[问答题]
A person stands, hands at his side, on a platform that is rotzmcb1-6,o qwoatingmt nin x(6ck8. at a rate of 1.3rev/s If he raises his arms cikm.t (8xn 6nto 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
