributed load that each beam can carry if the given lengths are between simple supports.
(a) Wood joist 1 ½ by 9 ½ in and 12 ft long
(b) Steel tube, 2 in OD by 3/8 -in wall thickness, 48 in long
(c) Hollow steel tube 3 by 2 in, outside dimensions, formed from 3/16 -in material and welded, 48 in long
(d) Steel angles 3 X 3 X ¼ in and 72 in long
(e) A 5.4-lb, 4-in steel channel, 72 in long
(f) A 4-in .1-in steel bar, 72 in long