SAMPLE TEST 10.10 FOR FIRST PROGRESS TEST - SECOND TERM - 1OTH GRADERS Complete the passage with the correct alternative given. Write the appropriste letter A, B, C or D on the answer sheet. When'man first learned how to make a fire, he began to use fuel forthe first time. The first fuel lre used was probably wood. As time *(21)-, man eventually discovered that substances such as coal and oil _(22)_. Coal -(23)- very widely as a source of energy until the last century. With tlie coming of the industrial revolution, it was soon realized that production _(24)_ if coal was used instead of wood. Nowadays, many of the huge factories and electricity generating stations _(25)-to function if there was no coal. In the last twenty or thirty years, however, the use of coal _(26)_. As a result, there have been changes in tlre coal industry. lt -(27) that more people _(28)_ coal if oil and gas were not so readily available. There is more than enough coal in the world for man's needs for the next two hundred years if our use of coal -(29)_, . Unfortunately, however, about half of the world's coal -(30) * Mining much of it would be very expensive even if it was possible to use new equipment. Question 21. A. passes B. used to pass C. would pass D. passed Question 22' ' A. are burning B. would burn C. have bumt D. were bumt Question 23. A. not used B. did not use C. not using D. was not used Question 24. A. doubles B. had doubled C. will double D. would double Question 25. A. were unable B. would be unable C. will be unable D. are unable Question 26. A. has declined B. will decline C. declines Question 27. A. believed B. is believing C. believing Question 28. A. would use B. used C. use Question 29. A. did not increase B. would not increase C. does not increase D. may not increase Question 30. A. would never use B. many never be used C. would never be used D. may never use There is one mistake in each sentence below. Find it and write the appropriate letter A, B, C or D on the answer sheet: Question 31. Erosion, which (A) washes away valuable topsoil, (B) can prevent by (C) planting trees and (D) grass. Question 32. The first modern type of (A) printing press (B) was invented (C) with a Gerrnan, Johalnes Gutenberg, (D) in 1439. Question 33. It (A) is estimated that (B) much of a teenager's tirne is(C) spending (D) chatting on the Internet. Question 34. (A) For seveml centuries (B) no real changes (C) made in the basic rnethods (D) used for printing. Question 35. (A) Huricanes from the Gulf of Mexico (B) have been caused considerable (D) darnage to coastal cities in Texas. 'Build up nteaninffil sentences with the word/phrase given. Wite your answer in the space (3d-40) given on your answer sheet: Question 36. we/ now/faced/ problems/ environment. Question 37. erosion/ soil/ result/ when / forests/ cut/ carelessly. Question 38. polluted/ air/ be/ chiefly/ city problem. Question 39. plants/ species/ many/ animak/ be/ danger/ extinction. Question 40. laws/ must/ some/ pass/ help/ protect/ environmenl. ._****mH, Department of Social & Foreign Studies - p"g" t ,. l i.l D. would declines D. is believed D. willuse - E4i hgc Qu6c gia Hn NQi Truhrg THPT Chuy6n Khoa hgc Tr; nhi6n NGAN HANG cAu HoI KIEM TRA C6NG BANG LAN 3 - NAM Hgc zoto_zott MON vAr LV lo c6u 1' MQt tdn lua co khoi tuqng 20 tdn dang chuy6n dQng vdi v6n t6c 200 m/s thi tric rhoi phut ra phia sau hai t6n khi v6i v4n tdc iooo -1, ,o ,roi t6n lua. Hdy xdc dinh v4n t6c cira t€n luu sau khi phut khi? ciu 2' MOt t6n lua-c6 kh6i luong 15 t5n .dang bay thing dung l6n cao. I .ric v6n t6c dat vdn t6c 200 m/s thi n6 tric thoi (hong mQt th& gian rAt l#r) prrut rI phia sau m6t t6n khi voi v6n t6c 1000 m/s eoi voi Tr6i Dat. tdl 4 einh van i6. .,iu t6n luu sau khiphet khi? ciu 3' MQt t€n lta ld6i luqng_2000 kg,yit,ohat theo n1"*g thsrg dring. N6.phpt ra m6i giay m : 100 kg khi vdi vfln t6c v: 1600 m/s. Tfnh gia toc *uAt pnat cualcn triaz Ldy g: 10 m/s, ( K6 ddn lgc hft trrii ddt tac dung vdo t6n lita ). ciu 4' MQt nguoi c6 kh6i lqons m=50:kg dimg o dAu mfri thuy€n co kh6i lugng M: 200 kg, chidu ddi 6 m ddu tr€n m1t*nyoc h6 y€n lpng. sau d6 nguoi di tirdt;;;;;;6;^rh#n, v6i vdn t6c e6t voi thuy€n ld u = 2dl.