4.0 A contractor has a project to construct a large industrial plant and has decided to use a crawler crane with a lattice boom to support steel erection. The contractor has analyzed his lift requirements and determined that the longest operating radius required will be 50 feet and the highest reach required will be 65 feet. The maximum vertical reach was selected to ensure clearance of the hook and load above the structure being constructed. The bottom of the boom is mounted on the crane superstructure 5 feet above the ground, and the hook and slings required to move the steel elements weigh 1,000 pounds. Rated lifting capacities for the crane are shown in Table 2. (100 Points) a What length of boom should the contractor mount on the crane for this project? b. What is the maximum load the crane can lift safely at an operating radius of 50 feet with the boom selected in a Table 2: Rated Lia Capacity for Crawler Crane with Lattice Boom Operatine Radio 60 80 100 120 1403 10 15 Boom Ligh 40 80.000 lb 44,480 lb 20.550 21.0106 17.220 B 1400 11.780 2011 25 30 35 I 44,310 10 29,370 21.660 lb 1660 13.800 15,510 b. 39.050 IN 21.330 Ib TO IN 11.16 BOD MUIN 4.730 3.700 son . 70 28720 20,000 lb 10200 IRONO IN 07 7.710 5,740 4. 33.0 ON 19 20.610 lb 15,870 12.900 10, 7.30 Sib 3,00 3.9.2010 2.16 1. toit 1.400 15.500 12,300 10.000 6,010 4,90 1,550 lb 2,540 1000 Foto