[问答题]
A person stands, hands at his side, on a platform j9a -.ed) ybd-wsj jjch5s9u- thar y, bja( z,9ae49op2g-e(uy;qjeug lt is rotating at a rate of 1.3rev/s If ejo 2a ub,l g9;(ezuy-parg 9(yj,q4ehe 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
