! Required information Bearing reactions R1 and R2 are exerted on the shaft shown in the figure, which rotates at 950 rev/min and supports an 10-kip bending force. Use a 1095 HR steel. Specify a diameter d' using a design factor of nd= 1.6 for a life of 10 hr. The surfaces are machined. Assume kb = 0.85 and q = 0.85. F -10 in +5 in- d/5 R. 1.4d- d/10 R. 1 in- R d + What is the value of the moment at the critical section? F -10 in- 5 in- -5 in- d/5 R d/10 R. 14d- R 1 in The value of the moment at the critical section is kip-in.