(Bo qua *qi t\r in) a. Tim vAn t6c cira thuyOn d6i v6i bo? b' Tj*:ii"g dTT* di duoc cua thuydn aoi voi bo vd cra ngudi aoi voi bo khi nguoi d6 di d6n dudi thuyOn? CAu 5' MOt hat nhdn nguy6n ttr ban dAu dimg ydn phdn rd thdnh ba hat: electron, notrino vd hat nhdn mdi' D0ng lugng cita electron ldL p,: 1lo".t.,5e"vr Dong lucr,ng cria notrino vu6ng g6c v6i dQng luqng cta electron vd c6 d0 lcm: pn:3.tot3 t<"g.mls. Hay16c'di.ih vecto dQng lucmg cua har nh6n mdi? ciu 6. M6t vat ci t<tror_luTe 50-kg dat t16.n m4t phang nghi6ng, g6c nghi€ng30o,d6 cao 2m. Nguoi ta kdo vdt trucrt ddu l6n trdn mdt phang nghicng boi lpc kdo song ,on'g uoi "rat pr,*g nghi6ng. a' Tinh c6ng cy3luc k6o^khi.v41 di tu chdn l6n dinh mdt phing nghi€ng, ulet rr9 s6 ma s6t gifra y0t va m4t pl6ng nghidng ld 0,5; g : 10 m/s2.? b. Tinh hi6u suAt khi kdo vflt trugr rr-6n mat phing nghi€ng? cf,u 7' MQt vi€n d4n kh6i l*q.tg 200 gduqc tdng to. tting m6t nong sring ddi I m, du6i tdc dung cta 6p luc khi chdy. I(hi ra khoi ndng sring van t6c cira dan ld 200mls. a. Tinh c6ng ctn 6p h/c khf ch6y ldm tdng r6c dan? b. Tinh 6p lyc trung binh cria khi ch6y t6C dung l6n dan? ciu 8' MQt vi6n dan khdi luqng 0,5 kg bay Suyen qua mQt tAm 96 ddy 5 cm. v{n t6c ngay tru6c kai bay vdo g5 ld 500 m/s, khi .u nroi iam gd ti roo m/s. Hdy xac ainrr luc c6n trung u;n cuu 96 l6n dan? Ciu 9' MQt qui nang khdi lugng 1. kg treo vdo soi ddy ddi lm, dAu kia cria ddy duoc git c6 dinh. Ja1.a,uvc kdo IQch kh_oi vi tri cdn bing de sqi ddy lQch vdi phuong thing dimg goca = 600. Bo qua h9i l"*g cira ddy, dQ gian cfia ddy vd moi ma s6t Hdy tim vfln t6c cira quii ndng vd luc cdng cta soi ddy <y hai vi tri: a. O vi tri ddy lQnh so vdi phucmg thang dung g6c F = 300 ? b. O vi tri cAn bang? Ciu 10' MQt v4t m : 0,5 kg treo.vdo sgi ddy ddi lm, dAu kia cria ddy duoc git c6 ainh. V6t duoc k6o ngang rdi th6 roi. Bo qua th6i lugng cua ddy, dQ gidn cria ddy vd moi ma s6t Ha'y tin';a;;;; ctra qu6 "nAng vd lgc cdng cira scyi d6y o hai vi trf : a. O vi tri cdn bing? b. O vitri sqi ddy ig"tt rrOi phuong thdng dung m6t gqc 30o? ciu 11. MQt vat kh6i luong lkg dang trucxt theo phucrngngang v6i v6n tdc vo: l0 mis thi theo m6t m6ng cong di l6n. Do c6 ma s6t vdt chi l€n duoc d6 cao bing nria dQ cao n6u kh6ng c6 ma s6t. Hdy tim cdng do lgc ma s6t sinh ra? ( i r* 12. MQt vat th6 trugt tt dinh m6t mdt bin cAu nhAn ban kinh 3 i ,, \ n: ,l€n mot vi tri vdt rdi khoi mdt b6n cau. ii. Xac Ainfr dq cao khi vAt roi khoi m4t b6n cAu? Tim hucrng vd dg lon v4n t6c khi d6 cria v4t? ;, Sau d6 v$t chuy6n dQng theo qui d4o nio vir v4n tdc tiep dat b&r.i: bao nhi6u? L|y g: 10 m/s2. C6u 13. Hai vi6n bi co kh6i lugng lAn luqt rnl,rn2, vdi m2:2mr. Bi hai dimg y€n, bi mQt chuy6n dQng t6i v6i vfn t6c 6 m/s tr6n mQt mat phdng ngang nhin. Tim vQn t6c ctra hai vi€n bi sau va ch4m tror.g hai trubng hqp: va cham mAm vh va cham ddn h6i truc diQn? rlong m6i trunng hqp CAu 15. f lai vQt cO kh6i lugng nhu nhau ld 2 kg, u3t *0t chuyOn dQng voi vAn t6c 10 m/s t6i va ch4m vhr v4t hai dimg yOn tr6n mflt sdn ngang nhin. Coi va ch4m ld hodn todn mAm. Tim nhiQt lugng t6a i'a trong qu6 trinh va ch4m? Ciu 16. Mit hon bi dugc tha tir mQt vi tri tren mdng cong c6 d6 cao h:3R Xu6ng chdn m6ng cong n6 sE trugt tr€n m6ng trdn c6 ban kinh R.Bo qua ma s6t. a. Hoi 6p lgc cira bi l€n m6ng tron t4i mdl ei6m A vd B gAp ryAV lAn trgng lugng cua bi? b. EC bi co th'3 r'trgt qua di6m cao nhat g md khdng roi thi phii thi bi tt dO cao t6i thi6u ld bao nhi€u? Ciu 17. MQt thanh AB d6ng cn6t ti'5t diqn dCu m:4 kg, dAu B c6 the quay quanh mQt bdn tA cO Ainn. Nguoi ta treo treo mQt vflt m':3 kg uao'Ai6* D: AD: AB/3.Thanh du<vc gifinam ngang nho mQt sgi ddy AC t4o v6i phuong ngang m6t goc 45o a.Tim luc c[ng sqi ddy AC? b.Tim phdn lqc 0 tryc bdn 16? Cffu 18. Mqt t6m 96 mong hinh vu6ng cpnh a bi kho6t mQt mii5ng hinh ru6ng canh ali. Hay tim trong tdm phAn con lpi cta mi6ng 96? CSrr 14. Hai vi6n bi co kh6i lugng lAn lucvt rnt,nrz, voi m1:2m2 B due;r: ihA d6ng thoi tt hai m6p A v.d B cua mQt b6n cdu nhdn b6n l, nh R : 90cm( B6 qua ma s6t). . a. Tim v! tri gFlp nhau cua hai bi tr6n b6n cAu? b. i.'im v6n t6c cria hai bi sau va ch4m trong hai trucrng hqp: va cham mAm vir va ch4m ddn h6i trgc diQn? c. 