Problem 2 (3pts) the horizontal rigid beam abcd is supported by vertical bars (1) and (2) and is loaded at points a by vertical force p = 30 kn. bar (1) is made of aluminum [e = 70 gpa] and has a cross-sectional area of 200 mm2 and a length l1 = 8.0 m. bar (2) is made of steel [e = 200 gpa] and has a crosssectional area of 300 mm2 and a length l2 = 5.0 m. assume dimensions a = 2.5 m, b = 2.0 m, and c = 1.50 m. determine the deflection of the rigid beam (a) at point a and (b) at point d.