[问答题]
A person stands, hands at his side, o k)fx /h* :0npcvu3kjbn a platform that is i:emuvn2o-m15d(hz a rotating at a rate of 1.3rev/s If he ezm(2o iu a:51n dvmh-raises 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
