sc crAo DVC - BA0 TAo E{A Nsx TRrtdNG rni,r cnuynru rocuvnm mun sxxr rsrl sAE HSC rArq smu"r - roAira eolr nqow v4T tf Tladi gian ldpn bdi: 9& pte*t; (6& c&te tdc nghiQn*) 8* *** + * *** 8* *** **** ***8+ tr* M6 {16 rhi 132 +&+++++++++ x. pHAl\ CHIrI{G cmo rAr cA cAc rnf smru ( 4s cf;u rir edu x d6n c6u 4s} C[u 1: Tri khdng khf nguoi ta chidu xiOn tdi m[t nudc nim ngang m6t chirm tia s6ng hep song song g6m hai 5nh sing don s[c: mdu vdng, mdu lam. Khi d6 chimiia khric xa A. gdm hai chum tia s6ng hep ld,chirm miu vdng vi chirm miu lam, trong d6 g6c khirc xa cria chim mdu vdng lon hsn g6c khric x4 cira chim mdu lam. B. g6rn hai chim tia sdng hgp li chirm miu vdng vdL chtm miu lam, trong d6 goc khric xa cua chtm mdu vAng nh6 hon g6c khric xa cha chirm mdu lani. , C. chi ld chtm tia mdu vAng con chilm tia mdu lam biphin xa toin phin. D. v6n chi lA mdt chirm tia s6ng hep song song. Ciu 2: Det hiqu di6n thii u = UscoSc)t (Us vi r,r kh6ng eOl; vao hai dAu doan mach RLC kh6ng phAn nh6nh. Bi€t dign dung c6 th6 khdng COi. pi6u chinh tri sli di6n trd di6n dung C AC nieu di6n th6 hi6u dung d hai dAu cu6n dAy dai cuc dpi, khi dd h6 s6 c6ng sudt.iru doan mach b[ng : d-1 "' J' A.0,5. D"1 E" 0,85. CAu 3: MQt m6y ph6t didn 3 pha, c6c cudn d6y cira mriy ph6t mdc hinh sao c6 hi6u di€n th6 pha 121V vdtAn sd 50H2. Nguoi ta dua ddng ba pha vdLo 3 tii nhu nhau mlc hinh tam gi6c, mdi tdi c6 di0n trd thuAn 100 ( ) vi cu6n dey dQ tu cim 0,3 I BH. Cuong dd ddng di$n di qua c6c t6i vi c6ng su6t do citc titi ti0u thu c6 thti nhAn gi6 tri nio trong c6c gid' tri sau? A"i= 1,56A;F=242W B.l= i,56A;P =126W C.i= 1,8A;F=578W B"l=0,9 A;P=243W CGu 4: M$t m4ch dao dQng diOn tir gdm mQt t.u diQn c6 diQn dung 0,125 pF vd mgt cu6n c6m c6 d0 rU cAm 50 pLIJ. DiQn ti"d thu0n cira mach kh6ng ddng k6. Hieu diQn th6 cuc riai giria irai bdn tu di6n le 0,3 V. Cuong dQ ddng dr€n hiqu dung trong mach ld : A.0,i5 A. B. ls {mA) C" 7,5" 6(,{) 8.7,5\5(rnA) (;ciEi 5: Ccn I5e do'n co ehi€u d}ri ci-$y';reo ia t , kh6i luqng v6t n6ng 1d irr, dao ddne di6u h*a veli'oien ,i0 fl00 o,0 O noi c6 gia tdc trong trudng g. Tai vi tri con lac cd li dQ g6c o thi li d6 ddi ld s. Chon gde th6 nbng o'vi tri cAn bing. Di0u ndo sau dAy khdng dring? ts. Ed ldn lue kdo v6 la D. Bi6n d6 g6c as < 100. A. Thtiri[ng dao d6ng li !^secj. '2u c. rAn s6 dao dgng la +"/q 2n\ ( lsl iFl: mg! rr "( Cfiu 6: Trong thi nghigm Young vd giao thoa 6nh s6ng, bi6t a: 0,8mm, D{,2m, ngudn.S ph6t ra ddng thoi hai bric xp clo'n sic )'.1=0,4pm, 1,2=0,6pm. Khoing crlch gifia ba vdn s6ng li0n ti6p c6 mdu gi6ng mdu vdn sdng chfnh gifia ld: A. l,8mm B.3,6mm C. 5,4 mm S" 4,5mm Ciu 7: MQt he gdm 2 ld xo L., L^ co d0 cung k. : 60N/m, k^ : 1',2 1',2 40N/m nlOt ddu gin c6 dinh, ddu con l4i gin vdo vat rn c6 thd dao d$ng di6u hoi theo phuong ngang nhu hinh v6. Khi o tr?ng thdi cdn bane ld xo L. bi ndn 2cm. LUc ddn h6i t6c dpng vdo m khi vdt o vi ki lo xo L1 gilnlcm li: A. 1,0N . 