[问答题]
A person stands, hands at his side, on a platform th27 oufw6p 4o)4dqq dajat is rotatinjxo6 b8al.rw se mzo)+r :x2x)g at a rate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–)r xol8s+ xwrmx jeo62) b.a:z48, 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
