[问答题]
A person stands, hands at his side, on a p bba5rupln 2hpm),7a(l8pkyx2jv. or+ atform that is rotating at a rate of 1.3rev/s If he raises his arms to a horizontal position2+xo.pyrkv 8 j, 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
