A torsion member with solid rectangular cross section is subjected to end torques T, as depicted in Fig. P4.10-3. Let the cross-sectional area of the torsion member be 5000 mm, and let T = 2.0 kN m, L = 2.0 m, and G = 25 GPa. (a) Determine the maximum shear stress in torsion members having the two width/thickness ratios d/t = 2.00 and d/t = 4.00, respectively, where d and t are defined in Fig. P4.10-3. (b) Determine the angle of twist for torsion members having these two d/t ratios.