[问答题]
A person stands, hands at his side, on a platform that7y v-,m4 egipg +0d clbpnbb9* is rotating at a n2n3*r*kta3 pi; r gmmrate of 1.3rev/s If he3m*n rmpr32akgnt* i ; 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
