Figure 800 N H F E MA 3m -3m 30% < 1 of 2 ( B Figure B 2m-2m- 2m <2 of 2 4m D 700 N 500 N Identify the zero-force members in the truss shown in (Eigure 1) Check all that apply. OCD OBC 0 0 0 0 0 0 0 0 0 0 0 OCE O AB ODE GH EF BG D CF AG OBF FG Identify the zero-force members in the truss shown in (Eigure 2). Check all that apply. ооооооооо O BC OFG CF AG BG CD ODE OAB DCG OEF

A large precast concrete panel for a warehouse is raised using two sets of cables at two lift lines, as shown in the figure part a. Cable 1 has a length L1 = 22 Ft, cable 2 has a length L2= 10 ft, and the distance along the panel between lift points Band D is d = 14 ft (see figure part b). The total weight of the panel is W = 85 kips. Assuming the cable lift Forces F at each lift line are about equal, use the simplified model of one half of the panel in figure part b to perform your analysis for the lift position shown. Find the required cross-sectional area AC of the cable if its breaking stress is 91 ksi and a factor of safety of 4 with respect to failure is desired.

Solve Problem 11.3-3 for a W 10 × 45 steel column having a length L = 28 ft.

-11 A rubber cube R of a side L = 3 in. and cross- sectional area A = 9 in2 is compressed inside a steel cube S by a force F = 5 lb that applies uniformly distributed pressure to the rubber. Assume E 0.3ksi and,, = 0.45. (a) Calculate the lateral pressure between the rubber and steel (disregard friction between the rubber and the steel, and assume that the steel block is rigid when compared to the rubber). (b) Calculate the change in volume of the rubber.