machine design

Q3. A certain application requires a ball bearing with the inner ring rotating, with a design life of 25kh at a speed of 350rev/min. The radial load is 2.5kN and an application factor of 1.2 is appropriate. The reliablify goal is 0.90 . Find the multiple of rating life required, x0, and the catalog rating C10 with which to enter a bearing table. Choose a 02 -series deep-groove ball bearing from Table 112, and estimate the retiability in use