An outer hub rotates around a stationary shaft, supported by two tapered roller bearings asshown in Fig. 1123. The device is to operate at 250 rev/min, 8 hours per day, 5 days per week,for 5 years, before bearing replacement is necessary. A reliability of 90 percent on each bearingis acceptable. A free body analysis determines the radial force carried by the upper bearingto be 12 kN and the radial force at the lower bearing to be 25 kN. In addition, the outer hubapplies a downward force of 5 kN. Assuming bearings are available from manufacturer 1 inTable 116 with K 5 1.5, find the required radial rating for each bearing. Assume an applicationfactor of 1.2.

BJT Amplifiers ▯ 1 ▯= = ▯ 26 ▯ = = 2.6Ω ▯ = ▯= 100Ω ▯ ▯ ▯▯▯ = − ( ∥ ) ▯ ▯ ▯ ▯ ▯ ▯▯ = ▯▯ ▯▯ + ▯▯ = ∥ = 722Ω ▯▯ ▯▯ ▯