[问答题]
A person stands, hands atgoucrz71 -jb5v b cd2(a -l:so his side, on a platform that is rotating at a ratejqim t m,mhr34hkf9)ga b0 :u1 of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the speed of 4h h9mm1:aujqfmi,g30 ) ktrbrotation 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