'iim d0 cao cuc dpi md m6i Ui l€n dugc sau va ch4m Ciu 19. MQt qui cAu co khOi luqng.300 g d[t giira hai m{t phang, m[t phing mQi ttrane dimg, mat phang hai tao v6i pflt phdng mQt goctr/ = lQo. Hdy x6c din4 6p lgc ctrayat nine l6n mdi m?t phdng nghi€ng? ( Bo qua ma s6i, ldy-g:10 m/s2) V V t\ r-1 ,n f A-^ 2 cau 20' Mot vfit khdi luqng 1 kg nim y€n tr€n mot mdr phang nghiang g6c 30o so v6i phrcrng ngang. a. X6c dfnh d6 lfn luc ma s6t t6c dgng l€n v4t? b' H0 s6 ma s6t nghi gita vdt vd m4tlhang'nghi€ng bing t thi g6c nghi6ng cgc dai bing bao nhi6u d€ v6r kh6ng bi rrugr? cayz!' c6 5 qui.c* Sui lugng .^.2^,3m, 4m, 5m gin lAn luqr rr€n m6t thanh nhe. Khoang cdch giira hai qui cAu c?nh nhau la-d. Tim vi trf trgng tam"ctra he. Cfru2z' Thanh AB.ddi ](m), khoi luqng 10kg duoc d4t nim ngang l6n hai gi6 dd t4i A vd B. Ngucri ta m6c vdo di6m C cria thanh (AC : 60crn) mQt trgng v{t J6 kioi tnqng 6 kg. X6c dinh lgc ndn l€n hai gi6 dd. Ciu 23. Vft d4ng trp, kh6i lugng m: 100kg, b6n kinh R: 10cm. Bu6c vdo v6t m6t sqi 06y ngang c6 phucmg di qua tdm O Ae teo v{t qua b4c thang cao 5cm. Tinh d0 lcrn t6l thi€u cria luc F AJteo vdt l6n tren bAc. Ciu24. Qu6 d4n kh6i luqng l0 kg.dang bay thing dimg xu6ng dudi v6i v6n t6c 100m/s thi n6 thenh 2 mdnh. Menh thri nhAt c6 khoi lusng 6kg bav theJphucnig nsang roi'ra" m. itA;; ilj phuong, chi6u d6 lcrn v4n t6c cira mhnh2. CAu 25. Cho h€ hai vat cO kh6i lugng bing nhau vd bing I kg. VQn t6c cua v4t I c6 d0 lcm lm/s vd c6 phuong kh6ng ddi. VAn t6c vdt 2 co dQ lcrn ld zrrls. fintr dO luqng cria hQ trong c6c trucrng hqp, a. vt, v2 cung phucrng, cdng chi6u. b. \, Ccirng phucrng, ngugc chiOu. c. (v, , v, ) hqp vdi nhau g6c 600. d. (v, v, ) vu6ng g6c nhau. CAu26. Hai vi6n bi c6 kh6i lugng 5 kg vd 8 kg chuy€n dQng nguoc chi6u nhau rr6n cirng mQt qu! dao vd va cham vdo nhau. Bo qua ma siit.giira c6.c vi€n bi va m4t phing ti6p xric. Van t6J.,i; "ia; bi I la 3mls. Sau va cham cA hai viOn bi dAu drmg y6n. Tinh vdn t6c cria ui6; Ui Zf Ciu27. Vi0n d4n dang bay ngang vdi v4n tdc l00m/s thi nd vd thdnh 2 minhc6 kh6i luqng 5kg vd 10kg. Minh nhQ lay l6n theo phucmg thing drmg v6i v6n t6c l00m/s. hoi mAnh to bay-thei phuong ndo? Vdn t6c bing bao nhidu? Ciu 28. Qu.u datt kh6i luqng 2 kg dang bay thang dring l€n trOn vdi v6n t6c 25}wlsthi n6 thanh 2 1Tl_:9 khOi luqng bing nhau. eiet **h I c6 vdn tdc ZSOmls l€ch vdi pft"*g tning il;;;; 60'. Hdi minh con lai bay theo phucmg ndo? Vpn t6c bing bao nhi6u? Ciu29. Nguoi co kh6i lugng 50 kg drmg ydn tr€n mdt toa tdu khdi lugng 250 kg dang chuy6n dQng thing d6u trdn duong ray nim ngang v6i vAn tdc i : lm/s . Nguoi do nhdy xu6ng dAt v6i v6n t6c [: 2n/s d6i vdi toa tdu. Tinh v4n tOc toa tdu sau khi nguoi d6 nhiy xu6ng trong cac trucrng hqp: ,t\,t - a.vollv b. ;, tJ; c. { vu6ng g6c voi i Cf,u 30. Mot q tO kh6i lugng m : lt6n chuydn d6ng thing dAu tr€n m{t dudng nim ngang voi vdn t6c 36km/h. Bi6t cdng ru6t.ul d6ng co 6 t6 la 5kW. a. Tinh luc ma s6t cria mdt dudng b. Sau d6, 6 td tang t6c, chuy6n d6ng nhanh dAn d€u. Sau khi di th€m ducrc qu6ng ducrng s = 125 m vdn tdc 6 t6 tdng l6.d6n 54 km/h. Tinh cdng suAt trung binh cua dQng co O t6 tidn qudng ducrng ndy vd cdng su6t tirc thdi cua dQng co o cu6i quang ducrng. Cdu 31. V4t dugc k6o chuy6n dQng d6u tr6n mdt phAng ngang ntrO ly" f' : jgN nghi6ng goc a: 600 so v6i phuorig ngang. Tinh c6ng cira luc kdo, c6ng cua tiqng luc vd phin lgc N tien quang ducrng dni 3(m). Tt d6, suy ra cdng cua luc ma s6t. Cku32. Vi6n dan khoi