[问答题]
A person stands, hands at hisf u ;-.ll9a1bc7r 5mf(uhg +d kigy.gm side, on a platform thae u z*y7sb8 8fo;ooea.3w rt(ft is rotating at a rate of 1.3rev/s If he raisw s.8 ( e8zrfo;oub7 f3tyaeo*es 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
