PHONG GIAODIJC VADAO TAO TIIAI\HPHO.BAC GIA]TG DE THI GTAO vlnx GIoI cAI, THA]TH r,uti xAtu Hec lotl - zfrtz Mdn: V$ I Li Thd'i gic*t ldnt ltui I :0 ytltt?t DE CHINH THII'C Bni 1. 1+ Ai6m;: MQt chi6c 6ng bang g5 c6 dpng hinh tru rSng chi6u cao h .= l0 cm. ban kinh trong Rr : 8 cm, b6n kinh ngodi Rz: l0 cm. ffrOi lugng ri0ng cira 96 ldm 6ng la 800 kg/m3; 6ng kh6ng tfr6* nu6c vd xdng. a) Ban ddu nguoi ta d6n kin m6t ddu bdng ni lpn rdt m6ng (ddu niy dtrgc goi ld driy). OO AAy xing vdo 6ng r6i nlig nhdng tna Ong xu6ng nudc theo phrrcnrg thang clu'ng sao chcr xhng khdng trdn ra ngodi. Tim chi6u cao phAn.n6i "uu 6ng. Biet kh6i lrrnng ridrig ctia xdng lir D1 : 750 kghn3, crii nudc la D0: 1000kg/m3. b) ?6 htit xang ra khoi 6ng, b6c d6y ni lon di vd dfit 6ng tro lpi trong nu6'c theo phuong thdng dring, sau d6 dO tu tir xSng vdo 6ng. Tim kh6i luqng xdng ldn nhAt c6 thC clir vdo trong 6ng. Pldi 2.1S AiOml: Nudc m6y' c6 nhiQt dg 20"C. Mu5n co 20 lit nucrc 6nr cr nhiQt dO 35"C de tirn cho con, rn6t chi dd dirng 4,5 lit ntrdc nftrg o nhiQt dt) 95"C rt6 pha i,6i nu6'c rnirv. Ir{di' a) Lugng nudc.n6ng d6 cir dir khfing? Thira, thiiSu bao nhi6tr? b) Ntiu dung hdt ca 4,5 lit nu6c nong trOn (ir 95"C), thi dugc bao nhi€u lit nu(rc Am ir nhiet d0 35oC? 86 qua mqi mAt m6t nhiQt, cho rdng 1 lit nudc c6 khdi lugng lkg o cdc nhiQt dQ trdn. Bni 3. (6 tli6m): Cho mpch diQn hinh L HiQu dien th6 dflt vao maclr U: 6V kh6ng dOi; R, :2f.i R2 : 3f); R* ld mQt bi6n tro c6 dign tro todnph6n ldl}f.; ddn D ghi 3V-3W. Coi diQn trcr Cira den kh6ng d6i, kh6ng php thuQc vdo nhiQt tlQ. Eiqn tr0 cria ampe k6 vd d6y ndi khdng ddng k6. 1) Khi kh6a K m6: a) Cho Rac : 2O. T'inh c6ng su6t ti6u thu cria ddn. b) Tfnh RAC d6 ddn s6ng binh thudng. 2) Khi kh6a K d6ng: COng su6t ti6u thp cria diQn tro R2 la 0,75W. H6y x6c ilinh vi tri con ch4y C vd tinh s6 chi cria ampe k6. Bni 4. (s tli6m): 1) Tr6n hinh 2. Dudng thdng x ld trgc chinh cira thAu kinh. S ld vpt thAt, S' la anh cria S qua th6u kinh. Trong m6i trucrng hqp: a) Hdy cho bitit 6nh S' ld 6nh th4t hay inh 6o, thAu kinh ld hQi tg hay ph6n ki. b) N6u c6ch x6c dinh quang t6m O vi c6c ti6u di6rn F cira thAu kinh. S. S" S: a) S: b) .**-\*i*-*****l Itr , i A i l { -*f-"r- ,(s, 1 l-1 j_.r* _i tr rl I lltr IJ " ,,, Ir ,l('' B VT ,.\, I *-*{_j_'-_}*- *-' l{' [ linh I Xx S. S: c) Hinh 2 . 2. MQt ngudi chi c6 thi5 nhin rd dugc vflt qan nh'5t c6ch m.6t 60cm. FIoi ngudi 5y bl tqt m[t c{n hay mdt ldo? Mu6n nhin 16 dugc vflt gdn nh6t cdch m[t ld 24cm thi ngrrcri do phAi deo 1o4i kinh ndo? C6 ti0u cg ld bao nhi6u'/ Bni 5. (2 tli0m): N€u t6rn tit rnQt sd hopt dQng dpy hgc tr0n l6p voi bin dO tu duy. Cho vi dP minh'nul utrt . Ir{di' a) Lugng nudc.n6ng d6 cir dir khfing? Thira, thiiSu bao nhi6tr? b) Ntiu dung hdt ca 4,5 lit nu6c nong trOn (ir 95"C), thi dugc bao nhi€u lit nu(rc Am ir nhiet d0 35oC? 86. TAO TIIAIHPHO.BAC GIA]TG DE THI GTAO vlnx GIoI cAI, THA]TH r,uti xAtu Hec lotl - zfrtz Mdn: V$ I Li Thd'i gic*t ldnt ltui I :0 ytltt?t DE CHINH THII'C Bni 1. 1+ Ai6m;:. MQt ngudi chi c6 thi5 nhin rd dugc vflt qan nh'5t c6ch m.6t 60cm. FIoi ngudi 5y bl tqt m[t c{n hay mdt ldo? Mu6n nhin 16 dugc vflt gdn nh6t cdch m[t ld 24cm thi ngrrcri do phAi deo