[问答题]
A person stands, hands at his sin8 n1jxr)ppoc bc9gzo6y*4jp,m9 j (xrh)w*ap,.viq de, on a platform that is rotating at a rate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, va hi),wpq.r* 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