luqng 100g dang bay ngang v6i vAn t6c kh6ng d6i 100m/s. a' Vi6n dan d6n^xuydn qua mQt t6m 96 ddy vd chui sdu vao 96 4cm.Xirc dinh luc c6n (trung binh) cira g5. ir, N€u tdm g5 chi ddy 2 cm thi vi€n dan chui qua t6m 96 vd bay ra ngodi. Xric dfnh vdn t6c ctra dan lirc ra kh6i t6m 96. Cir,i 33. MOt truc thdng kh6i luqng 5 tAn. :1. Trgc thdng bay ddu, lOn cao lkm trong thcri gian 50s. 86 qua srlc cdn kh6ng khi. Tinh ^ a. " c6ng sudt cria d6ng co. ir. Trgc thdng bay l€n nhanh dAn dAu kh6ng vdn t6c dAu, l6n cao 1 250m trong 50s. Luc cAn cua kh6ng khi bang 0,1 trpng lugng truc thdng. Tinh c6ng suAt trung binh vd c6ng suAt cuc d4i cua dQng co trong thoi gian tr€n. Cir: 'i',{ Vat kh6i lugng rrr : 1 kg ndm trdqtdm v6n ddi n5m ngang kh6i luqng m2 : 3kg. Ngucri ta truyir, i:ho v{t ndng vin t6c dAu bing 2mls. He sO ma s6t trucrt giira vdt vdr v6n ld 0,2;ma s6t gita v6n'",r, ,:in kh6ng d6ng k0. gung i ,,',h lu^t bdo todn dQng luqng vi dinh li dQng ndng tinh qudng ducrng di cria vdt ndng eOi vOl tdm vd: Cffu 35. r;6t th6i luqmg 100g roi tp do kh6ng vOn tdc dAu. Ley g: 10m/s2. a. rlao ldu sau khi roi vflt co d$ng ndng 5J? 20J? b. ;i.r.u khi roi qudng duonp bao nhi6u, vdt c6 dQng ndng lJ? 4J? c. r inh v{n t6c tai thoi di6m md W6: 3Wi. d. "'',,,; dinh vi tri t4i do mir Wa : 1/2Wt. CAu 36. Hai :,r xo c6 d9 cimg k1 :40N/m, kz: 60N/m n6i v6i nhau bing phuong ph6p n6i ti6p va n0i v6i di6m r 'O ai"n V4t m: 20gg treo o phia du6i hai.lo xo. a. Tirr,, ;X6 bi6n dpng cira mdi ld xo t4i vi tri cdn bang. b. K6* ' ,it xu6ng dudi vi tri cdn bang mOt doan x = 2cm. Tinh th€ ning cira hC tai vi tri d6. Chgn gilr iinh thd nang t4i vi trf cdn b5ng. Cffu 37. Qud cAr; ,rh6 kh6i lugng m = 1009 treo vdo d6u mQt sqi ddy ddi 1(m), ddu trdn cta ddy cd dinh. K6o qud c6,' isch khoi vi tri c6n bing d0 ddy treo lQch g6c a voi phuong thing dtmg riii bu6ng. Bo qua luc ",tn cua kh6ng khi n _ - n a. Tinh t6c ;10 cria qud cAu bi6t a = 300, 600 vd tdc d0 cuc d4i cua qudr cAu khi chuy6n b. uon?rnn luc cdirg ddy bi6t a:300,600 vir lr,rc cdng cgc dai cua quA cdu khi chuy6n dQng. Ciu38. 6 tO ntai lu,,i.g ^: Z t6n dang chuy6n AOng vOi v4n t6c vo : 36km/h thi-tat m6y vd *,.r6ng d6c, di hOt d6c tL,:lng thdi gian t: 10s. Goc nghiOng ctra d6c la d :.300, hQ sO ma s6t ldn gital5c v1 xe |a k:0,*1. Dtutdinh luit bio toirn ndng lucrng, tinh gia t6c cta xe tr6n d6c vd cniAu Aai ddc. L6y q : l_0,!t' . . !. . Cffu 39. QuA cAu thf nh6t. c6 kh5i lugng mr = 3 kg chuy€n.dQng voi vin t6c 1m/s va cham xuy6n t6m v6i Cyi cAu thri hai c6 kh6i lugng i2: 2kg dang chuyAn dQng nguqc chiAu vdi vdn t6c 3mls. Tim v4n i6c c6c qud cAu sau va cham n6u: a. hoirn todn dan h6i b. hodn todn kh$ng ddn hdi (va chpm mAm). Tinh nhiqt lugng tba ra trong va cham, coi l rang toan od nQi ndng cua hQ dAu bi6n thanh nhiet. Cfiu 40. dua "Au .O t frOi t,rqg m = 50g g.in vdro ld xo treo theo phucnlg thing 9,-g, dAu tr6n cua ld xo c6 Ai.nn, Ag cimg k : 200N/m. gan Adu m duoc giir o vf tri lo Xo kh6ng bi0n d4ng. Budng m kh6ng vfln t6c dAu u. Tfnh vdn t6c cua qud cAu t4i vi tri cdn bang. b. Tim d0 gi6n cgc dai cua lo xo trong qu6 trinh chuyOn dQng. Cflu 41. MQt nguoi dimg irn o vi dQ 600 cria Trdi dAt co dQng lugng v6i d0 lcm ld 11629,63 kgm/s A6i vOi hp quy "iieu gi" uOi tAm Trdi d6t. Coi Tr6i dAt hinh cAu c6 b6n kinh 6400 km vd chu kj'tu quay cria Tr6i d6t lit24 gtit. Tinh kh6i lugng cua nguoi do? Chu 42. MQt v4t roi tg-do vdi vfln t6c ban dAu 20 nt/stir dO cao h so vdi g4t dat Tim h dd dQng lugng ctra v{t lirc ch4m Aat g6p 3 lAn dQng lugng cria n6 hic o d0 cao h' \5V e: l0 m/s2. Cflu?f. HQ2 vQtc6 kh6i tiqne i kg vd + kg-chuyCn dQng v6i c6c vfln t6c tuoTrg tmg 3 m/s vir I m/s theo hai phucrng hqp v6i nhau goc 450. TOng dQng luqng cua hQ c6 d0 lcrn bang bao nhi6u, hufng nhu ndo ? ^r-A t^) ^.a^, l^:: ,^^A,^ I.', I n f A^ 2 Ciu 44' MQt lsc 96"9 doi 60 N tang t6c cho-mQt.vQt n4ng 5 kg,chuyen dQng thing tu t6c d6 2 m/s tdi 8 m/s' Khodng thoi gian tang t6c cho vdt ld bao nhi€u? BiCt huong cria luc