m dao clQng di€u hda tai ncvi qd gra tdc roi t.u do toin phin m& con 6c don thgc hiEn duqc trong thdi... Tdc d5r truydS s6ng khdng phu thuoc.[r]
(1)so GrAo DUC VA EAO T4O rl{tl,q THTTN HUE ry rrtnn rnq Hec Ki r.- NA.M txec 20t4 -2:0tS MON : VAT LI - LOP 12 TIIPT Thdi gian ldm bdi : 45 pkfi{ Hs t6n hsc sinh : ., , 56 b6o danh : I yeFstl A PHAN CHUNG CHO TAT CA HgC S|NH fru c6u r dr$n ciu 24t Ciu 1: Hai dao dQng di6u hda thdnhphAn cung phuong" cung tAn s6, cirng plm c6 biOn d0 ld ,41 vd A2 vdi A.2 : 3A1 thi dao dQng t6ng hqp c6 bi6n dg A ld A,.2Ar B.3Ar c.4Ar D.Ar Ciu2; HiQn tugng 6ng hu&ng xey tAn sd cia A \rc cu&ng bric l6n hqn tan s0 ri6ag cira hQ B lgc cudng bric bing tAn si riOngaria hQ C lgc cu0ng bric nh6 hon tdn sd ri&rg cta hQ D dao dQng b6ng tfrn s6 ri6ng cua h8" Cflu 3: MQt v6t dao dgng diAu tida tr6n tryc Ox c6 dO thi li d0 theo thoi gian nhu hinh v6, tryc ftrng ld li d0 drrn vi la centimet, -tryc hoinh h thdi gian don vi ld gi6y Phuong kinh dao dQng cria vflt ld A.x:4cos(5t-f I fr*1 B C.x:4cos(lft*;){cm) D CSu 4: Co x= 4cos(10a't x: 4cos(5 "t - J t) 1cm) (cm) ning cira mQt lic ld xo ti lQ thuin vdi A tdn sO dao dQng C.li d0 dao d$ng B binh phuong bi€n dQ dao dQng D bi€n d0 dao d$ng CAu 5: MQt dAy ddn hdi AB hai dAu c6 dinh dai 50 cm, tdc dq truyOn s6ng tr6n ddy mls, tAn sO rung tr6n ddy 100 Hz Tfnh tt A, diOrn M cdch A m$t do4n 3,5 cm A nirt s6ng thu D bpg s6ng thir B bpnf s6ng thir C nut s6ng thri 8 7, li sau diy, trudrng trgp qt aan.nirantr ld c6 lqi ln CAu 6: Trong ntrirng OrJ e$ttg,6t A khung xe td sau qua ch6 dubmg x6c B qui ldc ddng h0 C 6c cton phdng thi D 6c 16 xo phdng thi nghiQm {h nghiSm Cfiu 7: MQt hc ngang 1S xo g6m quf, c&r c6 khdi lugng 100 g dao dQng tti6u hda theo phucrng vdi phucrng trir*r x:2cos(10m n 8.4 N A.200 N Cfru 8: Co ndng cua mQt dao dQng bi€n d0 dao ilQng giim 8.4,610A +) CAu 9: Mgt l6c dcrn c6 chi€u ddi 10 56 dao dgng 10 m/s2 LAy gian phtit ld g: n'* !0 EO lorl lgc k6o vA "uc dai ln D.2 N c.400 N Uit aan chAm gihmWo sau m5i chu kj, ;S*u m6i chu C.6,41%s D.2,25Yrsi I m dao clQng di€u hda tai ncvi qd gra tdc roi t.u toin phin m& 6c don thgc hiEn duqc thdi D 106 C 105 CAu 10: Trong dao dQng di6u hda, dai luqng kh6ng thay <16i vflt dao dQng ld tir.T;rXnli;O B t6n s5, bien dQ, co A gia ti5c, bi€n d0, tan A 160: B 150 s6 l2A-2- k! I tL.z,\lYo i : (cm) LAy "*t r* (2) c gia t6c, bi€n d0; co ning dao <l$ng D tAn s6, bi€n dg, hqp lgc tdc dung l6n vdt CAu I I: Chc.rn ph6t bi6u tlfng A Giao thoa s6ng nudc ld hiQn