[问答题]
A person stands, handsz3 9 w xm0hn.h-l+auis at his siz.wt. 3el1l sray u5d8de, on a platform that is rotating at a rate of 1.3rev/s If he raises his1lzwyul.8re3.5 t a sd 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