trtng v6i hu6ng cria vdn t6c. :lf f ,3"u "b9n* tcir6i tuqng 0,45 kg roi tir tr€n cao xu6ng, hic cham m6t nudc c6 v6n t6c 25 m/s. unuyen dong o trong nudc dugc 3 s thi drmg. Tinh lgc trung binh do nu6c t6c dung l6n qud b6ng? c."i4q' IvlQtchitic xe con ning1414 kg dig.di ve nuongborg "Ji iA. ooJ,t m/s thi quav m6r g6c 90' vd hucrng Nam trong thoi gian 3 gi6y ioi ticp tu" Jhuye,iaQng v6i t'6c IO dv Ti;-il. ;;g binh tdc dung l6n xe trong thoi gian n6i tr6n ? Ciu 47' MQt qud b6.ng ryng 0,3 kg chuy6n dr6ng tr€n m6t duong thing vdi v6n t6c 5 m/s toi dap vdo mQt bric tuong vd b! bQt ngugc tro l4i. nict tlrc tiung binh t6J dgng"l6n qua b6ng ld 4g ht. Thdi gian va cham gifra quA b6ng vd tuong la 0,05 s. Tim van toc cua qu6 uong nguy sau va cham vdi tuong? ,C^"" 1s' . MQt qud bolg th6p ndng 0,3 kg va ch4m vdi buc tucrng vdi tdc d9 10 m/s o g6c 600 so v6i bd m{t ctra tu}ng. N6 bi bflt tro lai vdi cung t6c d0 vd cirng g6c"do. gict qu6 b6ng va cham vfi bric tuong trong vdng 0,2 s. Tinh luc trung binh do tucmg t6c dlrng l6n qud b6ne? ,C^"" 19. " MQt qudb6ng th6p nSng 0,2 kg va cham ,roi bit" i"^"n* uol to" ad ro m/s o g6c 300 so v6i !C mat cria tucng. N6 bi bft tro lai vdi t6c dQ 6 m/s o g6c 600 so"vcyi be mai rtt"t"*gl N* o* - b6ng va ch4m v6i bric tubng trong vdng 0,5 s thi luc tiung binh do tuong t6" dung l€n qu6 b6ng ld bao nhiOu? Cfiu 50. M6t quA b?ng.niLg 1 ,0 kg va cham voi sdn nhd voi t6c d0 4 rrls cr g6c 450 so v6i b0 mpr ctra sdn. N6 bibflt tro l4i v6i t6c d0 3 m/s 6 g6c 0 so voi phuong thang armg Thoi gian qu6 b6ng va cham v6i sdn nhd la 0,84 s. Luc trung binh do siin nha tac apng tcn qia Uoig 1it S,i7N. Tinh g6c e c6 mi qud b6ng bQt ra? Ciu 51. MQt qui b6ng chdy.ndng 0,15 kg bi ndm vdi tdc do 40 m/s. Sau khi bi cAu thu d6nh b6ng d4p trung, n6 quay l4i vi tri cAu thtr ndm b6ng vdi t6c dg 50 m/s. Tfnh xung luc't6c dung l6n qu6 b6ng ? 9eTj2: Trong 2. s dAu ti6n luc t6c dgng l€n qud b6ng ndng 2 kg bicn d6i d€u tu 0 d6n 4 N. Trong I s ti6p theo lgc ndy giir gi6 tri 4 N vd giAm vA 0 trong 2 r. Xung lp. trong khod,ng thoi gian lgc t6i dgng ld bao nhi€u? Cil5J. Totg.2 s dAu ti€n luc tiic dung l6n qud b6ng n4ng 2 kg bicn d6i dAu tu 0 d€n 4 N. Trong 1 s ti6p theo lg.c ndy giir gi6 tri 4 N vd gi6m vd 0 trong 2 s. Ndu tuc AAu qud b6ng chuy6n dQng theJ truc 0x v6i t6c dO - 2 m/s thi hic lr,rc tu. ap.rg giam ioi 0 no c6 van t6c ia U"" "iierf Cf,u54. MQtnguoinhAc I !al-c6 ttrOiluong4kgl€ncao0,5m. Saudoxachvatdichuy6ntheo phucmg ngang I doan 1m. Ldy g:10m/s2. Tinh c6ng nguoi d6 da thuc hi€n? 9,"".:5. MQt ddng.co diQn cung cAp c6ng suAt tSrW cho I cAn cAu n6ng vdt l000Kg chuy€n dQng cl6u l6n cao 30m. Ldy ,g:lOm/s2. Thoi gian de thr,rc hi€n c6ng viQc d6 ld bao nhi€u? Cffu 56. MOt 6tO kh6i lugng 1000 kg chuy6n dQng v6i vdn t6c 72 km/h. Tinh dQng nang ctra 6t6 d6? CAu57.,lh9 nane cria vdt nqne,2 kg o d6y 1 gieng sAu 10m so vdi mflt d6t tai noi c6 gia t6c g:l0m/sr ld bao nhi€u khi chon g6c th6 ndng tai nl4t aAtZ CAU 58. MQt nguoi kdo m$t hom gd trucrt trdn sdn nhd bang 1 ddy hqp vdi phucrng ngang g6c 30o. Luc t6c dpng l6n day bing 150N. Tinh c6ng cira luc d6 khihom trucrr20mi CAu 59. MQt ;rdt co khoi lugng 0, i kg duqc phong thing dimg tu m4i oAt ldn cao v6i v4n t6c l0m/s. LAy g:1Om/s'. 86 qua sfc cdn. Khi v0t di duoc 8m thi dQng ndng cria vAt c6 gi6 tri bing bao nhi6u? 9au.90._MQt gdu nu6c kh6i lugng 1.0 kg dusc k6o d6u lCn.uo 5* trong kio6ng thdigian I phrit 40 gidy. LAy g:10m/sz. Tinh c6ng su6t trung binh cria luc kdo? Ciu 61. MOt v4t co ktr6i lugng 0,5 kg trugt khOng ma s6t tr€n m6t m4t phang ngang voi v4n t6c 5 m/s d6n va cham vdo m6t bric tulng thing dimg theo phuong lu6ng g6c vdi tucrng, Sau va cham v4t di nguoc tro lai theo phucrng cfi voi vAn tdc 2 rnls. Thoi gian tuong thc 1d0,2 s. Luc F Co tucmg tic dgng vdo vf,t c6 d0 lcyn la bao nhi€u? Ciu 62" Bdn mQt hon bi thdp v6i vQn tdc v vdo m6t hon bi thiry tinh nim yOn. Sau khi va cham hai hon bi cr-rng chuy6n dQng vA phfa trudc, nhrmg bi thfiy tinh c6 vdn