[问答题]
A person stands, hands aqv.j6 y4x8vw ot his side, on a platform that is rotating at a rbxhi /utr +c39ate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the speed of rotation xcu 3b9t+rh/i 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
