PRACTICE QUESTION 7 Identify the zero-force members in the Pratt roof truss by inspection. Justify your answers using appropriate joint free-body diagrams. 400 N 300 N D E F 3 m B A LK JI H 12 m, 6 @ 2 m Zero-force members: BL, BK, KC, HF, FI, IE, EJ PRACTICE QUESTION 8 Consider the truss below. Determine the forces in members DE, EJ, and JI using the method of sections and indicate if the members are in tension or compression. B A 400 N 300 N D E 3 m LK JIH 12 m, 6 @ 2 m