The beam supports the triangular distributed load shown below with wmax = 500 lb/ft. The reactions at A and B are vertical. (Figure 1) W B D C E 6ft 6 ft 6ft 4.5 ft 4.5 ft Determine the magnitude of the resultant internal normal force on the cross section at point D. Determine the magnitude of the resultant internal shear force on the cross section at point D. Determine the magnitude of the resultant internal bending moment on the cross section at point D. Determine the magnitude of the resultant internal normal force on the cross section at point E. Determine the magnitude of the resultant internal shear force on the cross section at point E Determine the magnitude of the resultant internal bending moment on the cross section at point .