2.15: (a) A thin circular member, AB, lying in the x-y plane, as shown in Fig. (2P.15a), is subjected to a force Px and a moment M. Determine the resulting internal forces at any cross section in terms of R and 8. (b) If the circular member is subjected to a bending moment Mo and a torsional moment To as in Fig. (2P.15b), what is the resulting reaction force at point B? Mo (a) MA Px B Figure 2P.15 RO (b) A To