A solid cube measuring 0.5 ft per side and having a mass of 10 lbm slides down a smooth surface which is inclined 2? from the horizontal. The block slides on a film of SAE 30 oil at 60?F. Neglect air resistance.
(a) If the terminal velocity of the block is 0.2 ft/s, what is the film thickness in inches?
(b) If the oil is replaced by water and the film thickness is retained the same, what is the new velocity ?