[问答题]
A person stands, hands at his side, on otoa4a(*l: 0ciuum y (a platform that is rotating at a ratm r9*v0ya-7rzlrx/5e+ zwd2vp ,vu kke of 1.3rev/s If he rae zk v2rzlma5v-9v 7u*+ d/rpyk,0rwx ises 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
