The solid shaft in is made from brass that has an allowable shear stress = 100 MPa and a shear modulus of elasticity G = 39 GPa. The length of the shaft is L = 2 m, and over the length of the shaft the allowable angle of twist is = 0.10 rad. If the shaft is subjected to a torque of T = 25 kNm, what is the required diameter of the shaft?