tugng xdy hai s6ng c6 cung tdn sd gap trdn rnlt tho6ng B Hai ngudn dao dQng c6 cung phuong, cung tAn si5 le hai ngu6n ktit hqp., C Noi ndo c6 song thi noi 6y c6 hipn tuqng giao thoa s6ng co cung phucmg cung tAn s5 va c6 dq lgch pha kh6ng d6i theo rhdi gian ld hai s6ng k6t hqp D.Ifi Ciu 12: Trong hQ s6ng drmg trOn mQt sgi ddy, khoing c6c giiia hai nirt s6ng li6n ti6p bing A mQt budc s6ng B hai lAn budc s6ng C nira buOc sOng D mQt pnf,n tu bu6c s6ng Ciu 13: Gia t6c tuc thoi dao dgng didu hda Ui6n d6i A l0ch rrha L so vdi li d6 B ctng pha vdi C lQch pha0,25n so vdi li dQ li tlg D nguoc pha v6i li dQ Cf,u 14: DQ cao cua Am li m6t d5c tinh.sinh li cua 6m phg thu6c vdo B t6c o6 truycn A tan s6 c biOn d0 D n6ng lugng am am a* dm Csu 15i Phuong trinh s6ng tai ngu6n O c6 d4ng ue : 4cos( l0 nt + |) t"*), v4n tdc truy6n song m6i truong ld m/s thi phucrng trinh song tai M cdch ngu6n O m$t do4n cm id B.uu:4cos(l0rr A uu 4cos(10 rrt ) (cm) C.ur,,,:4cos(10 Et-i) (cm) + 3f,) (cm) D.uM:4cos(l0at +f,) (cm) c6u t6: S6ng dimg xtry rc tr€n dAy den hdi AB : 11 cm v6i dAu A c6 dinh, dAu B t.u do, tAn s6 song tr€n ddy h 10IIz T6c tIO suyin s6ng tr€n ddy ld 40 cm/s vi kh6ng OOi Oe'rC" AaV c6 l0 nrit s6ng thi ta phii thay A6i tan si5 dao dQng bing c6ch A t[ng 72,7yo B ginm 17,27oA C t5ng 17,27oh D giim 72,7oA Ciu 17: Hai di6m A vd B c6ch 10 cm h€n m4t ch6t 16ng dao dQng rheo cirng phuong trinh : uA : uB = 2cos(1004t) (cm), voi t6c dg truyAn s6ng tr€n mdt nudc 100 cm/s, ifr"*g trinh s6ng cria di€m M o tr6n tlucng trung trgc cua AB crici hai ngu,5n A, B mQt dop d id A uu = 4cos(100 rt+ 2zd) (cm) B ul,a = 4cos(100 rt - n d) (cm) C uu:2cos(100 xt-rd) (cm) D try:4cos(200 nt-2zd) (cm) Cflu 18: S6ng truy€n h6n mQt sgr day dan hOi c6 mQt dAu c6 dinh, mgt dAu t.u Mudn c6 s6ng dirng tr€n ddy thi chi€u ddi cua sqi ddy phii bing mQt s6 A chaS l6n mQt phAn tu budc B nguy€n lAn bu6c s6ng C 16 ldn mQt phdn tu budc D le lan nria bu6c s6ng, CAu 19: d mat nudc c6 hai ngudn s6ng dao dQng theo phuong vudng g6c vdi m{t nudc, c6 ctng phuong trinh u = Acoscot Trong midn g{p cria hai s6ng, nht'ng di€m md d d6 c6c nfan tu nu6.c dao dQng vdi bi€n itQ cuc dai sC c6 hi€u <luong di cria s6ng tu hai ngu$n <t6n d6 s6ng s6ng beng mQt s6 A 16 len budc C le Hn ntra budc s6ng s6ng B nguyOn lAn ntra buOc s6ng D nguydn Hn buOc s6ng Ciu 20: MQt lic lo xo treo jhing dung Khi vflt dang & vi tri cin bang nguoi ta ndng vflt ld xo kh6ng bitin d4ng r6i flra nhe ttri vflt dao <tQig didu hda tneo itru"ong tfring Erirng quanh vi trl cAn beng O Khi vQt di qua vi tri c6 tga dg 2,5J, cm thi c6 vQn t6c 50 cm/s LAy l0 m/s2 Tinh tu iric thi vgt, ttrdi gian v$t di dugc qu6ng duong 27,5 cm ld lOn dA g: A 5,5 s B.5 s "'#' D.