8.3 N. C.2 N. D.4N. Cflu 8: Chuy6n d6ng cria mot vat ld t6ng ho'p cria hai dao ddng diAu hda cung phuong. Hai dao dong ndy c6 phuong trinh lAn luo-t li x, : 4.cos(10t + f,Xcm) ua xr : 3.cos(10, - t;1",r,) . D6 l6n v4n t6c cua vdt d vi 4' tri clin blng ld : A. 80 cm/s. Cffu 9: Ph6t bi6u ndLo sai khi n6i v6 s6ng di0n fu? A. S6ng di6n fu dung trong th.6ng tin v6 tuy6n goi ld s6ng v6 tuy6n, B. S6ng diQn tu ld su lan truyCn trong kh6ng giin cria die; tir truong bii5n thi6n theo thoi gian. c. Trong s6ng di6n tu, di6n truong vd tri truong lu6n dao d6ng l€ch pha nhau 1 '2 D. Trong s6ng didn fu, di6n trucrng vd trr truong bi6n thi6n theo thoi gian v6i cilng chu ki. C6u trO: Trong thi nghi6m Y-Ang ve giao thoa 6nh sdng, nguon srlng ph6t d6ng thd'i hai buc xa don s5c, trong d6 bric x4 mdu dd c6 buoc s6ng 720nm vd birc xa mdu.luc c6 budc sOng l, (cO gi"rl tri trong kliodng to A,iOOp*?C" 0,575pm)' Tr€n mdn quan sdt, gifta hai v6n s6ng gAn nhau nhdt vd .trng *eu v6i vani6ng trung tdm c6 g v6n s6ng mdu luc. Gi6 tri cira ]" ld : A" S,500 pm. 8.0,520 prm. C. S,540 pm, D. CI,560 pm. B. 50 cm/s. 8"4 C. 10 cm/s. c.6 D. 100 cir/s. T-r < {EE-n6} ts" casq:0,69 CAu 11: Trong thi nghidm l6ng vA giao.thoa vdi rlnh sSng tring c6 bu6c s6ng trong khoing tu l,:0,75pm d6n )", : 0,38pm. Kho6ng c6ch tu hai khe d6n mdn ld2m, khoing c6ch gifra hai khe sang ta Z*m. SO Lu, "+ bi tit tai M c6ch vin s6ng trung t6m 4mm ld: 4.7 Ciu 12: Cho mach di6n nhu hinh v0 (H.ld). Hi6u di6n th6 hai dAu doan.mach: uas : 200 J2 cos100rt (V). Cd.c v6n k6 c6 di6n trd rit ldn. V6n kti V, chi 100V, vr.ti 150V. H6 sd cdng suAt cua mach AB ld : .4. cosrp : A,25 B. cosq : 0,50 C. cosrp : 0,55 C6u 13: Tia tu ngoai duoc dirng A" d€ tim v6t nut trdn bC mit s6,n phAm bing kim ioai. E" trong y t(5de chup di6n, chieu dien. - ,; , " . .: (-" de chup anh b€ mar T'r6i Dar ffi v6 tinh. I-}. de trm khuy€t tiit b€n trong san phiim bang krm loar. ( * -,\ cau 14: cho mdt s6ng ngang c6 phucrng rrinh s6ng ld u : scosnl ^: -: l(**l . Trong d6 x tinh (0,r 2)' i tinh bing gidy, vi tri cria phin tu s6ng M c6ch g6c roa dQ 3 m 0 ttio.i aicm r:2s ld Ciu 17: Chon c6u tri ldi sai. A. Anh s6ng dcrn sic kh6ng bi t6n sic khi qua i[ng kinh. B. Trong hi€n fua"ng tdn sic 6nh s6ng cria 6nh sring tring, tia tfm c6 g6c l6ch nh6 nh6t. C. Trong hiQn tuqng t6n sic 6nh srlng oia inhsring tring, tia d6 c6 g-6c lgch nh6 nl1[1. blng cm, t A" 0 mm. 8.0,5 cm. C.3,8 mm. D.5 cm. cdu 15: chqn ph6t bi6u dring. co nlng cua m6t vat dao d6ng di6u hda A. tlng gdp d6i.kli bi6n d0 dao dgng cria vdt tlng g6p d6i. B. bi6n thi€n tuAn hodn theo thdi gian vdi cilu t j'.b;,rg chu