7 Truong Dai Hoc Su ph4nr Tp.HCM . , : . . Khoa Vf,t Lf on rm uoiv QUANG ( L6p crJxnAN ) lql & Hqc kj,II Ndrn 2006_2007 ( DC thi Hn I) i Thdigian 120 phrit I. Lf thuv6t : cdu I i'rri'h bAy nOi dung Djnh ru0t Kir.chrroff .v'grrTa cta tlirilr ruft. Cffu 2 : Trinh bAy nguy€n tic ho4t dgng cta au.ng kl . II. Bii t6p: cfiu I : Cho rn6t flr6u ki'rr dAy chitit su6t N = I,5 hai mut r6i c6 brtur kinh len luqt re 20cm vd 80cm <t[t trong kh6ng khl Ba div d t6m cria th6u kinh ta zo; ;u;;;t'nh6 ^; ;rr;*;; g6c vdi t4rc chinh vd 6 tru6c rndt ciu thf nh6t 60 cm. ;"rJ;ij6ng thric mflt cau khric xs x6c dinh vi tri ,ti'n ch6t vd rlQ ph6ng tl4i cra a'h qua b'coi th6u ki'h dAy rtuong duong m$t qua'g h0 <Idng trrc .X6c tlinh 4 di6rn dac biet cria quallgh0.Ki6rrrhalaiki5tquricdua.V€lrirrlr. Cf ir 2 : Tia Rongheii c6 budc s6'g i:0,20g A0 bi tian x4 b6i Cacboii.H6y xr{c tljnli : a.Budc s6ng l.' cria tia Rcrnghen tfur xa dutii g6c 900 i brDdngrrEng ctrc dai c,.ia elccrlon. i Choh:6,6253.10-34Js,ms:9,1.10-3tKg,c=3.108m/s. ^t\, ; /i,rr\ t ev, 'q r.ru_nvs. #, I \ t, L -1L l0 - . ii ( Kh6ng fugc sri dung tdi ligu) .+. d . - " t\ {",{)f}.t;*'' ,', 1r', l' - ,r'-'u t t, , - ///T s t, *u,%b* D'2 ' . Su ph4nr Tp.HCM . , : . . Khoa Vf,t Lf on rm uoiv QUANG ( L6p crJxnAN ) lql & Hqc kj,II Ndrn 20 06 _20 07 ( DC thi Hn I) i Thdigian 120 phrit I. Lf thuv6t : cdu. elccrlon. i Choh:6, 625 3.1 0-3 4Js,ms:9,1.1 0-3 tKg,c=3.108m/s. ^t, ; /i,rr t ev, 'q r.ru_nvs. #, I t, L -1 L l0 - . ii ( Kh6ng fugc sri dung tdi ligu) .+. d . - " t {",{)f}.t;*'' ,',. " t {",{)f}.t;*'' ,', 1r', l' - ,r&apos ;-& apos;u t t, , - ///T s t, *u,%b* D&apos ;2 '