[问答题]
A person stands, hands at his side, on a pl g8iamyb0gi z*ws y07q,hk0j+ atform that is rota1)zysy 2s ue0ctc ;g84f0twdating at a rate of 1.3rev/s If he raises his arms to a horizontal position, 80fd;tc2e)ztc ga1 y4ws syu0 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
