[问答题]
A person stands, handf y7x n/3k(gtfs at his side, on a platfor we p99nn-.xqzm that is rotating at a rate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the spe 9wqen.p xn-9zed 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
