2-86. Loading Structure, Stark and Nichole (1972). The overhead crane in Figure 2.14 with two lifting yokes is used to transport mixed concrete to a yard for casting concrete barriers. FIGURE 2.14 Overhead crane with two yokes (Problem 2-86) 2 ft 6 ft 8 ft 12 ft 2 ft Crane girder Yoke 1 Yoke 2 w W2 hapter 2 Modeling with Linear Programming The concrete bucket hangs at midpoint from the yoke. The crane end rails can support a maximum of 25 kip each, and the yoke cables have a 20-kip capacity each. Determine the maximum load capacity, W and W2. (Hint: At equilibrium, the sum of moments about any point on the girder or yoke is zero.)