For the following problems use an allowable stress equal to 25 ksi for both tension and compression. Calculate the volume of the truss. PART A. Use the beam-truss analogy to design the following truss. PART B. Perform the structural analysis of the truss and design each member using its actual internal force. Compare the truss volume to the one of PART A.

The two vertical steel [E = 200 GPa] rods that support rigid bar ABCD are initially free of stress. Rod (1) has an area of A1 = 410 mm2 and a length of L1 = 3.2 m. Rod (2) has an area of A2 = 355 mm2 and a length of L2 = 1.3 m. Assume dimensions of a = 3.4 m, b = 1.2 m, and c = 1.5 m. After a load of P = 50 kN is applied to the rigid bar at D, determine: (a) the normal stresses in rods (1) and (2) (b) the magnitude of the downward deflection of the rigid bar at D. y,v (2) L2 a B C D x,u Rigid bar |(1) Answer: (a) o1 = i MPa 02 = i MPa (b) VD = i mm

Please help on the 3 questions in the photo

B 900 N Determine the force in each 1.2 m member of the truss and A D indicate whether the members 0.9m 1.5m are in tension or 2700 N compression.