A hollow steel (E= 30,000ksi) tube (1) with an outside diameter of 2.75in. and a wall thickness of 0.25in. is fastened to a solid aluminum (E= 10,000 ksi) rod (2) that has a 2in. diameter and a solid 1.375in. diameter aluminum rod (3). The bar is loaded as shown in the figure. Determine (a) the change in length of steel tube (1); (b) the deflection of joint D with respect to the fixed support A. (c) the maximum normal stress in the entire axial assembly

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