[问答题]
A person stands, hansn4 w8 0z*x;: hewfs 5uahz wew39ew/ud 3hp0i1ys,g+1m bd, e8kkmp pys at his side, on a platform that is rotating at a rate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the speed of rotation decreases tsi ,h1kb0 ppd3p +g1y,ym8kme o 0.8 $rev/s$ (a) Why? (b) By what factor has his moment of inertia changed?
Post time 2025-2-18 20:00:22
