[问答题]
A person stands, hands at his ptlhmn 12,kzmn+ /34l0aa3g es + oqnvside, on a pl2/ c -dsbp3xq.qwr 2hpatform that is rotating at a rate of 1.3rev/s If he rai dpbr2 - h2/c.q3pqsxwses 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
