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TR G DIISP HA NOI TRTIOI{G THPT CTTUYNN (Thoigian ldmbdi: 90phnl Ma ifi thi rll Sd b6o danh: DE THT GOM 50 CAU GTI CAU DEN CAU SO;DANH CHO TAT CA THi SINH Ciu 1: MQt ddngdi€nxoay chi6uc6 cudrngdQtuc thoi: i =2J-2cos(l00nt), (trongd6 i tfnh bing A t tinh bangs) Ph6tbii-Au ndo saud6y dring? A T'Ans6 criadongdiQnh 100Hz B Tan sti g6c ciradongdiQnld 100Hz 0, c' cuongd0higudungcriaddngtliQnliLzA D Dongdi€naoicrueri:r+ rii irorg giay ciu 2: MOt mach dao ddng, gom cuon ddy thudn cam c6 d0 tu.cem L vd tu di€n c6 dipn dung c, dang thuc hi6n dao ddng rtidntir ty chu ki criadao d6ng mach ld c.2,8 2vJLC' D zrJLC cffu 3: D[t di€n 6p xoay chidu z =(Jocos@tvdo hai ttAucria mQtdo4nm4chchi c6 cu6n ddy thudnc6m vdi ddtu can L Dong iliQnxoay chiau chay mach c6 bi€u thfc lI tr A.i={coslarr-1; B ' it = 7u ,o.a L, -c.o.s l @+t;/)T , , D toL-""'*- 2/' rl g ; =3cos(at +L\ _il u D ' jt -=\ (JoaLcos(a, ' olL 2/ z CAu 4: Phritbi6u ndo sau $ey dung? A Ddng diQnxoay chi€u mQtpha chi m6y ph6t diQnxoay chidu mQtpha t4ora :gJhe B' Ddng ttiQndo mdy phdtdi€n xoay chidu tao t.r6n c6 tdn o uangralJtig quuviro.rg mQtgidy cria rdto c Su6tdiQndQngcriamiiyph6t dien xoay chidu ti lQv6i t6c d0 quay cta roto D Chi c6 dong xoay chidu ba pha moi t3o dugc tri truong quay Ciu 5: Budc s6ng.ldkhoangcrichgita hai di6m A gannhaunhat trdncung mQtphuong.,*{9n dQngtai hai di6m d6 ctrngpha 16ne1d dao gll nh6t md dao JOng.tai trai dltlm AO."ng"pf"rl tai hai di€m d6 nguoc pha tai hai di€m d6 cirngpha )ai loAr rdnh h6a ndns n t6t eCcho Jhringtr6 thanhc6c electronddn ggi ld c' HiQntuqng di€n tro cua ch6t brin dAn.giem ^di 9i -"*g n6ng ggi ld hiqn tugng quangd5n D HiQntuqnsquansdanh hiQn tuongoandi-en vdtin hie, did;iTi";;;';*r n rg khoangtdi rang t6i Ciu 9: MQt m6y bi€n rip c6 s6 vdng dAy cira cu6n so c6 l6n hon sd vdng ddy cria cu6n thu cdp M6y \ bi6n 6pndy c6 t6c dung A tdng cudmgd6 dot'rgdi6n, ting diQnrip B giam cudng dQddng di6n, tdng diQn6p c gi6m cudng dQddng di6n, giam diQn6p D tdng cuong dQddng di6n, gi6m diQn6p Cflu 10: Theo thuyi5tlucrngtt 6nh sring,phitt bi6u niro sauddy dung? A Nhirng nguydntri hay phdntu vQtchdthdp thp hay bric xa 6nh s6ngm6t c6chli6n tuc B Ndng lugng cria ciic ph6t6n rffi sringimg voi cac irhs6ng don sic kh6c nhauthi c6 gid.trinhu nhau,'khOngphp thuQcvdo budc s6ngtffi sang C, Chim 6nh siing ld.ddnghat, mdi hat gqi li m6t lugng ru 6nh sring(ph6t6n) D Khi 6nh s6ngtruydn di, c6clugng tt anh srlngcdngd xa ngu6n sangc6 ndnglugng cdngnho CAU11: S6ngttiQnttr ld A s6ngc6 diQn.t*ctogvd tir trucmgdao ddngcung pha, cing tdn s5, c6 phuong vu6ng g6c voi B s6nglan truyAn lrongcitcmdi trudng AantrOi C s6ngc6 ndnglugng ti lQvoi binh phuongcta bu6c s6ng D s6ngc6 hai thenhphdn