lc}, dao dQng cria v6t. C" bing ddng nlng cira vAt khi v6t tdi vi tri cdn iling." J -Y-'D s. bi6n thi6n tu6n hodn theo thoi gian vdi chu lcj'bing m6t nua chu kj'dao dQng cua vdt. C6u X6: Dbt hi6u dign thii u = 100.Ecos100nt(V)vdo hai dAu doan mpch RLC kh6ng phAn nh6nh v6i C, R co da lo'n kherng eoi va I = 1(F{), Khi d6 hi6u di0n th6 hieu dung d hai d6u m6l ptrAn hi R, L vi c co d6 lun nhu TL nhau" C6ng su6t ti6u thu cira doan mach ld : c.350 w. ,d.250 w. B. 100 w. D.200 w. . S. Nguydn nh6n t6n sfc li do chi6t su6t cria mQt mdi truong trong su6t AOi vCi cfrc anhs6ng don s[c c6 mdu sic kh6c nhau ld kh6c nhau. CSu 18: 0 bC mat m6t ch6t 16ng c6 hai ngu0n ph6t s6ng t6t trqp 51 vdi 52 c6ch nhau 20 cm. Hai ngu6n niy dao dQng theo phuong thing dfng c6 phuong trinh lAn luq'i la ur =4.cos( }Tftnl;1mm) r,d 4" !,r, :4.cos G}lfi flt**). foc dQ truyAn s6ng tr6n m(t ch6,t16ng ld 80 cm/s. S6 eiem dao d6ng v6i bi6n 4 dQ cgc d4i tr6n do4n thing SrSz ld' i A.9. no .[!, O. c. ll. D. 10. Cdu tr9: C6c buc xa c6 bud'c s6ng trong khoing tu 3.10-em d6n 3.10-7m thudc wng birc xa ndo ? A" tia tu ngoai, B" tia Ronghen. C" 6nh s6ng nhin th6y. F" tia hdng ngoai. C6u 20: Cho m4ch di6n xoay chidu R-,L:m$r n6i ti6p, cudn dAy thuAn cAm dQ f.u cdm n = 0,318H, R:l00CI mic . -,:. vdo hai diu doan mach hi6u di6n th6 u :400costSOm1v; . Xdc dinh cuimg dd ddng di6n hi6u dung trong doan mach. A. i = 6(4). C6u 2x: MQt m6y ph6t di6n xoay chiAu c5 4 cFry cuc thi roto ph6i quay vdi v4n tiic bing bao nhi6u d6 dd,ng di0n n6 phdt ra c6 tdn sd 50Hz? A. n= 1500 vong /phrit. B" n: 500 vdng /phrit. C" n: 750 vong /phrit. *" n: 600 r'ong /phiit. thw 22:EEt vdo hai dAu ru di6n c6 diQn dung C: 10-o (F) dien 6p xoay chi6u 6n dinh. Khi di6n 6p tuc tho,r n trong mach ld l50V thi cucrng dQ ddng di6n tric tiroi trong mach li 1,2A. Khi di6n 6p tuc thoi trong rnach ld 4OJmry) thi cuong dQ dong diOn tric thoi trong mach ld ^tZtqA>. TAn sii ciia cldng xoay chiAu tilr vio hai dAu doqn mach lA : ,4. f : 4.0H2; ts. f :60H2; c. f :50H2; D" f :100F{z; B" I:3,26 (A). t.I: 2*.'E (,q) D" r:3(A). CAu 23: Con iie don c6 chi6u ddi dAy h'eo ld I : 1m , khdi,loqttg v6t nlng ld m, dao ddng diAu hoa vdi bi6n ei6 g6c us-90, 6 no'i c6 gia t6c tuong truo'ng g :.10in/s2. Ction g6c thd n[ng o' r,r tri cdn bang. Van tOr ei;a v6t khl con {,bc di qua vi tri ddy treo hqp v6i phuo'ng thing dring g6c 60 lA : S. 0"37 ri/s. l. C,14 ;n's. D .2i,2 '*ls" CAu 24: Khi n6i vA dao ddng cudng br?c trong giai doan 6n dinh, phdt bi€u ndo sau dAy ld dtng? A. Dao dQng cira con lic d6ng h6 ld dao dQng cuOng b'3c. B" Dao dQng eudng birc c6 tin sd nh6 han tin s6 cria lue cudng brlc. C. Bi6n d6 cria dao dgng cu0ng birc lA bi6n dd c{ra luc cudng bric. D. Dao d$ng cudng buc c6 bi6n d$ kh6ng AOi va c6 tAn s6 Uing tAn s6 cira