[问答题]
A person stands, hands atfock0; p3p 7a9t2dd o59thjqa his side, p)7hcr(blz ht orq.4 )on a platform that is rotating at a rate of 1.3re(rcp)r tl .b4qzho7 h)v/s 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
