THI LÝ L6 2011(SPHN)

rnti'oNc E4.r HQC on rru rFruDAr r{gc (r-AN 6) -2011 s{l rx4,nr HA NQr vAr MOn TRrtoNG THPT cnuytN onsp li Thdi gian 90 philt Mn dij : 161 : Cho bi€t: hing s6 Pldng h:6,625.10-3a J.s; d0 16n diQn tich nguy6nt5 e 1,6.10-re C; ttic dO 6nh sang chdn khdng c = 3.108 ! SINH (40 ciu, tir cf,u tllin ciu 40) I PHAN CHIJNG CHO CAc Ciu Trong c6c phuong trinh sau, phuong trinh ndo m0 ti chuy6n d6ng cira vflt dao dQng di€u hoi? fAr ci A x: 5.cos(10t + J B x = stcos(10t C x: n).sin({ m/s _ rrri - l0t) (cm) +f ) (cm) l.sin(l0t - n) (cm) x:2.cos(1O).sin(l}t-n/2) (cm) lic ld x9 gdm mQt quA cAu 3hd m: 100(9) vd ld xo c6 dQ gring.k= 40Qrl/m) duo.c treo thing dtmg NAng qui cdu l€n thing $ung bing l$." F: l,2$l) cho toi qu6 cAu driiig y€n r6i bu6ng tay cho qidao A[ng f6y g = l0(m/i2) Luc ddn h6i cgc d4i vi cgc tiOu t6c dung l6n gid treo ld A 1,2(lttr);0(N) B 2,2(I',1); 0(N) D Ciu2 Mdt C 1,2(ttr); 0,2Gt0 D.2,2${);0,2(}[) Cdu MQt vQt au" aOng di€u hda tr€n trgc Ox voi cliu k]'T, mdi phrit vgt tfurc hiQn dugc 30 dao dQng todn phAn vi cO iOc AO trung binh lA 0,16 m/s Khi qua vi hi cdn bdng, vft c6 t6c d0 bine D l2r(cm I s) C 76n(cm / s) A \n(cm I s) B 6n(cm / s) : C,nu a MQt lic ld xo c6 d0 crme lr 2N/m, khOi luqng m 80g dao_aOnq1{ diu tr€n mi! pfrinq nim ngang c6 ma s6t, h0 s5 ma s6t trugt giira vpt vdr mit ngang la 0,1 pan d.au kdo vflJ kh6i vi trf cdn bing *Ot eoan l0 cm rOi tna nhe Cho gia t6c trgng trudng g = 10 m/s2 Th6 ndng eira vflt md t4i d6 , vflt c6 t6c dQ lsn nhat ta J C 1,6 mJ A.0,16 mJ 8.0,16 J ?.-1,6 Ciu MQt v{t dao tlgng di€u hda v6i phuong trinh li dQ: x = 4cos(0,5nt -4)@*) d6 t tinh bing 6" ZJi giay G) Vdo thoi di€m ndo sau ddy vgt di qua vi tri x = A.t=1 3- B.t:t(s) -\-/' cm theo chidu duong cira trpc tqa I c.r=slG) 3" clO? t_ D.t=lG) " Ciu Chuy€n dQng cria mQt vflt c6 dflc tinh la cf sau nhiing khoAng thoi gian bing nh6t dlnh thi trqng th6i cta vflt lai lap lpi nhu cfi Chuydn dQng cira v{t d6: A ld dao dQng tuAn hoan B ld dao dQng di6u hda C ld qua trinh truyen s6ng D c6c d6p 6n A, B,C ddu sai Cfru7 MQt d0ne hO qui l6c d€m gi6y (c6 chu ki bing 2s), qu6 l6c dugc coi nhu mQt lic dcrn v6'i ddy A-IOO.tg/m3 GiA sir 0"."g tti treo chAn treo vdLvQt nang ldm'bing OOng-cO'mrOi luqng ri€ng ttri chu ki Ouo Aqng.tta nd bing bao nhi€u? eiet khOi luo'ng ri€irg cira khOng pua abn! hO kh6ng kh6nE trong"khi quy€n la t,l kg/m' BO quu Anh:huong cira llrc cin kh6ng khf d€n chu ki dao ddng li di cfia llc Chgn d6p An dring Ciu s s s C 2,00A12 ts 2,00035 dai luo-ng kh6ng thay d6i lA B MQt s6ng co truy6n tu' khdng khf vdo nttdc, C buo'c ,4 chu ki ctra B t6c dO cfia A.2,00024 s6ng s6ng s6ng Page of 7( ua te t; D" 2,00015 s' D ndng ir-ro-ng TRUoNG TFIpr CHUyEn ogsp HA NOr -rm rHu EAi HQC t AN O-1ZO1 1) - M6n Vat li - ua oa re t truy€n s6ng k€n d?'y 1d240 Cffu MOr day ddLn hai diu c6 dinh dai 1,5 m, dao dQng ph6t dm TOc dQ p/s Khing.eiirh ndo sau cldy lh sai? A TAn s6 am co bin ld 80 Hz ' B Chu ki cua ho4 0m bdcZlit6,25'10-3 s' C Bu6c s6ng cira ho4 Am b4c ld I m' ,' D TAn sO ho4 6m b0c ld 330 Hz ' d6 t tinh ciu 10 cho phuong trinh s6ng dirng tren ddy ld: u = 5cos(4nx)sin(100nt + nll) (crn)' bing s Van t6c truydn s6ng tr€n dAy ld B +^ tileo pnuong +;-,^ iriiut s1 cflu 11 Hai ngudn k€t hqp vir 52 c6ch mQt khoang ia 50 mm oeu ciao dong dQ.s6ng 0,8 (m/s)-vd bi€n rr = acosf2o0nt) rnm tren mdt nu6c Bidrtoc dQ truyAn sing tr€n mflt nu6c tl$ng nsusc pha vdi c6c dao srsz ctra tr€ndubng trung trsc "r.at -ttguOtt nim c6ch ngudn 51 bao nhi€u? D' 26 C' Z! B" 28 'A 32 thi ph6t bi€u cOng,fucrng xAy til5p, noi mlc RLC *ouy diQn mach do4n Ciu 12 Trong mQt "r,iAu ndo sau ddy sai? ffi, thci tr€n di€n tro.' ,q bien 6p tiic thbi tr€n doan m4ch bang di$n ap khi:g b+g cim b" fa;e Het ap m" trtoi tr6n tu eien va-trcn cuQn I iare Aii" ab hiQu dung tr€n tq Tr' A.Tz ... theo n]ruong lganrg Clu ki,dag 10n9.:"u do:e chuy€n thing tl6u lA.Tr' xt l6c don trucrne hqp xi :"PJ,,.5;;t'#';.; ia" e , u"oi gia toc a n rr Bi€u thirc To:u" "na* :T2=T3' C:T'=Tl>Tr' A.Tz