#, Trang}/4 - NAa OA fSe (3) cau2t:.Tai di6m o rong dalq.h1*tg1"kh6ng h6p thu dm, co ngu6n am diam, r:i^*Tq -ot6m gi6ng vdi c6ng su6t phdt 6m kh6ng a6i 16 e co mric cuong dO e;20 dt tti;i trung diem M ctia do4n oA c6 mtc cuong d0 dm h 30 dB til ;d ng;#iirlio;;" ;rill dm trdn cAn d[t th6m tai O ld A 10 B.8 c D.5 Ciu 2}:.Chqn cAu tri ldi dung vd s6ng co hgc A Tdc d5r truydS s6ng khdng phu thuoc vdo m6i trurlng truyCn s6ng B Vfn t6c truyAn s6ng phq tt*Q vdo tAn s6 cia s6ne Iirg.!"qng s6ng lu6n lu6n kh6ng d6i qu6 tinh truyan s6ng D Tdn s6 s6ng khdng d6i qu6 trinh truy6n s6ng cau 23: MQt l6c don c6 chu ki dao dQng voi bi6n d0 g6c nh6 I s dao ctQng tpi ncri c6 10 mlsz.Ldy n2 :10 Chi€u ddi cria dAyireo lic ia : A.2,5 cm 8.2,5 m C.0,25 cm D.0,25 m Ciu 24: MQt Am thoa dign c6 hai nhrlnh, dao dQng vdi tdn s6 SO FIz, ch4m m{t nu6c tpi hai M vi N c6ch 2l cm, tiic dQ truyAn ronftren m{t nu6c ld m/s Tr6n MN s5 eiem - ,di€m dao dgng vdi bi€n dQ cuc dai vd dao <tQng tung phi vdi ,J;a"la A 10 B 1r 20 D 2r di€m li g: - di6rn rti0m -i dic; B PHAN R|CNG : Hgc sinh chl duEc chgn I phin ri6ng sau d6 tim bii' I PHAN RENG THEO CHUONG TRINH GHUAN fT} CdU 25 d6N CiU 30] CAu 25: MQt do4n ryachg6m tti€n trd thuAn R, cugn day thuen cim c6 dO t.u cdm L, vd mQt qu c6 diQn dung C mdc n6i tiOp D[t vio hai itAu doan m4ch m6t hieu'dibn thti *ouy "irie,, u: u6cos(orQ D6 c6 hiQn ruqng cQng hucrng cliQn xay rrong m4ch thi As LCa2 =1 B R=! C LCa= C D.a:l R2 LC cf,u 26: Tren do4n.T4.1 xoay-chiAu kh6ng phdn nh6nh c6 btin di6m theo dring thri ru A, M, N vd B Gitra hai tfi6m A vd M chi c6 diQn tro thuAn, gifra hai cti€m M vi N chi c6 cu6n dgv gita di6m N vi B chi c6 r$ di0n Dit vdo hai dAi- ooa" m4ch mot dieri l75V - 50 Hz thi diQn hieu dsng hdn do4n AM h 25 V, tr6n do4n MN le zs v vd tr6n |P do4n NB h 175 V He s6 c6ng su6t ctia todn mach li: il;;:#; A.7 B 25 I c 25 D.24 t75 dung khdng c6 t6c dr;ng ldm cho 6p so v6i cudrng dQ ddng <tiQn tu! thu$c vdo gi6 tri Aie" dung C ciu27; Trong mach loay chi6u chi c6 diQn c thi A d0 lQch pha cria <tiQn B diQn 6p cung pha v6i ddng diQn C diEn 6p tr6 pha so voi ddng dign mQt 96" i, D diQn 6p nhanh pha hcrn dong rtiQn mQt g6c Cflu 28: Cho m4ch diQn kh6ng ph6n nh6nh RLC c6 R t = *r, 11 tu diQn c6 diQn dung C = thrlc i =J2 cos(10 0n +L 2t #pF : 100 