[问答题]
A person stands, hands at his sid *yx21/,cggj(h dkbd ue, on a platform that is rotating at a rate of g(u2kgj h1 bd,dycx* /;g w.;nw6swnk4h q dz:1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the speed o nw zk;s4wwhng; .d:q6f 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
