A piston slides downward with a constant velocity through a vertical pipe. The piston is 5.48 inches in diameter and 9.50 inches in length. An oil film between the piston and pipe wall resists the downward motion. If the film thickness is 0.002 in. and the cylinder weighs 0.5 pounds, estimate the velocity. (Assume the oil viscosity is 0.016 lb • sec/ft2 and the velocity distribution in the gap is linear.)
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