[问答题]
A person stands, hands at his side, on a platfowuuitw+f. 7k5rm that i(yt(n:7mv ffpm8z ,gns w/jc,s rotating at a rate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the speed ofnv(:j( g cfyzmpf st wmn/,,87 rotation decreases to 0.8 $rev/s$ (a) Why? (b) By what factor has his moment of inertia changed?
Post time 2025-2-18 20:00:22
