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QUESTION 1 (25 marks) External forces are applied to a pin-jointed truss, supported by frictionless rollers at D and hinged at E, as shown in Figure 1. (a) Identify all zero-force members without any calculation. (2 marks) www Determine, stating whether the members are in tension or compression: (b) the forces in members BC and GF, using the Method of Sections, with the aid of free-body diagram of the relevant section, (9 marks) (c) the reaction at the rollers at point D, with the aid of free-body diagram of the entire truss, and (5 marks) (d) the forces in members CD and DE, using the Method of Joints, with the aid of free-body diagram of the relevant joint. (9 marks) 25° 3 m 8 kN G 5 kN F 3 m A B C mon 3 m MOMONEMORE 6 m Figure 1 Ans: BG, BF, 13.07 kN (C), 7.5 kN (T), 13.38 kN, - 16.08 KN (C), 8.92 kN (T)