Two parallel plates are spaced 0.09 in. apart, and motor oil (SAE-30) with a temperature of 100°F fl ows at a rate of 0.009 cfs per foot of width between the plates. What is the pressure gradient in...

Two parallel plates are spaced 0.09 in. apart, and motor oil (SAE-30) with a temperature of 100°F fl ows at a rate of 0.009 cfs per foot of width between the plates. What is the pressure gradient in the direction of fl ow if the plates are inclined at 60° with the horizontal and if the fl ow is downward between the plates?