# This problem involves a cylinder falling inside a pipe that is 5lled with oil, as

**Chapter 2, Problem 2.37**

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This problem involves a cylinder falling inside a pipe that is 5lled with oil, as depicted in the figure. The small space between :he cylinder and the pipe is lubricated with an oil film that has -lSCosity IJ.. Derive a formula for the steady rate of descent of a ~ylinder with weight w; diameter d, and length e sliding inside a .certical smooth pipe that has inside diameter D. Assume that the cYlinder is concentric with the pipe as it falls. Use the general "Ormula to find the rate of descent of a cylinder 100 mm in diameter that slides inside a 100.5 mm pipe. The cylinder is 200 mm long Uld weighs 15 N. The lubricant is SA.E 20W oil at 10C.

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