[问答题]
A person stands, han.qp*jq6y,- /i jr qflnds at his side, ondjqy)b8 ln6, hc.8vgc a platform that is rotating at a rate of 1.3rev/s If he rais8)y8dcbcjl 6 .hnqv ,ges his arms to a horizontal 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
