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 400-N load represents the effect
of wind pressure. Determine the equivalent force–couple system at A. Also, compute the x-intercept of
the line of action of the system resultant treated as a single force R.