TRUd-NG DAr DE Hgc sU PH4.M HA Ner rHr Tr{d DAr HQC ( LAN s) -2011 nn6N TRIIdNG THPT CHUYTN DHSP var Li Thdi gian 90 philt Md.16 : 151 r PHAN cHUNG cHo rAr cA cAc rni sINH (40 c6u, til cffu I tt6n ciu 40) Cflu Vflt-dao dQng diAu hda voi phuong trinh: x : Scos (ulrt+ nl2) (cm) Sau thoi gian t1 : 0,5.s ke tir thoi di€m ban dAu vflt di du-o c qudng duong 51 :4cm Sau kho6ng thoi gian t2: 12,5 s (kC tu thcvi di6m ban d6u) v{t di duqc quAng duong: C.50 cm D 36 cm 8.68 cm A 160 cm Ciu MOt vat dao dQng diAu hod : o li d0 xt: -2 cm vQt c6 vdn t6c v, =|Jirckmls); s li d0 xz =ZJi cm v{t c6 vfn t6cv, = -Bn(cml s) Chgn t : li thoi ^ ,J cdn bdng Phucxrg trinh dao d6ng cria v4t xavi tri A x :4cos (4rt + 2rcl3) (cm) C x:4cos (4m -2r/3) (cm) dOng li B D t1i€m vft c6 li d0 x : -NZ vi dang chuy6n x: Scos (4zut + a/3) (cm) x: Scos (2rt - r/3) (cm) CAu MOt m4ch dign g6m diQn tro thuAn R, cuQn thuAn cim L vd tq diQn C mlc n6i tiep, d6 diQn dung ctra tu diQn c6 thdthay ddi duqc E{t vdo mpch diQn mQt diQn 6p xoay ctriAu, d6 diQn 6p hiQu dpng tr6n m6i pnan tir lAn iuqt h Up: 40V, Ur:120V, Uc: 40V NOu thay d6i dign dung cria tu C dA diQn6p hiQu dsng gita hai dAu C le 60V thi diQn 6p hiQu dsng hai dAu diQn trd R bing C.54,24V D.40,67 V A 67,12V 8.45,64V Cflu MQt lac ld xo treo thdng dr?ng, vflt vi tri cdn bdng ld xo gidn cm Kich thich cho vdt dao dQng diAu hda thi thay thoi gian ld xo grdn mQt chu ki ldzTl3 (T ld chu ki dao dQng cta v{t) DQ gian lon nh6t cria ld xo qu6 tfuh vflt dao dQng ld D.24 cm C.9 cm A 12 cm B 18 cm Cfiu Con lic ld xo nim ngang dao dgng diAu hod vdi bi6n dO A Khi vflt nflng chuy6n dQng qua vitri cfln bAng thi git cO Ainn Aiem cni*r gifia cira ld xo, vflt sC ti6p tuc dao dQng diAu hoi voi bi6n dO $ s s aa q 1S v A.A, "# B.2A D AJ', Cffu MQt ngu6n dm c6 kich thu6c nho, phftra s6ng dm ld s6ng cAu 86 qua sg hdp thg vd phin x4 6m cira mdi truong Culng dO am chuAn Io: 10-12 Wlmz Tai mQt di6m tr0n m4t cAu c6 tam ld ngu6n phit 6m, bin kinh lm, c6 rn-irc culng d0 6m le 105 dB C0ng suAt cira ngodtt am ta D.1,3720W C.0,4326W A 0,1256 W 8.0,3974 Cfru EAu O cria m6t sqi ddy dnn hdi rAt dai dao dQng v6i phucrng trinh: u Zsin2nt (cm) tqo m6t s6ng ngang tr€n ddy Vfln t6c truyAn s6ng ld v = 20 cmls MQt di€m M tr€n ddy c6ch O mQt kho6Lng 2,5 cm dao dQng v6i phucrng trinh W :2 cos(2nt - @m) |) :2 C ur,a cas(Znt - n) (cm) : B A.ur,a ui,a :2 cos(Znt +) ("m) , thiD urta = cos2nt (cm) Cdu Khi c6 s6ng dlng trOn mQt sqi ddy clinh6i A Lhoang thdi gian ngfn nttAt gifia hai lAn sqi ddy du6i thdng ld mQt nfta chu ki s6ng B kfroang cdch gifta tliOm nrit 1d diem bpng li6n t ... mQt hQ thi6 n hd B Trong vii try chi c6 mQt hO m{t trdi, d6 le he c6 chrla Tr6i Edt cira chirng ta C Ngan na ln hQ thi6 n hd ctra chring ta HQ mflt troi ctra chirng ta nirn d m6p thi6 n hd D Thi6 n... ,uAt cdcthitiOu kw, : 32 f), d0 tu cim t:;' thu ld kW' D 3,26 kW' mm Di chuyOn c6ch Ciu21.Thpc hiQn giao thoa 6nir s6ng vdi hai khe Idng( Young) mdn dnh (E) xa hai khe them mQt doan 50 cm thi khoing... mdn tdng th€m 0,3 mm Budc s6ng ctra bric xa dirng thi nghiQm li D 0,60 p m C A,54 Pm B 0,40 p A 0,50 p m 8.2,90 c 1,89 a: m lopi s6ng vO tuydn thi A s6ng cgc ngin tl tang diQn li h6p thu manh