tdc gdp 3 lAn vdn t6c cua bi th6p, kh6i lu.ng bi thdp g6p 3 l6n khOi tuqng bi thuy tinh. VQn t6c cua mdi Ui ,uu uu cham ld bao nhidu. Ciu 63 Mdt con ech kh6i lugng * ng6r d dAu mdt t6m vdn kh6i lugng M vd chiAu ddi I nim noi ",-'6n tr€:r rn{t h6. Con tich nhdy l6n t?o vdi phuong ngang mQt g6c a .Hdy xdc dinh vdn t6c ban dAu cita con 5ch sao cho khi roi xu6ng con 6ch roi dring vdo dAu kia cua t5.m v6n? Bo qua luc c6n cira nu6c. f ftu 64, MQt tOn lua g6m v6 c6 t<hOi tuqng ft10 : 4 tAn vd khi co kh6i luqng m : 2 tAn. TCn lua 5; ,,; bay v6i vdn t6c vo: 100 m/s thi phlrt ra phia sau tirc thdi khdi luqng khi noi trdn. Tinh vdn t6c ctu, ;dn lua sau khi khi phpt ra v6i gi6 thi6t v4n t6c khi ld: CSr, $5. MOt viCn dan phSo dang bay ngang voi vAn tdc v : 300m/s thi n6, vd thanh hai minh cd kh6i 'rrcrng m1 :5kg, Iilz: l5kg. Mdnh nho bay l€n theo phucrng thing drmg voi vdn tdc v1 : 400 r, : ,n/s. Hoi mAnh to bay theo phucrng ndo vdi vdn t6c bao nhi6u? 86 qua sfc cdn cria kir,\ ,F: khi. Ciu 6{r, Mqt khi cAu c6 kh6i luqng M :150 kg, treo m6t thang day kh6i lugng kh6ng d:,rii: k6, trdn thang c6 mQt nguoi khOi luqng m : 50 kg. Khi cAu dang nim y6n, ngul rt6 leo thang l6n tr€n vdi v6n t6c vs: 2 ntls eOi vOi thang. Tinh vdn tdc ctra krhi cAu vi ,i::udi eOi vOi e6t. gO qua sric cdn cria kh6ng khi. Cdu67. fui"'i chi6c thuyOn dei L :4m, kn6i luqng M: l50kg vd mQt nguoi kh6i lugng 50kg t:in thuyAn. Ban dAu thuydn vd ngudi d6u dirng ydn trOn nu6c y6n l[ng. Ngudi di v6i ':An t5c dAu ttr dAu ndy d€n dAu kia cia thuy6n. Bo qua sfc cdn ctra !,h6ng khi. Xa'" :tinh chiAu vd d0 dich chuy0n cta thuydn. Cffu 68. Tir mr)1 tdu chi6n c6 kh6i lugng M 400 t6n dang chuy6n d6ng theo phucrng ^ . .1 ngang voi vfn tt) : V - 2 mls ngucri ta bdn mQt ph6t d4i b6c v€ phia sau nghi6ng mQt g6c 300 v6i phu,or:tg ngang, vi6n d4n c6 kh6i lugng m : 50 kg vd bay v6i vfn t6c v : 400 m/s d6i voi tdu. Tinh vfln ti.rc cua thu sau khi bdn. (Bo qua suc cdn cira nudc vd kh6ng khi). Ciu 69. MQt t6n lira kh6i lugng 12 tdn duoc ph6ng thang dimg nhcr lugng khi phgt ruphia sau v6i v4n t6c y : 1 km/s trong thdi gian tucrng d6i dai. Tinh kh6i lugng khi md t6n lua dd phqt ra trong I s d6 cho tdn lua d6: a) Bay l6n r6t ch{m b) Bay l6n v6i giat6c a : 70 ^lt'. (Lhy S= 10 m/s2) Ciu 70. MQt ngucri cO kh6i lugng m1 : 50kg dang ch4y vdi vAn t6c v7: 3mls thi nhiy l6n m6t toa goong kh6i luqng mz: l50kg chAy tr€n dutrng ray nim ngang song song ngang qua ngudi d6 voi vf,n tdc v2:2ttils. Gi6 thi6t b6 qua ma s6t. Tinh v{n t6c cira toa godng sau khi nguoi do nhiy l6n, n6u ban dAu toa godng vir ngudi chuy6n dQng: a) Cung chi6u b) Nguqc chiAu C6u 71. MQt tOn lua kh6i lugng t6ng cQng m: I tdn dang chuy6n dQng theo phucrng ngang vdi v4n tdc v:200 m/s thi d6ng co ho4t dQng. Tir trong t€n lira, mQt lugng nhi€n liqu kh6i luong m1 : 100 kg ch6y vd phgt tric thcvi ra phia sau voi vdn t6c v 7 700 m/s. a) Tinh vqn t6c cria t6n lua ngay sau d6. b) Sau d6 phan dudi cira tOn lira c6 kh6i lugng ma: 100 kg t6ch ra khoi t6n lira, v6n chuy6n dQng theo hucrng cfr vdi v$n t6c giAm con 1/3. Tinh vAn t6c phdn con lai cria t6n ltra. Chu 72. MQt vi6n dgn ph6o dang bay ngang v6i v4n t6c vo : 25 mls o dQ cao h : 80 m thi n6, vd lirm hai mAnh, minh I c6 khdi lugng m1 : 2,5 kg, minh hai co r/Iz: 1,5 kg. Mdnh m6t bay thing dimg xu6ng dudi vdr rcyi ch4m d6t vOi vQn t6c vi : 90m/s. Xdc dinh dg lcm vd hudng v6n t6c ctra mdnh thri hai ngay sau khi d4n n6. gO qua sric cAn cira kh6ng L ti. Lhy g : 10m/s. a ^f ,4 t : Cf;u 73. MQt vi6n dan kh6i lugng l0 g dang bay voi v6n t6c 600 m/s thi gap m6t bric tuong. Ean xuy€n qua tudrng trong thdi giur, ;!s. Sau khi xuy€n qua tudrng, v6n t6c cria clan con 200 m/s. I 000 Tinh luc cAn cria tucrng t6c dung l€n d4n. cfru 74. Mdt qud b6ng khdi lucrng m - 200 g, dang bay v6i vpn t6c v : 20 m/s thi dpp vdo bric tuong thing dimg theo phuong nghiOng m6t g6c a so v6i mdt tucrng. , Bi€t ring v6n t6c cira qua b6ng ngay sau khi b{t tro lai ld v' :20 nls vd cfrng nghidng vdi