(20 pts) A thin-walled, prismatic beam made of an isotropic material is shown below. It is loaded by a known applied torque T. N L Side View T a 2t- 2a Cross-section (magnified) 2t (a) Find the torsion constant J. (b) Find the location and value of the maximum stress (in terms of given parameters). (c) As a designer, suggest a way that the mass of the structure could be reduced without sacrificing structural integrity to twisting.