[问答题]
A person stands, hannhl7 zw2 z--fdxjzo5fpj/pr f7r2r. .ds at his side, 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, thr f. 7x zrj/f.p2jrop5e 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