tunng mQt g6c a. Tim dQ bicn thiOn dQng luong cua qud b6ng vd luc trung binh do b6ng t6c dung l6n tubng n€u thdi gian va ch4m la a/=0,5s. X6t trucrng hgp: a) a=300 b) a =900 Ciu 75. T?i thdi di6m ban ciAu, mQt t6n lira kh6i lucmg M c6 vdn t6c v. Cho bi6t cu cuji m6i giay c6 mOt t<trOi lucrrg khi thodt ra khoi tOn hia ld m vd vdn t6c cua khi tho6t ra sai kh6c v6i v4n tO."t6n lua m6t lugn8 u. H6y x6c dinh vAn t6c tdn lua sau n gidy, bo qua inh hucrng cia trong luc. Cfru76.MQtqudcAunh9ddnh6ichuy6nd6nggiirahait6mthdplcrrrd4t song song vdi nhau. MQt trong hai t6m th6p d6 nim c6 dinh, con tAm thu rrR hai chuy6n dQng voi vdn toc u huong tdi t6m thri nhAt. Nang lucrng cria Y qui cAu s€ tdng bao nhi0u Yo saun lAn va cham v6i t6m thdp chuyOn agng I ^, n6u ban dAu no c6 vin t5c v (v > u) vd chuy,3n d6ng vudng goc vdi tAm I , 1 thdp nhu hinh v6. Bo qua su thay AOi van t6c cua qud cAu do t6c dung cua - trong luc. Ciu 77. Thd mQt con lic don chuyiSn d6ng tq do tu vi tri md d6y hqp v6i phumg tling drmg mQt goe a. Tim v4n t6c cira con l6c o di6m th6pnh6t vd mQt di0m ddy hqp v6i phuong thing dimg mQt goc p < a . cffu 78. Mqt qui cAu thir nrr6t m5i lugng m ldn trcn m6t doan duong th6ng nim ngang v6i vdn t6c v. Eo4n dudng ndy duoc n6i v6i m6t doqn dOc rOi n6i vdi mdt doan ducrng thdne kh6c c6 dAt m6r qua cAu thu hai dimg y0n thOi tuqng M, hai doan c6 dQ cao ch6nh nhau ldr H. Hdi v6n t6c ban dAu cria qu6 cAu thri nh6t ta bao nhi0u d6 sau khi va ch4m tuyet d6i , l. " l dan h6i v6i qud cAu thri hai n6 l4i leo l€n d6c dd tro vd doan ducrng c6 d0 cao H. Bo qua ma s6t. CAU 79. M6t xe 16n nho khdi luqng m = 5 kg chay tr6n ducmg ray tu trang th6i nghi, thopt dAu tr6n m6t doan nim ngang BC =lm, sau d6 theo mQt ducrng cong CD l6n cao. Xe chiu t6c dgng cua mdt luc kh6ng d6i ,F =120N cung chidu vdi chuy6n dQng. a) Tfnh dQng ndng cta xe tai di6m C. b) Tim dQ cao cuc dqi h so v6i m{t phang nim ngang mir xe d4t t6i ntiu bo qua ma s6t. c) Vi c6 luc ma sdt n€n xe chi dpt tdi dO cao h' = 1,8 m . Tinh c6ng cria luc ma s6t. i-':iu80. Hai vQt A vd B co kh6i luong ffit=ffi2=6kgn5i vOi nhau bing mQt sgi dAy c6 khdi i.r'rng kh6ng dring k€ vit qua mOt rdng roc nhu hinh v€. Vat A d trOn mqt phang nghi€ng d =3A" IJ s,' vdi phucrng ndm ngang. Tinh cdng cria trong lgc cua hQ v4t khi v{t A di chuyCn trdn mdt phdng r,1rhi€ng ducyc m6t quang ducrng (.=2m vd v6n t6c cria m6i v4t khi ci'i 86 qua ma sfi,l|y g = 10 *lt' . (-;\rr 81. Cho hC nhu hinh vE (bai tr6n) a, =30o , w,' 7509, m, = 1009 chuyi5n dQng kh6ng van t6c dAu. H€ s6 ma sdt giir:: r'6t m, vd mflt phing nghiOng ld. trt=0,15. Dirng dinh ludt b6o todn ,'iing lugng tinh gia t6c m5i v4t vd suy ra v4n t6c m5i vat sau khi chuy6n dQng mQt thdi gian t=4; CAuS.\." V4t trucrt tt dinh d6c xu6ng mat phing nghi€ng AB vdi goc nghiOng a=30o so vcri ': phucmg ,-im ngang," sau d6 ti€p tuc chuydn d6ng theo phuong ndm ngang BC. BiCt hQ s6 ma s6t gita v4t r;iri m{t phdng nghiOng vi mdt phang ngang ld nhu nhau vd bltng p =0,1, AH =h=lm. Tinh vdn ,.r: cira vdt tai B vd qudng duong di ducv. c trdn mdt phdng ngang BC. m Ciu 83. MQt sr,,,i ddy cimg vd m6nh dugc u6n gdp thdnh hai doan vu6ng goc vdi nhau vd,'ir.roc giir cO Ainn sao cho mQt doan nim thang dimg vd m6t doan nim ngang. Tr€n x' I ' r'r ii mQt 6ng nh6 khOi luqng m. Cdc 6ng dugc n6i vdi nhau bdng m6t thanh cirng mol doan co tong t{ nhg chi€u dai L, thanh li6n kOt vdi c6c 6ng bing bAn 16 nhu hinh v€. Ban dAu thanh dugc giir gAn nhu thing dimg sau d6 t6c dgng mQt kich thich nhg d6 c6c 6ng vd thanh tA bit d6u chuy,Sn dQng. Bo qua ma sdt, hdy tim v4n tdc cpc dpi cira m5i 6ng. Cffu 84. MQt vi6n bi kh6i lugng m ldn kh6ng v6n t6c dAu kh6ng ma s6t tir di€m A c6 d0 cao h dgc theo mQt dutrng cong n6i v6i mQt hinh tron b6n cho OM t4o vdi phucrng thdng dimg mQt goc d nhu hinh v6. Tim gi6 tri nho nh6t cua h d6 vi6n bi vugi qua vdng trdn. CAu85. Cho hp 2 vQt mr:3kg,mr=2kg m6c qua mQt rong roc nhu hinh vC sao cho m, cdch mdt dAt mQt d0 cao h=lm. Tinh vf,n t6c ctn2 vQt khi m, chamddt va dQ cao nhAt md m2 eo th0 len dugc. Ciu 86. Cho hQ nhu hinh v€, v6t co kh6i lugng m=2kg, g6c a=3A0, I6y g =I\m I s', luc k6o F c6 phucrng ngang rdng roc co khdi lugng khdng dang ke. Tinh F dg lcrn cua luc F vdluc cdng cua ddy. Ciu 87. MQt thanh AB c6 kh6i lugng m - 4kg ddi / = 60cm ducvc treo nim ngang nho hai sqi d6y ddi d-50cm. Tinh luc cdng cria ddy vd lqc n6n cira thanh trong mdi trucrng hqp. (Hinh 86) d Cffu 88. Thanh BC c6 khdi tuong m: 6 kg , dAu C nim tr€n sdn, ddy AB c6 phucrng ngang, g6c a = 600. 