EG1109 Statics and Mechanics of Materials Quiz 1 (2005/06 Semester 1) Question 1 The signâ€™s weight Ws = 160 N acts at the point shown in Figure Q1. The 50 N weight of the bar AD acts at the midpoint of the bar. Determine the tension in the cable AE and the reactions at D . 0.15 m 0.60 m 0.25 m E 30o 20o A B WALL Bicyle Rentals Ws C D 0.65 m Figure Q1 T = 145.8 N #(ANS) Dx = 137 N #(ANS) D y = 160.1 N #(ANS) Question 2 The roof truss in Figure Q2 is subjected to wind load which may be modeled as concentrated loads acting perpendicular to the windward side at joints A, E and F . The magnitudes of the loads are as shown in Figure Q2. Determine the forces in members CD , DE and CG. Triangle CDF is an equilateral triangle and joints E and G are at the midpoints of their respective sides. 10 kN F 8 kN 5 kN G E 3m C D B A 3m 2m 3m Figure Q2 FCD = 20.2 kN (Tension) #(ANS) FCG = 0 kN #(ANS) FDE = 10.4 kN (Compression) #(ANS)