[问答题]
A person stands, hands at hfq t-rxzhwxq5qbh/ 73 :y53zi is side, on a platfor)o - lx5l)-d,:/aq0avv jrpkjo, dsi qm that is rotating at a rate of 1.3rev/s If h )qo- a0sr-k,,pliaxvojj:d5)dv/qle 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
