[问答题]
A person stands, hand-7h2b r)an dhws at his side, on a l9; p 0cun.xv jzhlen)y- *1aiplatform that is rotating at a rate of 1.3rev/s If he raises his arms to a horizontal phu vp-i.nlc)n0 z*1e9;axy ljosition, Fig. 8–48, the speed of 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
