[问答题]
A person stands, handn. f+ shb,w9b1s(szqss at his side, on a platform that is rotating at 2.ji z(w3ecj(-c mhg ba rate of 1.3rev/s If he ragmczj 3b(we( cj.hi2-ises 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
