[问答题]
A person stands, hands z;5s.kx)ot o*m ;r j4 l e pbuf0ku0sxyu/b).vat his side, on a platform thk kq cr6/*hme(6bl w4kat is rotating at a rate of 1.3rev/s If he rais m46 wqek(b/lkr6k*hces 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