C), cuQn ddy thuAn cim c6 Bi6u thric cudrng rlQ ddng diQn qua m4ch c6 bi6u ) (A) thi bi6u thric iliQn 6p hai diu m4ch ld Trang3/4 'Me dA 35E (4) u: 100cos(1007rt) (V) C u : 200cos(1 00nt) (V) A ' B u - 200cos(100rt +ll D u = 200cos(l00nr -i> wl fVl D?t dien 6p xoay chiOu u : Uscos( at * p) vdo hai dAu doan mAch gdm diqn tro & cuQn ddy thuAn c6m c6 d0 fu cim L vd t9 diQn c6 diQn dung C Cho ar bi6n thi€n cho LC.tt2 =t Ta k6t lu{n ring Cia 29: bi"g * vi bhg * A c6ng su6t ticu thu cua m4ch dat cuc dai vd B cdng su6t ti0u thu qua m4ch d4t csc d4i C cudrng d0 ddng ctiQn higu dgng qua mach d4t cgc d4i vd bing D t6ng tr& cria m4ch cr,rc d4i L R: 50 O, cu$n dAy thudn cim co he sO t.u .,l l(lutl 7r u uL vi bing diQn trd thuAn' CAu 30; Cho m4ch diQn kh6ng phdn nhanh RLC: ctm J- l>1t : 200cos(100nt +f I Cn thi bigu thirc cubrng dQ ddng diQn ch4y qua cfiQn ld A i -2J2 cos(i00nt + fi c i: 2J2 cos(1o0nt + il i:2J2 cos(loont -fr1Q+) tnl B <1ll D i = 2J2 cos(l00rTt) (A) il PHAN RIeNG THEO CHI/ONG TRINH NANG CAO rrir ciu 31 diin ciu 361 C6u 31: Trong mach dao d$ng, di€n tich cua t1r <liQn bi6n thi€n B v6i hdm sd mfi theo thdi gian A rheo ham UAc nn6t A5i u-Oi tftUi gi* c diAu hda vdi tan s6 soc 0)= + J rc' D diAu hda vcri tdn s6 g6c , = JTC Cfru 32: Chqn c6u khOng ihing S6ng diQn tri truyOn dugc B mgi m6i trudng chAt long A mgi m6i trucrng vdi tdc d0 3.108 D thdp C nudc mls ' Ciu 33: Mach diro dQng dign tu LC gdm mQt cuQn dAy c6 d0 t.u c?tm prH vd tu diQn c.6 diQn dung 2000 pF Di€n ticl cgc dpi tren 41 f3 S frQ Ni5u m4ch c6 eli€n trd thudn ld 0,1 Q, d0 tri dao ilQng m4ch m$t tuAn td tfri can phdi cung c6p cho m4ch mQt nlng luqng li D.94,5 MJ C.37,2M1 8.57,3 MJ A.48,6 MJ Cflu 34: MQt vflt rin quay ctOu quanh mQt tryc MQt <1i0m cria vit c6ch tryc quay mQt khoAng R thi c6 A gia t6c g6c ti lQ v6i R C tiic dO dei ff lQ voi R B tea dQ g6c ti lQ nghich voi R D gia tiSc g6c ti 19 nghich voi R Ctu 35: MSt rdng rgc hinh tru kh6i lugng kg, ban kinh R dung d6 kdo nudc mQt giiSng Chi6c xb khdi lugng kg buQc vdo sgi d0y quAn qurinh rdng rqc, n6u xd ttugc thi tu *ieng giting thi sau s xflch?m nhg vio m{t nudq 86 qua ma s6t vir m6men qudn tinh cua tay quay, 6y g = 9,8 m/s2 E0 s6u tt miQng gi6ng d6n mflt nudc ld D 52,92 m' C 25,7 m B 22,A5 m A 25 ,2 m Cflu 36: Bi6t m$men quan tinh cua mQt b6nh xe COi voi trpc ctra n6 ld 10 kg*t.BAnh xe quay xe ld (cho n' : l0) E$ng nane v6i t6c dQ g6c kh6ng d6i h 600 vdng/phtt 1a lanh D.2.101J c.3.104 J 8.2.104 J A 4.1031 Trang4l4 - Naa AA fSs (5)