iuc cu$ng birc. CAu 25: EEt dign 6p xoay chiAu c6 gi6frhigu dpng U:301D(V) vio hai dAu doan mach xoay chiAu RLC ndi titip. Bi6t cu$n ddy thuin cdm c6 d0 t.u cim thay d6i dugc. Thay d6i dg tir cAm L cuacuQn ddy ta th6y kni diqn rip hiOu dung hai diu cuQn ddy dat gi{ tri cuc dai thi diQn 6p higu dpng hai b6n f.u diQn ld U,: 30V. Gi6lri diqn 6p cuc dpi d hai ddu cudn ddy n6i tr€n b[ng ,dr. 30V B. 60 V. c. 100v. D. 60sv CAu 26: M6t m4ch diqn xoay chidu R1L1Cl khdng phdn nh6nh c6 tAn s6 cgng huong oi:50 (rad/s) vd mpch di6n xoay ehidu Rztzcz krhdng phdn nhrlnh od tin s5 cQng huong r.,:2, bi6t rD1 : 0)2 . ji46c nOl tiSp hai mpch d6 vdi nhau thi tAn sd cQng husng cira mach s6ld rri, rrl c6 d$ t$n ld : .4.al=150(rad,ls) B" rn:75 C" ol: 100 (rad/s) B" 6i = 50 (raCs) CAU 27: Mach dao dQng cria m6y thu s6ng vd fuy6n c6 t.u diqn vd'i diQn dung C vd cudn cim v6i dQ tg cim L, thu duoc s6ng di6n tri c6 bu6c s6ng 20 m. D6 thu duoc s6ng di6n tu co buds s6ng 40 m. ngud'i ta phAi mi, song song voi tu diqn cria mach dao d6ng trdn m$t tr; di6n c6 diQn dung C' bing A. C. 8.2C. C.3C. D.4C. CAu 28: Mqt s6ng 6m truydn ffong kh6ng khi. h4uc cuong dd 6rn tai di6m M vd tpi ditim N 6n luqt Id 40 dB vi 80 dB. Cu.ong d6 Am tai N lon hon cudng dQ 6m tai M A.40ldn. ts. 10001a;. c.21dn. Cdu29: Trong mach dao ddng LC c6 diQn tro thuAn bing kh6ng thi A. nlng luq"ng fu truong tQp trung o cu6n cdm vd bi6n thj6n vdi chu ki bing chu ki dao d6ng ri6ng cua mach. B" n[ng luqn8 di6n truong t6p trung d tu di6n vd bien thi0n vdi chu ki bing chu ki dao dQnfri6nicia mach. C. ning lugng tu truong tdp trung o tu di€n vd bi6n thi0n vdi chu ki blng nfa chu ki Juo CIng ri6ng cira mach. D. n[ng luqng di6n truong t6p trung 6 trJ di6n vi bi6n thi6n v6i chu ki bing nua chu ki dao d6ng ri6ng cua mach. Cfru 30: MQt m6y bif". tli c6 clQn so c6p i00 vdng dAy dugc mic vdo m4ng diQn xoay chi6u c6 hiQu di6n th6 hi6u dirng 2?0 v.' Khi d6 hi6u di6n th6 hiQu dpng d hai ddu cudn fhu cdp d6 ni h +s+ V. B6 qua moi hao phi cria mdy bii5n thd. SO vong dAy cta cu6n thu cdp ld " c.250. C" 200 N/m. H3 B. 10000 I6n &.200 D" 50 N/m. CAu 3x: M6t con lic lo xo cd kh6i luong vAt nh6 ii 50 g. Con lac dao ddng diAu hoa theo m6t truc e6 dinh nim ngang v6i phuong trinh x: Acosrrrt. Cir sau nhii'ng khoing tho'i gian 0,05sihi d6ng n6ng va tn6 ndng cua vAt lai bing nhau. Liy n2 = 10. I-o xo cua con lac c6 d6 clng bini: .e. 1i0. w.220. A. 100 N/m. 8.25 N/m. A. Hinh L H2 E.llinl 2 C6m 33: ltulqt v6t dao d6ng di6u hda c6 phuo,ng trinh +A Cffu 32: Ki hidu r le d6 tdn cira Sirc phuc hdi t6c dung l6n mdt v6,t dao ddng di6u hda. E6 rhi ndo sau, dAy bi6u r.X ,.i -i. dren su bren doi c[a F theo ii dd x cu.r vAt. 0 I F{ cia"vdt. F{6 thfc dring ld: , (rt' a' E r - LL n" -t T 7 - t-r V- {rl' ",2 ^1 v d .1 T-; - in t0- *l ",2 ^2 * \' cl ^) .ri -rl- C. Hinh 3. F" Hinh 4. x: Acos(cot + q). Goi v vi a lin luqt ld v6n teie i,d gia t6e )) YCl . 