The A992 steel drill shaft of an oil well extends 12000 ft into the ground. Assuming tha...

The A992 steel drill shaft of an oil well extends 12000 ft into the ground. Assuming that the pipe used to drill the well is suspended freely from the derrick at A , determine the maximum average normal stress in each pipe segment and the elongation of its end D with respect to the fixed end at A . The shaft consists of three different sizes of pipe, AB , BC , and CD , each having the length, weight per unit length, and cross-sectional area indicated.