[问答题]
A person stands, hands at his side, on a platform thaqdvdg l2elskm;3:4 k1vw+ 6 kbt is rotating at*s+c :5 n8v(jfnes u-jsyc. lm a rate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the speed of rotation decre.+fvlse*s8 jc( nc uj5ynm-:sases 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
