1 Problem 2: The two-bar truss ABC shown in below figure has pin supports at points A and C, which are 2.0 m apart. Members AB and BC are steel bars, pin connected at joint B. The length of bar BC is 3.0 m. A sign weighing 5.4 kN is suspended from bar BC at points D and E, which are located 2.0m 0.8 m and 0.4 m, respectively, from the ends of the bar. Determine a) The required cross-sectional area of bar AB, and (15 points) b) The required diameter of the pin at support C (15 points) If the allowable stresses in tension and shear are 125 MPa and 45 MPa, respectively. (Note: The pins at the supports are in double shear. Also, disregard the weights of members AB and BC.) 0.8 m -0.9 m--0.9 m 0.4 m W-5.4 KN