De thi va HDC QG MTCT mon Vat li nam 2016

<span class='text_page_counter'>(1)</span>BO. GIAo Due . vA DAo TAO .. cuoc TID. GIAI TOAN' TREN MAY TlNH NAM 2016. Mon: V~t ll Lap: 12. cAMTAY. C~pTHPT. TIICrj gian thi: 90 phut (khong ki tho! gian giao ad) Ngay thi : 30/3/2016 ChIt. y: - Thi sinh lam bai vao giciy {hi do can b(>coi {hiphat; . - Niu eM bat khong co yeu edu rieng thi kit qua lam trim din 4 chic s6 thdp phein.. Bai 1. (10 di~m) M9t can I~c don dao dong di~u hoa voi chu ky T tai nai c6 them tnrong ngoai luc co 09 1611F thea phuong ngang. Neu quay phuong ngoai luc m(lt gee 200 thl chu ky dao d(>nglAT I = 2,2016 (s) hoac T2:: 1,2016 (s). Tinh chu ky T. Don vi tinh: Chu kjt (s). Bai 2. (10 di~m) Cho mach di~n xoay chi~u eo sa db nhu hlnh 1. BiSt UAM=UMN=35V,UNB=160Y, uAB=150Jieosl00m (v). Xac dinh h~ s6 cong su~t ella mach di~n.. Hinh 1. Bai 3. (10 diim) Lang kinh c6 goc chiet quang A=60o, chiet suit n=J2 d~t trong kh6ng khi. Chi~u tia sang 81 toi m~t ben voi gee toi i. Xac dinh gee t&i i d€ gee lech gifra tia sang toi va tia sang 16 la 0:: 35°. . Don vi tinh : goc (d(>,phta, giay).. Biti 4. (10 di~m) Tren hinh 2 bieu di~n mQt chu trlnh bi~n d6i trang thai ella 0,25 mol khi l;, nrong, Tren duong dfulg ap tir (1) d~n (2), sau khi thuc hien mQt cong AI2 = 1998 J thi nhi~t etc) cua no tang 4 l~n. Nhiet dQ a cac trang thai (1) va (3) bkg nhau. Cac trang thai (2) va (3) nk tren dirong thkg di qua g6c toa d9. a) Xac dinh nhiet dQ ella khi a trang thai (1). b) Tinh cong rna khi thirc hien trong chu trinh tren. Don vi tinh: nhit; i/(> (K); cong (J). Bai 5. (10 diem) Mot cai nem c6 ti~t dien thang 1il tam giac vuong (cac canh co d(l dai thea 19 3:4:5) d~t c6 dinh tren mot dta tron phfutg nAm ngang c6 th~ quay ducc nhu hinh 3. Tren ro~t phang nghieng ella nero c6 ffi9t vat nho duoc dat ill do va he s5 rna sat nghi giua no va ~~t phang 'nghieng la 11== i/4. V~t duoc gift t~i vi trl each 40 em so voi tam quay ella dia. , . Tinh v?n t&e goc 00, nho ?hat ella ilia de V?t khong hi tnrot xuong m~t phang (ve phia tam quay).. ti. p (1). o "". V Hinh2. I. 1 40~m. r. I. J,.. ,.\. I. I. Hinh3. Dun vi tlnh: vdn toe g6c (rad/s). ........................... H~t.. (2). .. v.

