A hollow steel (E = 30,000 ksi) tube (1) with a cross-sectional area of 2 in² is fastened to a solid aluminum (E = 10,000 ksi) rod (2) that has a cross-sectional area of 3 in² and a solid aluminum rod (3) with a cross-sectional area of 1.5 in². The bar is loaded as shown. a) Determine the force in sections (1), (2), and (3) of the rod. b) Determine the deflection of point D with respect to fixed support A. 34 kips A ト 18 kips 25 kips (1) (3) C B 34 kips 18 kips 60 in. 40 in. 30 in.