The rotating shaft in the figure below is loaded by transverse forces 5 kN and 10 kN that cause reaction forces R, and R at the two bearings situated at the two ends of the shaft. Point A is a shaft shoulder required for bearing positioning, and a similar shoulder is present at the right bearing. The grinding relief groove at Point B has a radius of 5 mm and is 2.5 mm deep. The shaft surfaces are ground but the groove is machined. The shaft material is AISI 4340 steel quenched and tempered at 4250 C (material properties, Sy 1360 MPa (198 Kpsi) and Sut = 1470 MPa (213 Kpsi). All = dimensions are in mm. 5 kN 10 kN -100- -150- -1.5 R. -1.5 R. 30 D. 30 D. 50 D. -150- -150- R R [a]. Determine the factor of safety corresponding to a life of 250,000 revolutions of the shaft, for a reliability of 99.9999%. [b]. Does it make sense to neglect transverse shear stresses in this problem? Explain your answer. -40 D. 5 R. B 25