[问答题]
A person stands, hands a n39 bp1 ag-r(wevtq(bt his side, on a8 6-p;aw(zglwt .-)k y up+9fnzi97ps d khwmp platform that is rotating at a rate of 1izuywwnpfp l zp s+) pm 7 (-kt.69d;wh8agk9-.3rev/s If he 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
