[问答题]
A person stands, hands at h9h *b(bg80mp agir, :- u0elvps/ztnk is side, on a platform that is.sxl f://b8l9kqw v-1a,mfa y sw(pw s rotating at a rate of 1.3rev/s If he - wwy/s.f(9 qalxm,1w k8vsl bp:s/afraises 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
