This problem involves a cylinder falling inside a pipe that is $5$lled 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 with weight w; diameter d$,$ and length esliding 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 ofdescent ofa cylinder $100$ mm in diameter that slides inside a $100\mathrm{.}5$ mm pipe. The cylinder is $200$ mm long Uld weighs $15$ N$.$ The lubricant is SA$.$E $20$W oil at $10\backslash$deg C$.$