Tir vi tri can bing nang v~t len thea phirong thang dirng mQt dean 2em, rbi truyen eho v~n t6c 80cmls thea phuong thing dirng, ehi~u hirong xuong duoi.. Bo qua moi hrc can, v~t dao dQng [r]
(1)sa GrAo DVC vA DAo T ~o LAo CAl CUQC TID cAp TiNH GW TOAN' TREN MAy TINH CASIO, VINACAL NAM HQC 2012-2013 MODtbi: V~t DE THI CHINH THUC THP1) Thai gian thi: 150 phut (kMing ki thai gian giao Ngay thi: 17/01/2013 f)J thi g6m co 10 cdu, trang, mgi adu 05 diim (Chit y: Thi sinh lam bai thi vao ban a~thi nay) Giant khao (Ky va ghi ro ho ten) DIEM CVA BAI THI B~DgSO Iy (ChuO'1tg trinh a~thi) SOPHACH (Do Truong ban chdm thi ghi) B~ng chii' Quy dinh: H(Jc sinh trinh bay van tat each giai, kit qua tinh toan vao liJn kJ bai todn Cac kit qua tinh chinh xac tal chit s6 thdp phdn sau ddu phay thea quy tdc lam tron s6 cua don vi tinh bai Cau 1: M(lt v~t co khoi hrong m = 5,6kg dang nam yen tren san nha, Tac dung vao v~t rn(lt luc keo co huang hop voi huang chuyen d(lng mot goc a = 40° va co dQ Ian la F H~ s6 rna sat tnrot gitra v~t va san la Jlt = ~,26 LAy ~ = 9,8rnls2 ., , a) Tinh F de v~t chuyen d(lng nhanh dan deu voi gia toc a = OAm/s2? b) Sau 3s thi ngirng tac dung 19c keo Tinh thoi gian v~t di them tnroc dung hAn? Dan vi tinh: Lire (N), thai gian (s) Tom tat each giai • K~t qua I I Trang 119 (2) Cau 2: M9t vien dan eo kh6i hrong 100g dang bay ngang voi vi)n t6c 500,4 mls thi xuyen qua m9t qua du co kh6i hrong 2kg d~t yen tren gia dO' a d9 cao 5,Im so voi mat dk Qua c~u chuyen d9ng va roi xuong d§t tai di~m each gia dO'm9t khoang 20m tinh theo phuong nam ngang B6 qua hrc can cua khong Hay xac dinh di~m cham d§t cua dan va ti l~ phan tram co nang da chuyen hoa nhiet nang qua trinh dan xuyen qua qua duo Cho gia t6c tnrong la g = 9,8m1s2• Dan vi tinh: Khoang each (m) Tom tat each giai KSt qua Trang 2/9 (3) Can 3: MQt din phong co kich thuoc 8rn x 5m x 4rn Ban diu khong phong (y di~u kien chuan (Po = 76 crnHg; To = 2730K; Do = 1,29 k~ ), sau nhiet dQ cua khong tang len to; 10°C, ap smlt m cua la 78crnHg Tinh khoi hrong eon lai phong luc Don vi tinh: Kh6i hrong (kg) K~t qua Tom tat each 2iai • I Cau 4: A, B, C la diem thuoc true chinh cua rnQt thAu kinh, B n:1rngitra A va C Neu d~t di~m sang A ta thu diroc anh (y B N€u d~t di~rn sang B ta thu dircc anh C Cho AB= 6cm, BC=28cm Xac dinh tieu ClJ cua thAu kinh Dan vj tinh: Tieu C\I (em) Trang 3/9 (y (4) Tom tat each _giai K~t Qua Can 5: M9t v~t tham gia d6ng thai dao d9ng xt = At sin( 4m + 0,21) va x2 d6 xi, X2 bang em, t bang s Bi~t v~ t6e thir nh~t Dan vi tinh: Bien d9 (em) C\l"C 1,2cos( 4m + 0,62) dai cua v~t la 44em/s Tinh bien d9 AI cua dao d9ng Kit Qua Tom tat each giai :;: , Trang 4/9 (5) Cau 6: Cho mach