<span class='text_page_counter'>(2)</span> BQ. GJAo. Dl}C. VA eAo. DE THI CHINH. cuoc .. T~O. rmrc. THI CIA!. rOAN TREN MA.Y TiNH CAM fAY NAM 2016. Mon: V~t Ii . LOp: 12 IlliONG DAl~ CIAI Bai Bail. (10aj~m). C~p THPT. V;.. CHO aruM. Hurrng dan gi5i. Diem so. + Chu ki dao dQng <'lieuhoa ella con lik don khi ngoai hrc co plnrong. 1,0. ngang: T;;:: 2n. (. ~. \"g!+(~}2. + Chu ki dao dQng diSu hoa cua con I~c don khi ngoai hrc co phuong. 1,5. hop voi phuong ngang goc 20° va huang len tren:. T = 21t 1. \~g!+. (F)2 m. C F. +2gm. 1,5. cosIlOo. + Chu ki dao dong dibu hoa cua con Hiedan khi ngoai hrc co plurong hop voi phuong ngang gee 20° va huong xuong duai:. 1,0. Ket qua: T=I,3989 (s). Bai 2. (10 di~m). 5,0. + Tir dall bai, ta dung duoc gian do vecto nhu hinh ve. + Go,i U, 1ftx ta co: u-l 0~IN (AM+x/=AB1-HB1=AB1-(NBI-~-·--~------------~.'~ I. {,. "MN2. '. I,'. _X2;-. Dr. I. _' u,. (35+26,2975)/150=0,40865. =. Ketqua:k Bili 3.. 2,0. ,':. 1M'. A. AN. N ,. I. I. (35+x/=1502-{/60--)352-x2/ + Dung chirc nang Slove do nghiern co k~t qua x==26,2975(V) Tir do co: k=cose= AHI A B=. 2,0. u-. _:H. :. 1,0. B. 0,4087. 5.0. (Sin. il) + Tai . m~t ben thtr nhat : smu=nsinr, => 'i = arcsin -n-. 1,0. + Tai m~t ben thir hai : sini=nsinr, =>. 1,0. A. ,. ~. ..'. •. (10 diem). . (Sin i, ). r2 = arcsm ~. . (Sin(D + A - il) " .• = arcsm 11 (VI co 0=11+12"A) 1,0. + M~t khac lai co: r. i. I. I. I. fl. + [2 = A.

<span class='text_page_counter'>(3)</span> ,. . ., co: arcsm . (Sini) nen __ I + arcsm. IfSin(D+A-i) n. 1,0. == A. I. ,fl. 1,0. + Do nghiern: co it''''2800'32,S''. 5,0. Bai 4.. a) Tim nhiet dt? TI. (10 diem). + Cong cua khi thuc hi~n trong qua trinh d~ng ap nr (1-2) :. = nRT2-nRTI = 3nRTI (Do T2=. A12=PI(V2-V1). + Suy ra nhiet dQ khi (; (1) lei.TI = ~. 1,5. 4TI thea gia thiet).. = 320,4051923. (K). b) Cong rna khi tbirc hien trong chu trinh tren: + C6ng rna khi thuc hi~n trong chu trinh tren co dQ Ian bang dien tich cua hinh ta giac 123. 1,0 1,0. 1. A:::: 2(V1 - VI )(PI - P3). + Ap dung Mendeleep - Clapayron eho hrong khi tren : Ta co PIVI. = nRTI. =:> V;. = nRTI = An. 0,5. va V2 == 4V1 == 4A12. 3p, + Mat khac vi (2) va (3) dmg n~m tren duong thang di qua 0 nen ta p = _3 V <=> _1. P = _3 V e6 : ...l. PI. V2. P2. PI. V) == nRTI == AI2 ; Do P3 3P3 + V~y cong rna khi thuc hien ta. do £!. ==..E!._ 4Pl. PI. A::::.!. AI2 (p, _p)):::: AI2 (1_12)= 2 PI 2 PI Kef qua: a) T 1=320,4052 (K). =:> Pl ::::~ PI 2. AI2. = 499,5. Bid 5.. + V~t chiu tac dung cua cac hrc la:. (IOdi6m). trong hrc P = mg; pharr luc phap tuyen N; hrc rna sat nghi cue dai. (J). 2,5. + Di~u kien can b~ng If! mgsino. = Feese. mgsina. = Fcosa. +urngcosn + ufsinu. ~ (sina-J1.COsa) F=-.. cosa + J1.sma. (I). -. y. o. 3,0 N. +IlN. N = mgeosa + Fsina hay:. 2. 2,5 2,0. = IlN;. hrc Ii tam F = mc/ r.. (I). 0,5. 4. b) A= 499,5000 (J). fmsmax. 0,5. V2. do. Trong. 3Pl. mg = into2 r. F m. a. (Sina-Jlcosa)g cosa + Jism a r. = 3,2129098. Ket qua:. ill. rad/s.. = 3,2129. (rad/s).. 5,0. Chll j : To cham (hi can eLf vao huang dan giai de chia diem chi tiel. Cae each giizi khsu: neu dung, giam kluio din elf vao khung [hang aidma~ cho di€m . ............... Het. .. 2.

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