[问答题]
A person stands, hands at his side, on a p gw 8e8;dqdj;nj 9zoz0latform that is rotating at a rate ofwxfee/ 8/d-iy 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the -8yw/id/x f eespeed 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
