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Problem 7.17 in our textbook is about a cylinder
(diameter=5 mi) used as a space colony. The authors
ask: "What angular speed must such a cylinder have
so that the centripetal acceleration at its surface equals
Earth's gravity?" The expected answer, w=0.05 rad/s,
follows directly from w^2*r=9.8 (this is about 0.5 rpm).