[问答题]
A person stands, hands at his side, on a pl .qyekenvv2 9+atform that is rotating at a ;.w gpnkyef1 c;rw/sd-:c m 3prate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the speed of rotation decrea;-c3:. nrfsym cw1ppg;ew kd /ses 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
