[问答题]
A person stands, hands at his side, on hv28 ci)7u/ynsq c3jp a platf:hk6l, vvi -2o) rptdeorm that is rotating at a rate of 1.3rev/s If he raises his arms to a hor)e2l:hr-pivvd ,kot 6izontal 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