1) Tim c6c luc t6c dung lOn thanh. l. 2) HQ sd ma s6t gifra thanh vd sdn h +. Tim di6u ki0n goc a d6 2 thanh nim cAn bing (dAy lu6n c6 phuong ngang). CAu 89. MOt chiec thang AB nang 10\6 kg tr,ra vdo tucrng vi hqp v6i sdn nhd mdt goc d = 600 . Gia su ma s6t giira thang vd tucrng kh6ng dang k6, gita thang vd sdn c6 ma s6t. Tim c6c luc t6c dung l€n thang. Ciu 90. MQt khAu sring d4i b6c nim ngang kh6i luqng m, : 1000 kg, b8n m6t vi€n dan kh6i lugng tn6:2,5 kg. Van t6c vi€n d4n khi ra khoi ndng sring ld v6 : 600 m/s. Tim v6n t6c cria s&ng. Cf,u 91. Hai toa tAu chuyOn dQng nguqc chi6u c6 vAn t6c ld yr:4mls vd yz: -6 nrls, kh6i lugng tucmg ung ld Iilr : 15 t6n vd m2:20 t6n. Tinh vdn t6c hai xe sau khi chring mic vdo nhau. cau 92. M6t xe c6 khdi lugng m1 : 80 kg cho m6t ngucri co kh6i lugng m2 : 50 kg, xe dang chuy6n dQng vdi vdn tdc v : 3 m/s thi nguoi nhdy rakhoi xe. Bi6t v?n tOc ntray AOI vOi xe ld vs : 4 m/s. Tinh vAn t6c ctra xe sau khi nguoi 6y nh6y: a) Cung chiAu chuy6n d6ng cria xe. b) Nguqc chiOu chuy6n d6ng cira xe. Ciu 93. MQt hon bi c6 kh6i lugng nl1 : 0,1 kg chuy6n ddng vcri vdn tdc v1 : l0 m/s dtin va cham vdo mdt hon bi thri hai co kh6i lugng tr12:0,2 kg. Sau va cham, hon bi thri nhdt chuy6n d6ng nguoc chiAu ban dAu vcyi vi = 5ml s . Hoi chuy6n d6ng cua vidn bi thri hai? Cf,u 94. MQt vi6n d4n c6 kh6i luqng m=3kgd,ang bay thdng dimg ldn tren v6i v4n t6c v =100mls thi bi n6 ra ldm hai mAnh. M6nh thri nh6t va thf hai chuy6n dQng hqp v6i phucrng thing dimg l6n lucrt c6c goe d = 300 vit p = 6go . a) H6i kh6i lugng cta cdc mdLnh. Bii5t mAnh thri nhAt c6 vAn t6c v, = 7 5Jjm I s . b) Hoi v4n t6c ctra minh thri hai. Cffu 95. Hai nguoi trugt bang co khOi luqng 65 kg vd 40 kg, dimg tr6n m{t bang cAm hai dAu cua m6t c6i sdo ddi 10 m, co kh6i lugng kh6ng d6ng k€. Hai nguoi bat Oiu kdo d6 ti6n lai gAn nhau cho d6n khi ho ch4m nhau. Hoi ngudi 40 kg dd chuy6n d6ng bao xa. Cffu 96. M6t qu6 bong d6 c6 kh6i lugng 400 g, chuy6n ddng v6i v4n t6c l0 m/s tr6n m6r sdn nim ngang d6n va cham vdo bric tudng thang dimg theo phucrng hqp vdi tucrng m6t g6c 000. gi6t ttrOi gian va cham cita bong v6i tucrng ld 0,005s. Tim d0 l6n lgc tucrng tdc cira b6ng vd tucrng. Ciu 97. Dung m6t luc F:ION hqp vdi phucmg ngang m6t g6c a = 6A0 Ae teo mQt v{t cO kh6i lugng m:1kg. Tinh c6ng md luc dd thgc hi€n khi v4t d4t duoc vdn t6c v:2 m/s, ciu 98. Treo mdt vflt nflng viro mQt sqi ddy ddi l:50cm . Hoi phii truydn cho v4t v4n tdc t6i thi6u bing bao nhi6u tai di6m th6p nhAt A dd vat c6 th€ quay trdn trong mdt phang thing dimg. Ciu 99. MQt quA lUu dan duoc n6m ra vdr khi n6 c6 vdn t6c 10 m/s thi n6 thdnh hai minh. Manh l6n, chi6m 60% kjrrdi luqng cria qud lgu d4n, tirip tpc bay theo huong cfi nhrmg vdi vfln t6c 25 m/s. X6c dinh v{n t6c ctra m6nh thir hai. cau 100. MQt v4t khoi lucrng m:2kg rcvi tir d6 cao h=40cm xu6ng m6t lo xo c6 dQ crmg k:1960N/m. Tim d6 ndn t6i da c[ra ld xo. I' . lgc N tien quang ducrng dni 3( m). Tt d6, suy ra cdng cua luc ma s6t. Cku32. Vi6n dan khoi luqng 100 g dang bay ngang v6i vAn t6c kh6ng d6i 100 m/s. a' Vi6n dan d6n^xuydn. space (3d-40) given on your answer sheet: Question 36 . we/ now/faced/ problems/ environment. Question 37 . erosion/ soil/ result/ when / forests/ cut/ carelessly. Question 38 . polluted/. kioi tnqng 6 kg. X6c dinh lgc ndn l€n hai gi6 dd. Ciu 23. Vft d4ng trp, kh6i lugng m: 100 kg, b6n kinh R: 10cm. Bu6c vdo v6t m6t sqi 06y ngang c6 phucmg di qua tdm