di~n nhu hinh ve Biet EI = 6,5 V, fl = 0,6 n, E2 = 5,3 V, 0,4 n B6 qua di~n tro day nc3i.Tinh cuong dQ dong di~n qua cac nhanh va hieu di~n the U AB f2 = 0,5 n, E3 = 4,1 V, f3 = E I, fl E2,G B A E3'~ Don vi tinh: Cirong dQ dong di~n (A), hieu di~n thS (V) inh K~t qua Tom tat each giai Trang 5/9 (6) Cau 7: Cho mach di~n xoay chieu nhir hinh ve, R == lOOn, cuon day thuAn cam co dQ tu cam L, t1,1 di~n = 1~4 F Di~n ap U AS = 50.J2 COS 100 IT! (V) v2tr Khi K dong hay K rna, s6 chi cua ampe k~ khong d6i B6 qua di~n tra ella am pe k~, day n&i va khoa K a) Tinh de>tu cam L ella cuon day va s6 chi khong d6i cua ampe co dien dung C ARC {~ 'I b) L~p bieu thirc cua cirong de>dong dien tire thai mach K dong va K rna Don vi tinh: De>nr earn (H), cirong de>dong di~n (1\), thai gian(s) K~t qui Trang 6/9 B K kS Tom tat each giii t (""({ttl; ,I (7) Cau 8: MQt I~e don co chu ky dao dQng la 25 (y noi rna gia t6c tnrong g = 9,8067m1s2 va (y nhiet dQ OOc Day treo l~c co h~ s6 nc dai a = 2.10 - sK - J B6 qua moi rna sat va lire can cua moi tnrong a) Tinh chieu dai lo cua lAc 60°C va chu ky dao dQng cua no 620°C? b) DS lAc620°C co chu ky vfrn la 2s nguoi ta truyen cho qua d.u cua lAc mot di~n tich q = 10 - 9C r6i d~t no mot di~n tnrong d~u co cirong dQ E, cac duong sue cua di~n tnrong nfun ngang va song song voi mat phang dao dQng cua l~e Cho bi~t kh6i hrong cua l~e la m = 1g Hay tinh cuong dQ di~n tnrong E? D~ vi tinh: Chi~u dai (m), ehu ky (s), cuong dQ di~n tnrong (Vim) Tom tat each giiii K~t qui Trang 7/9 (8) Can 9: MQt 10 xo co kh5i lUQ'11g khong dang k~ Treo 10 xo theo phirong thing dirng, d§u tren cua 10 xo diroc gift e5 dinh, d§u dum treo mQt v~t nho eo kh5i luong m = 1~Og, 10 xo eo dQ cirng k = 40 N/m Tir vi tri can bing nang v~t len thea phirong thang dirng mQt dean 2em, rbi truyen eho v~n t6c 80cmls thea phuong thing dirng, ehi~u hirong xuong duoi Bo qua moi hrc can, v~t dao dQng dieu hoa Chon g6c thai gian la hIC truyen van tac cho v~t, chon true toa dQ co g6c trung voi vi tri can bfutg cua v~t, chieu dirong thing dirng huang xuong duoi a)Viet phuong trinh dao dQng cua v~t b) Tim li cua vat a thai diem t='!'3 s Dan vi tinh: Li dQ (em) Tom tat each giii K~tqna Trang 8/9 (9) Cau 10: MQt song co truyen doc theo true Ox theo phuong trinh: u = eos( 4t - O~3JlX) u bang mrn, t bang s, x bang m a) Tim ehu ky song, toe dQ truyen song, biroc song b) Tim t6e dQ dao dQng eire dai cua ph~n tir moi tnrong song truyen qua e) Tim dQ lech pha dao d<)ngcua hai di~m each 2,5m tren phuong truyen song Dan vi tlnh: Chu ky (s), t6e d<)song (rn/s), buoc song (m), Ii dQ mm, t6c dQ dao dQng (mm/s), dQ lech pha (rad) Tom ti'St each giii K@tqui " ., 1I~1l Trang 9/9 (10)