't t 1-ft a\,- , rl- .4, It4it troi C. Ddn thriy ngAn CSu 35: DiAu ndo sau d6y ld SA{ k}i ndi v€ cdu pha? A. d6 vd cam C. d6, cam, ving vd luc A" Trong m6ry phi*di€n xoay chi6u ba pha c6 3 cudn dAy gi6ng nhau, b6 hi l6ch ohur l vons tron tr6n stato. 3" ts. M5y ph6t dign xoay chidu ba pha khi ho4t d$ng tao ra ba ddng didn xoay chidu mgt pha. C. M6y ph6t di6n xoay chiAu ba pha hoat ddng d-ira trdn hign tuqng c6.m ring di€n tri vd su dung hr truong quay. D' C6c cuQn d6y cua Mrly ph6t di€n xoay chi6u ba pha c6 th6 mic theo ki6u hinh sao hodc hinh tam gidc fuy cdch su dung. CAu 36: Il46t con l6c ld xo dao dgng diAu hda. Bi6t ld xo cd dd cirng 36 N/m vd vpi nh6 c6 kh6i luong 100 g. L6y nz = 1A. Dgng nlng cira con iic bi6n thi6n theo thoi gian v6i tAn s6 B. Hd quang didn B. Edn ddy t6c c6 c6ng suAt l0W tao vi nguy6n tic hopt ddng cua m6y phrit di0n xoay chi6u ba tu.121tr2" B. do, cam vi ving D. dd, cam, vdng, luc vd lam A.5 Hz. E. 1 Hz. C" 3 Hz. ciu 37: Nung n6ng mdt cuc sit eiin 10000c, quang ph6 cria n6 co c6c mdu C.au 38: MQt s6ng dung trdn ddy c5 dang u =2sin(ruci3).cos40nt cm cua m6t phin tu m6i tnrcrng md vi tri cAn bing cua n6 crich g6c m6t khoing x(cm), xdc dinh vdn t6c truy€n s6ng tr€n ddy: A" l20cm/s B. 120 m/s C.)40 arnt< r) An ^*r- C6u 39: MQt s6ng dm truyAn trong thdp vdi tdc dq 5000 m/s. N€u dQ l6ch pha cua song am d6 o hai diem gAn nhau nhd.t c6ch nhau 1 m tr6n cung m6t phuo'ng truydn s6ng ld l thi tin s6 cira song b[ng 2" Cflu 40: Ba di6m A, o,. B th"eo thf tu cung nim"tr0n mgt duong thing xu6t ph6t hr o (A vi B o vd hai pliia crja 0). Tai O dat mOt ngudn di6m ph6t sdng 6m d[ng huo"ng ra khdng gian, mdi truong khdng hdp thu 6m. Mfc culng dQ Am tai A ld 40 dB, tai B ld 20 dB. Mric cuong dd Am tai trung di6m I,{ cta doan ABld .4. 2500 Hz. W DSA Hz C. 5000 Hz, D. 1000 Hz. A" 40 dB. 8.26 dB. c.25 dB. D.27 dB. A" Fa*u*: mg + kA. E" F5ru*: IIig. d- E' - l,h vo r dntal \aa, S. Fan'u*: rng - lrA. .a" 3,37s E" 1,19s c" 3,25s I)" i,97s CAu 43: Eidu nio sau dAy n& sai khi n6i vd nhac Am? A" Am sic phu thudc dn s6 vA bi6n dQ. E. Nguo'ng dau hAu nhu khdng phu thu6c tAn sd 6m. C" Ngucrng nghe nh6 ntrdt vOi im c6 tAn sd nho. F" Am trdm c6 tAn sd nh6 honAm cao. CAer 44: Trong thi nghiQm giao thoa s6ng co tr6n mIt nudc hai ngu6n kdt hop dao d6ng cing pha vdi tAn s6 l0Hz, T6c dd truydn s6ng tr6n m6t nu6c ld 20cmls. F{ai di0m M, N trdn m5t nud'c c6 MA:14,8cm, MB:20,5cm, NA=32,2cm, NB=24cm. sd duong van clrc dai, cuc ti6u trong doan M vd N id : A. 8 duong cuc dpi, 7 circ ti6u. B. Tdubng cgc dai ScUc ti6u. C" 7 ,Suong cuc d4i, Tcue ti6u. F. 2 dr;ong cuc dai, I cuc tidu. CSu 45: Mdt ch6t di6m dao ii6ng