[问答题]
A person stands, hands at his ;osh0 p4 bs5nsside, on a p1pl.hn7rg 6w5 c9wkwtlatform that is rotating at a rate of 1.3rev/s If he rw cr nhp g6w9t5.7l1wkaises 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
