so clio DUc yA DAg rAo THIIA THIEN HUE rP rnr cHeN Hec SINH cror riNn rH6l 12 THPT - NAU Hec zan - zot2 Mdn : V{,T Li Thdi gian ldm bdi : 180 phrit oE rnr cnlnx rn0c Bnil:(4diAd Thanh s8t Oa cO L*r6i luqng r1r - Zkg, etAu O duo. c gfn vdo brlc tudng thAng dung nhd mQt ben 16, $Au A cria thanh sit treo v$t B c6 kh6i luqng mzJZtcg-va dugc git cdn b[ng nhd ddy AC nim ngang (dAu ddy C dugc cQt ch4t vdo tudng), ldti d6 g6c nghi0ng cria thanh get s9 vdi bric fiqg h a= 450.H6y xdc tlinh c6c lpc t6c dung l€n thanh sat. t6y g: l0 m/s'. Bii2:(4di€m) M$t mol l<tri ly tuOng thUc hi$n mQt chu trinh 1-2-3'4't, dugc bi6u di6n tr6n hQ tqa d0 p-V nhu tr6n hinh v€. Trong d6, c6c qu6 trinh 1-2 vi 3-4 cluqc bidu di6n b&i c6c cloan th[ng c6 duomg kdo ddi qua gi5c tga dO O; cdn c6c quf trinh 1-4 vit2'3 D d6ng nhiet. Hay bi6i di6n chu hinh et6 tren he tqa d0 V-T vd tim th6 tfch vr khi bift V1 vi V2. 'Bni3 t (3 di6m) Cho ss d0 mach etign nhu hinh v€. gi6t Er = 9 V. Khi thay eOi nieu dign th6 cria E* ta dugc hai gi6 tri ddng di6n h = )0 mA vd 12: 35 mA. Db thi h duong etpc nmg v6n - ampe crla b6ng ddn. Tim gi6 tri ddng tliQn I khi tl0n dotui m4ch. Bni4:Qdidm) cho hQ quang hgc hoan toen d6i xrlng: o gita ld ling kinh tam gi6c dou, hai Uen ta hai th6u ryinh h6j tU Lr vi L2 crlng c6 ti6u cu f : 30 cm. Trudc Lr ld ngu6n dcn sic S, nim tr€n ti€u di$n cria Lt, c6ch trUc ch(nh mOt khodng y: 14,3 cm. Tim chii5t su6t c,ia ldng klnh' ffi ':':ft"trintr v€. Ld xo c6 d0 cr?ns k, ssi ddv nhe, khong gimn' 86 qua ktr5i tuqrig cta rdng rgc vi mgi ma sdt. Tim chu lcj dao dqng cta vflt m2. Bli6t(3diiim) HEy tinh bdy mpt phuong 6n thi nghigp d6 x6c qi"h $iet loqg t6a ra khi mOt v0t truqt *u6ng ttt." *+fphine nghicig lftong co t5c d0 ban dAu. Bi6t gia t6c treng tru&ng noi ldm thi *ghiem. h e. Dung qi , iurAt it ine tiehiene ; v$t trust da bi6t ffi5i tusmg ; thudc eto d0 ddi ; dbng hO do thdi gian. , El f I(nn) lr 6- ".L {#::W. :'lal L1 V1 V2=V4 V3 . 6n thi nghigp d6 x6c qi"h $iet loqg t6a ra khi mOt v0t truqt *u6ng ttt." *+fphine nghicig lftong co t5c d0 ban dAu. Bi6t gia t6c treng tru&ng noi ldm thi *ghiem so clio DUc yA DAg rAo THIIA THIEN HUE rP rnr cHeN Hec SINH cror riNn rH6l 12 THPT - NAU Hec zan - zot2 Mdn : V{,T. nieu dign th6 cria E* ta dugc hai gi6 tri ddng di6n h = )0 mA vd 12: 35 mA. Db thi h duong etpc nmg v6n - ampe crla b6ng ddn. Tim gi6 tri ddng tliQn I khi tl0n dotui