$5-5.$ The copper pipe has an outer diameter of $2\mathrm{.}50$ in $.$ and an inner diameter of $2\mathrm{.}30$ in $.$ If it is tightly secured to the wall and three torques are applied to it$,$ determine the shear stress developed at points A and $B.$ These points lie on the pipe's outer surface. Sketch the shear stress on volume elements located at A and $B.$