1. (10) P1.9 Determine the normal stress in bar (1) for the mechanism shown in Figure P1.9. The area of bar (1) is 2,600 mm². The distrib- uted load intensities are wc = 12 kN/m and wp = 30 kN/m. Use the following dimensions: a = 7.5 m and b = 3.0 m. b B b (1) a WC D WD