Problem #2 A uniform, thin-walled, cantilever beam of closed rectangular cross-section has the dimensions shown below. The shear modulus G is uniform and equal to 20,000 N/mm. The beam is subjected to a uniformly distributed torque of 20 N.m/mm along its length. Calculate the maximum shear stress according to Bredt-Batho theory of torsion. (5 pts) 20 N.m/mm 1 mm 1000 mm Z 100 mm Thickness is uniform at 1 mm 1 mm 1 mm 1 mm 500 mm