Beer & Johnston — Principal Stresses Under a Given Loading: Problem 8.22

8.22 Assuming that the magnitudes of the forces applied to disks A and C are, respectively, \(P_1 = 1080 \text{ lb}\) and \(P_2 = 810 \text{ lb}\), and using the expressions given in Prob. 8.21, determine the values of \(\tau_H\) and \(\tau_K\) in a section (a) just to the left of \(B\), (b) just to the left of \(C\).