[问答题]
A person stands, hands at his gn+b 3/dzq2:ffofp c(dd8 u-oside, on a platform that p-dj dq4o 2i 9szm54oris rotating at a rate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the sp 2s94oodp rdj5 -zm4iqeed 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
