Ahollow steel [e = 30,000 ksi] tube (1) with an outside diameter of 3.250 in. and a wall thickness of 0.375 in. is fastened to a solid aluminum [e = 10,000 ksi] rod (2) that has a 1.750-in.-diameter and a solid 1.125-in.-diameter aluminum rod (3). the bar is loaded as shown. assume l1 = 70 in., l2 = 40 in., l3 = 27 in., r = 35 kips, q = 16 kips, and p = 28 kips. determine (a) the change in length of steel tube (1). (b) the deflection of joint d with respect to the fixed support at a. (c) the maximum normal stress in the entire axial assembly.