[问答题]
A person stands, handb+aqd2u z)y:83jeq37zs vtvhdgz30 rn)wi;zovf :bkds e- 0-s at his side, on a platform that is rotating at a rate of 1.3rev/s If he raises his arms to a horizontal zsodi:)0ezn v3- rd wk -g;fb0position, 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
