[问答题]
A person stands, hands +(/idpxxc l q.at hiso n vb + 3x8gf+0govvg5-mffs) side, on a platform that is rotating at a rate of 1.3rev/gvff5 +b+g onmos gxf83 -vv)0s 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
