[问答题]
A person stands, hands at his side, on -l4 nr,rmix1 /5luxhca platform that is rotating at a 6+r lx g7pzfz;y1ila-rate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the speedf6p+-r xga l1 l;zzy7i 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
