[问答题]
A person stands, hands yg.3/uho3kgjo;t8 vhat his side, on a platform that is rotat; r1zfzm;irlv7;ve *eing at a rate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the speed of rotation decreasez;e 1fl;; vmi v*erzr7s 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
