For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is

Question

Consider the following statements:

         For a journal rotating in a bearing under film lubrication conditions, the frictional resistance is                     

1. Proportional to the area of contact
2. Proportional to the viscosity
3. Proportional to the speed of rotation
4. Independent of the pressure

Which of these statements are correct?

         (a) 1,2,3 and 4                (b) 1 and 4 only

      (c) 10 x (60)^1/3mm           (d) 10 x (20)^1/3mm