[问答题]
A person stands, hands at his side, on a platfo n2 jy ,(gwyjj(vzbo:+rm that is rota9fify ;kcm8qnn00 p,kting at a rate of 1.3rev/s If he raises his arms to a horizontal 8 f,kyq0 np;kc09mi fnposition, 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
