[问答题]
A person stands, hands at z e0mvfw k.20h*q;jcohis side, on a platform that 57bb1ic3vw tw1 d*ay cis rotating at a rate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48,i75 a3vb ct*w11bywcd 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
