a piping system has an internal air pressure of 1,500 kpa. In addition to being subject to the air pressure, the piping supports a vertical load of 9 kn and a horizontal load of 13 kn ( acting in the +x direction) at flange A. The pipe has an outside diameter D=200 mm and an inside diameter d=176 mm, and the weight of the pipe is neglected. Determine the state of stress at point k in the current coordinate system, (b) show these stress