[问答题]
A person stands, hands at his side, on a platfo cqkfrqo: 9f5d2muu paz ;:9:phu(+gvrm that 6z 1qx6w 8gactis rotating at a rate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the speed of rotation decreactz68 g qxw61ases 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
