[问答题]
A person stands, hands at hxb,o hpzvclg ni4 2su.x08v* :is side, on a platform that is rotating at a yri cal y,htj59 *b/:zrate of 1.3rev/s If he raises his arms toi/ayr ybh9l5 z c:tj*, 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
