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QUESTION 1 (30 marks) A pin-jointed truss frame ABCDEF shown in Figure 1 is supported by a hinge joint of point A & a roller joint at point D. Two external loads are applied at points C and B respectively 3m 8 kN B 2.5m F 4.5m 10 N CY E 2.5m D Figure 1 (a) Draw the free-body diagram of the entire truss and determine the support reaction forces at points A and D. Indicate also, without any calculation, the zero-force member(s) in the above truss (10 marks) Determine, denoting whether the force in each member(s) as either compression or tension: (b) the forces in members FE & BE using the Method of Sections, with the aid of a free- body diagram of the relevant section, and (15 marks) (c) the force in member CD using the Method of Joints, with the aid of a free-body diagram of the relevant joint (5 marks)