The assembly consists of two sections of galvanized steel pipe connected together using a reducing coupling at b. the smaller pipe has an outer diameter of 0.75 (in.) and an inner diameter of 0.68 ( whereas the larger pipe has an outer diameter of 1 (in.) and an inner diameter of 0.86 ( if the pipe is tightly secured to the wall at c, determine the maximum shear stress developed in each section of the pipe when the couple shown is applied to the handles of the wrench. also, draw stress distribution at 12 o'clock and 3 o'clock on any section cut between a and b so that it would be visible to the person tightening the pipe.