di6u hoa theo phuong trinh x = 3 cos(Snt + lXcm) (x tinh bing cm yi t tinir J hing giAy) Trang ni6t giAS' dAu tr6n tri thd'i c{i6ni t : rt, ",hilt diein di qti.a i"ri tri r:* lid"d z :+2cni. k.7',21r,. *" 41iii, C" 5 liii. D" i lau. CSu 46: Ba chim tia do, luc, vdng cing song song vdi tn;c chinh cria th6u kfnh l6i, sau khi qua th6u kinh, sa 3 chrim tia ddu h$itu tai nhtng di6m tr€n truc chinh nhfing di6m ndy c6ch th6u kinh nhfrng knoeng l6n luqt le fd, fi, f lv. A"fi< f,< fd. E.fd< fi< f". C" fo: fi: f". B.fa< f,< fi. II" PHAN runnC ( 10 cAu) Thi sinh chi iluge tim, tr trong 2 phAn ( phAn A ho4c ph6n B)" .d. Theo ehumg trinh chu6n ( 10 c$u tl} cf;u 41 tl6n c6u 50) : CAu 4tr: Treo quA cAu khOi luqirg m vdo ld xo c6 dQ cung k iai noi c6 gia t6c trong truong g Kdo qua ciu {0ch khoi'ri tri c6,nbing mQt do4n x6- a rdi tna,nhe cho dao dQng didu hoa. Lpc ddn hoicr;c dai i6r dpng idn qua cAu la: C6u 42: Mdt 6t6 chuydn ddng thing nhanh dAn dOu trdn doan duong nem ngang d4t vin 6c lhkmlh sau. khi di qu6ng duong 100m tinh tu ch6 khdi hinh. TrAn 6t6 treo con [,6c don dao dong dieu hda c6 chidu ddi { : lm, Ldy g: l0m/s2. Chu ki dao d6ng cua con lic ld : C6u 47: Xdt hi6n fugng sdng drmg h6n ddy ddn hOi nhe AB; DAu A dao d6ng theo phuong i'u6ng g6c sqi dAy vdi bi6n d6 a; Khi dAu B cd dinl, bi6n d0 dao dQng t6ng hoo tai di6m M tr6n d6y cich B mOt doan d id: CAU 48: Mach chon s6ng crla m6y thu gdrn cudn cdm Zpll vd f.u diqn C = 1800 pF thi c6 th6 thu t6t s6ng co bu6c s6ng ld: A. 113m c.62,8m CAu 49: Ggi 86 1A c6m irng tu euc dai cira I, trong 3 cudn ddy d dgng co kh6ng ddng b0 3 pha, cim ung tu tdng hqp eira tu trulng quay tai tdm stato c6 t4 s6 b[ng bao nhi6u? ,{" B = 0,586 B.B=Es C.B=3Bs *. B: 1,586 a.zalsinffl g.2^r*r?4 A 8.6,28m {.Zalcos?41 1-J h ^ L/tLt il" /asln - A S" 1"31m CAU 50: Gia ffi cua diQn 6p higu dpng trong m4ng dign dAn dung 6 nudc ta A. bing 110 V. n. bing 220V. c. thay ooi ru -220v ddn+ZzaY. D. thaycol tri - 1i0 v d6n + 110 v. B. T'heo chuong trinh n6ng cas (1{} adu tir cAu 51 d6n cdu 6S) : cau 51: M6t thanh c6 kh6i luong kl6ng d:lng k6 ddi { c6 th6 quay trong rnrt qnils nim ngang, xung quunh mdtiruc thing dung di qua o dau o cria thanh. 86 qua ma s6t d truc quay. Tr€n thanh kho6t m6t rdnh nh6, theo d6 vi6n ll :1, *5t luong 1 cliuvfn dQng tr€n_rdnh nhd dqc theo rhanJr (hinh vE). Ban diu bi 0 rrung dicm thanh vi thanh uit oau quuy uoi vQn tdc g6c o6. Khi bi;;rc" dd* 66;il A;r,ila" rd. ga .,iu rhunr, li : A. 4r,.ls . B.oo . C. asl4. D. 2rDs , cau 52: r4$t da onl8,g:it guav quanh tryc c6 dinh di qua tam vd vudng g6c v6i mlt phing dia v6i ttic ri6 g6c k:h6ng OOl. Haqt di€m bdt fc! nim b m6p ffa A. chi c6 gia tdc hudng rAm md kh6ng co giatSc d6p my6n. B" c6 cd giat6c hudng tdm vd gia tdclidp tyrin C. kidng c6 ch gia,tdc