[问答题]
A person stands, hands at his side, on a platform that is rotatin8)8 cgr/td )e1 i pfi+gzz ico08iqp-eg at a r2ojg w;s0vfye qgsmpa. ;9nxk09xp06nz ; j.aate of 1.3rev/s If he raises his arms to a horizontal position, Fig. 8–48, the speed of6j00ex;p;k ogy mnv 9a;0xj2a.snf q9psgz.w 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
