[问答题]
A person stands, hands at his side, onayzd6w dd2p 42 a platform that is rotating79 l07 exrqe/ly picc*)cr ll0 at a rate of 1.3rev/sy r7)lli7q lp0c/c 9cleer0x* 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
