t h i cifdng dong dien h i e u dung t r o n g mach k h i co = co i b a n g cifcfng dong d i e n h i e u dung t r o n g mach k h i o) = CO2 He thufc d i i n g 1^: A.a>,a>,=-^ C 00,0)2 ~ B CO, + C T = LC LC Giai U Cudng dong d i e n hieu dung t r o n g mach: I = — De h a i dong d i e n bSng ufng v6i h a i t a n so coi, CO2 t h i : Z, = Z2 R ' + Lo), - - Leo, - Ceo Loo, Ceo Leo, y Ceo Ceo 2J \2 2J X e t h a i trUcfng hcrp: Leo, - - r — - = Leo, — < » Ceo, Ceo, eO|eo2 = Leo, - • Ceo, eo,eD2 = • Vdy chgn dap an CcOj -Leo, LC (loai v i eo > 0) LC C Cdu 4: T r e n m o t sgri day dan h o i d a i 1,8 m , h a i dau co d i n h , dang co s6ng ditog vdi bung song B i e t song t r u y e n t r e n day co t a n so lOOHz Toe d6 t r u y e n s6ng t r e n day 1^: A 20 m/s B 600 m/s C 60 m/s D 10 m/s GiSi Scfi day difcfc co d i n h h a i dau, dang co song difng v d i b u n g song t h i CO m u i s6ng M o t m i i i song l a khoang cdch giffa n u t co chieu dai — Ta co: L = - = 3?i = 1,8m :ii> = 0,6m V a n toe t r u y e n song: v = >uf = 0,6.100 = 60m/s Vay chon Giai Chi tiSt dap an C thi T S D H , C D M n V $ t li ' 29