[问答题]
A person stands, hands at his side, on a platform/i3ta (p) dbbh that 2yexpmw/b40i m-wiwqsh5p 58is rotating at a rate of 1.3rei0e / sqb4p8 whxw55ymiwm-2pv/s If he raises 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
