[问答题]
A person stands, hands at his side, on a platform thy8tw5 hj7ann +at is rot w,:d 4b )okexm ;4j:hiixlhm/ating at a rate of 1.3rev/s If he raisesxw)i:x /lkh o4:bjm h,; ie4md 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
