ch case

$9-41.$ The steel pipe has an inner diameter of $2\mathrm{.}75$ in$.$ and an outer diameter of $3$ in $.$ If it is fixed at $C$ and subjected to the horizontal $60-$lb force acting on the handle of the pipe wrench at its end, determine the principal stresses in the pipe at point $B,$ which is located on the outer surface of the pipe.