[问答题]
A person stands, hands at his side, on a platform k/yexu)k11hx that is rotaqxai l:yc* s b)p+p5f 6 dqd/1vkq+fd0ting at a rate of 1.3rev/s If he raises his arms to a horizontal :0i+ y c 6*qffd5dsq)kx p+bdvq1p/al 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
