[问答题]
A person stands, han +mu3.7cim/om nr yes8 sj1cw;/,.gm gua ,jnrhs x,t1ds at his side, on a platform that is rotating at a rate of 1.3rev/s If he raises his arms to a horizontal position, n. mg,1gusjtx a,,/ rhFig. 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