hud'ng tAm vd, giat6ctiilp tuyiln. D. chi co gtat6c ti6p tuy6n md khOng c6 gia t6c humrg t6m. ciu 53: tul6t vdt tl o:?t -Q:*.h m6t trpc e6 einrr di qua vat c6 ghuong trinh chuy6n dong Q :10+r2 {rp tinh bing rad, t tinh bing giav). T6c d6 g6c vd g6i me vdt quay door ruu tilti gia? ilj1jilt-a]e*'t:o ti""Trnr,u A. 5 rad/s vi 35 rad. B" i0 radls vd,25 rad. C. i0 radls vi 35 rad. &" 5 rad/s vd\5 ,rrd. oei tf:Jt:ng so d6 cua m6t mrly ph6t s6ng v6 tuy6n di6n, khdng c6 mach (tAng) A" bi6n di6u. E. khuCch dai. C" tdch s6ng. D. ph6t dao rl6ng cao t6n. CAu 55: Mdt m4ch di6n xoay chi€u khdng piAn nhrinh g6m: di6n.tro'thuAn R, cuon dAy thuAn c6rn L vd tu tii6n c. Det vao hai dau dopn mach hi6u aieninc xoay chicri c6 tdn s6 "d htc" dtc#d d; ,r* ffi;;#t.;;;; v6n k6 (v6n k6 nhiQt) e6 di€n trb rhtldn, lln lucrr do hipu dipnthti ;rrriia" toeo*urrr,l,.iaA,,"aicn vd hai diu cu6n day thi sd chi cira v6n kr5 tironrg ung ra u, u;,'tr. ele; u = u; :;.u] 11;:i;il;'#i.u. ,*n ,,c" r- !'') -1 "., I - fz li,:A. cos A=+ B. cosp:1 C" cos , Z l>.uosp:i L"coSA=, B"coSA=; cau 56; Do tdc dung,;ria m6t momen hdm, momen dOnqJugng cira m6t b6nh de giam tir 3,00 kg.m2is xu6ng cdn 0.80 kg.rn2ls trong thtri gian 1,5 s. chon chi6u duongia ,hi5o ;h#;;6"g. fil;r" crja luc trbm rrung binh trong kho6ng thoi gian d6 bing: h. -r,41kg.m2ls2. B" - 2,53 kg.m2ls2. c. - 3,30 kg.m2lsz. B. _ 0,5g kg.m2is2. rem €'7' l'"Tq"rioi r" -'ie dinh tde dd cfa m$t ngudn Am bang eaiel, s'ii dr,ing tlii€t L.,r do tiri so air,. ii6l ngu6rr 6rrr ;6 I r5t/vl r0 ;Lt -t ,!- ="F - :i, *,- ^ ; uljqrLlr^uwrr5 ,-*r,s_,;'iu lei gA, ;Lrjt bi ;huii,Jairg iiiliig'y€ii tlii .:irl6t'i;-or;;;;;. . neuQn 6m chuydn dod thd;;6;;;i;;g t6c d6 ao ,u *u tr'ietii'tlii,r,i.iliH;Jil ii"Ti, ':*i;#;';;."#i l*1" 1m vd thititbi tuon ctng nim trcn ['l uy:"g rhid,;ilJ.'rrl!"a; i* ,n;; ffi k1''5'o,ffi t6c dQ truy6n am trong mdi truo'ng bing 338 m/s. Toc d6 cria nguon am nay ld A.v = 25mls. B.v = 35m/s. c.v = 30rn/s. B"v = 40na/s, C0u 58: Dia trdn d6ng chdt c6 truc q,uay O, bdn kinl R, khdi lu-o-ng m. M6t soi d6v k_h6ns co ddn c6 khtii luo'ng kh6ng d6ng ke qrdn ueo tru, gAu r.o ao *uof rno? "ir tirbil;*gl.o.g u";"* A m (hinh vC). Bd qua moi ma s6t. Gia tdc a cua v6t m tfnh theo fia t5c roi tu do g Hl - o D Y I [], 7o Fr "6 4 A. g. )o F \ 3 o EB. O 1 J cdil 59: M$t bdn trdn phing nim ngang brin kinh 0,5 m c6 truc quay co einl rhing dfng di qua rdm bdn, hdomen qu6n tinh cua bdn oiii voi truc quay n ey mz fq rt,nan {anj ouuy aau ;frd;6"; ac 2,05rad/s thi nguo.i ta d[r nhe m$t vat nh6 ktr6i tuqng o,i tg vio m6p bdn.vd vat dinh"chpt vdo d6. 