P7 (8 points): Four gears are attached to a circular shaft a distance of 6 m apart. Each gear transmits the torques shown in the figure. The allowable shear stress, Tallow, in the shaft is 12 MPa. The modulus of rigidity, G, is 70 MPa. a.) Determine the torque, T, in each segment of the shaft (TAB, TBC, TCD). b.) What value of T would you use to calculate the minimum diameter of the shaft? 14 N-m 30 N-m 6 N-m 6 6 0 0 A B C 10 N-m D Note: The distance from one gear to the next gear is 6 m.