a circular nylon pipe supports a downward load pa 510kn, which is uniformly distributed around a cap plate at the top of the lower pipe. a second load pb 5 20 kn is applied upward at the top. the inner and outer diameters of the upper and lowerpartsofthepipeared1 550 mm,d2 560 mm, d3 5 55 mm, and d4 5 65 mm, respectively. the bot- tom pipe has length 400 mm and the upper pipe has length 300 mm. (a) calculate the axial normal stress in each pipe segment. (b) calculate the strain in each pipe segment if the elongation of the upper pipe is 3.29 mm and the elongation of the bottom part is 1.25 mm.