Suppose that the cross section of a steel tube is circular instead of the shape shown but has the…

Suppose that the cross section of a steel tube is circular
instead of the shape shown but has the same wall thickness and circumferential
length. If it is subjected to an axial torque T = 2 kN_m, what is
the average shear stress in the tube? Compare your answer to the answer to
Problem 4.88.

Problem 4.88

A steel tube has the cross section shown. If it is subjected
to an axial torque T = 2 kN_m, what is the magnitude of the
average shear stress in the tube?