The asymmetric roof truss is of the type used when a near normal angle of incidence of sunlight onto the south-facing surface ABC is desirable for solar energy purposes. The five vertical loads represent the effect of the weights of the truss and supported roofing materials. The 360-N load represents the effect of wind pressure. Determine the equivalent force-couple system at A. The couple is positive if counterclockwise, negative if clockwise. Also, compute the x-intercept of the line of action of the system resultant treated as a single force R. 360 N B 680 N C 680 N 680 N E 340 N 340 N A 60 30 30 30 F G 5.6 m Answers: Force-couple system R = ( i MA= 5.6 m i+ N-m j) N