[问答题]
A person stands, hang.p*yqij 5u5 jds at his side, on a platform that is 3u lxl h-m1-kdrotating at a rate of 1.3rev/s If he raises his arms to a horizontal lmhdxk3u 1l--position, 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
