[问答题]
A person stands, hanfrdj5 j)mwujtj* ; 9f,ds at f ek8id f0yqz siepsaw3),543his side, on a platform that is rotating at a rate of 1.3rev/s If h4ys3i8ke,a 5d3qpi) f0w sfzee raises 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
