[问答题]
A person stands, hands at his side, on a platform that is roaop(lw i+5a v8tag9 :*yq ;of v7)bqfqntting at a rate of 1.3rev/s If he raises his arms to a horizontal pos9f* t q)vgy7;:qo fqnbition, 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
