[问答题]
A person stands, hands at his2okfg7 v3 +uqzfqj)fdjq 7* *e 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, the speed of rotation d*qq fjjfe)7*d ecreases 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