86 qua ma srit d truc quuy ia ,t. .an. _a cria moi trucrng. Tdc dd g6c cua h6 (bdn vd vat) bing : A.Zradls. ts. 0,25 rad/s. C" I radls. D, 2,05 rad./s. CAu 60: Trong dao d6ng di€u hod cria ch6t di6m, chdt oiem d6i chieu chuy€n d6ng khi A. luc t6c dung bing kir6ng. B. luc t6c au"e,ial.iij"l ^ c. lgc tdc dung c,5 dQ lon cuc dai. ^o. ,0. t6c dun! c6 d6 l6n ct,c ti6u. ; HET , nAr An *t rmr :rxrtl zucuvelq E{uB B*,T 1 - 20tt nadru r,* 1A 7D 3B 4D 5A tfD 7B BC 9C 10D 11C T2D 134 L4B 15C 168 ;-r, _t1$ 18D 1D 2D 3C 4B 5A 6_D 7D 8C 9C 10c 1.1 D 4C 5D CT 7D 15D 184 zLB 274 1D_ -7D 3;r 4D 5D .,; CA 7C 8D- 9B 10c 2A _ 9D_ 7B 8A 1.D -24 3A 4D trn 5B 7B 8B 9B l"0c T7.C l_2 D 13C 14D rn .lD 6A 8B 9C 10c 11_C 128 TN 8D 10_A 118 12C 4an LJU 14C 1"5 B 1A 2C 1C 2.8 3C3B LB 9D LD 2C 3B 4B 5A 4B r.3 ts 11D 12D 178 -LJ L 134 8C 9C 10c L4C 9C 14D 1s9 ,Lt) U 188 268 27c 2q_D 29s 14C 1s4 -164 i-74 18C v9c "20.A" 7',J"C 1-1_B r29 r.3 B 224 234 744 2lD 258 104 114 L7C t_3 c 144 L5B l_64 L7g L8D 19A 20c ?19 224 23D 248 2sc 258 278 154 16D ,_.' t* t8A 25D a? a zt H. 28C 25D 27C 28D Dl -l ul x_9 J.] 1_9 2A A n ,i-t i7E 2p 27 I:' L 204 z:a 2L L6c 158 I 15D 18C 254 19A 194 204. 21,C 22C 22D 238 23A 24D 248 25D 25B ].8 B 1_9 B 198 208 218 2LA 278 228 72D 238 744 23C 23D 24D 244 264 77C 28C 258 ')c n ?J_c 288 28D 77C 28C 28C 29D _2_9_A 224 23C 24A 258 29D 29C 29s 29B ?OA 34A 35D 36C 378 38A 308 31D 328 338 34D 3sc 36A. 378 38A 398 40D 41,4, 47D 43C 30c 31C 328 338 34A 3s4_ 36D 37C 38C 39A 40A 418 42A 43_q_ 448 458 488 ,i;,- 50A 30-D 31C 328 30D 31A 32A 33C 34C 358 368 398 40A 41,C 428 33A 508 334 34D ;:;.^ *-" 35C 368 37C 38B 39A 408 30-c 314 3-2 C 33 D- 34D 358 368 37C 3BA 398 40A A1r +JL 428 43D 44D 45D 4:5A A-7 n 48A +9lr s04 51C s3c 54C 364 37e 398 398 30A 318 32D 33D 348 35D 30A 31A 36C 37A 388 32C 30A 31D 32C 338 34D 358 C f 3V 3B 44C | 4sB | +on I +3U 508 461\ 47A 47D 48A 42D i _- -_ 43D I 44c I 4sB I?JTJ i __ 46A I 47D I na ^ I +()Pr I __ I I 45D- 464 A-1 A 48D, +3D 50c 5_18 524 53C 54A 558 55C 578 58D 434 flc atn 45C Anf ntr h 46C 45A /1-7 h llfI io fi io n +oD 43U 508 qnn 51D 52A 52D 53A 54D s5B 55C 568 5VC 40A f1A 424 i_8 D I?D 60D 418 4 -74 438 448 43A 44C 39A 40D 418 47D +9U 51D 45D 46D_ l 47D I ;;l 51C 51C 51A 524 524 538 53C 53A 54C 54A s4D 554 :s"l 568 558 56A 55B 57C 574 s8c 588 59C 594 528 528 538 +3U 50c slD 54D !8D 59A 5_8_D- 598 60D U D 53 54 55C 55D s5A 56C 57C 578 59 D- 60D 60c 60A 578 60D 564 . 1 '2 D. Trong s6ng didn fu, di6n trucrng vd trr truong bi6n thi6 n theo thoi gian v6i cilng chu ki. C6u trO: Trong thi nghi6m Y-Ang ve giao thoa 6nh sdng, nguon srlng ph6t d6ng. iling." J -Y-'D s. bi6n thi6 n tu6n hodn theo thoi gian vdi chu lcj'bing m6t nua chu kj'dao dQng cua vdt. C6u X6: Dbt hi6u dign thii u = 100.Ecos100nt(V)vdo. Khi di6n 6p tuc tho,r n trong mach ld l50V thi cucrng dQ ddng di6n tric tiroi trong mach li 1,2A. Khi di6n 6p tuc thoi trong rnach ld 4OJmry) thi cuong dQ dong diOn tric thoi trong