ng nhfln. d.uo.[r]
(1)Di rnr HQC rci z' NAvr n-Q^c zol3;3014
MoN: vAT r,{' xnol 10 c0 BAN
Tltdi gian: 45 Phtitt , t Cffu 1: (1,5rti6m) DiAn vio ch6 trpoe ronsia" 9ay iau Ae tnann nQi dung dfing (trotg gi6v bdi
tim, c6c ,rn khoniril ;ili;; a5-uEi, "t ita" ghi cuT tir c\.oiA.n tucrnqlns vdi m6i cdu) ' " rniOt vflt dang "t"y6"
AQne thl vec-to dQns lugng cria n6 c6 hudng
b Darlg ning lugng-ma rnQt vQt c6 dugc Oo nO dang chuyiSn" dQng gqi ld'
c Khi mqt v4t rh";A;6il ffong trgng trubng crla trQng 1qc thi co ndng ctra vflt la m6t dai luqng b6o todn (
J 'po*g Aan"g tich hq tqra d0 Q,T) c6 d4ng |a.:"'
e DQng co nhiQt ; .l,uy[i tiOa tat
"a nniet luo ng nhfln
d.uo c thdnh
g pbtE ndng ctia v$t: , n6u luc t6c dung vio vQt sinh c6ng
:l),il Jfu: ffiT}6 .unu trulng hqp t6ng quat r Khi ndo thi cong cria mQt lu-c c6 si'6 tri
duong? Khi nlo thi cdng cria mQt lgc c6 c6ng 6m ?
b COng cria ngga k6o xe vd eria xe k6o ngga li cOng duong hay 6m ?
c Khi k6o vflt tr€n mot do?n dulng s nh6t dinh, git cho c6ng A khdng thay d6i vi mu6n gi6m
luc k6o thi cdn"chri f diAu gi ?
^ *!^ - t-!^
c6u 3: 1t,5 diem) MQt xy-ranh c6 pirtong d6ng kin chrla mot khoi khi e nhiQt dQ270c,6p su6t I atm
a) N*ng n6ng t<troi ttri o6n nhiQt 870C thi th6 tich t6ng 1,5 lan so v6i lirc dau' Tinh 6p
su6t crin kh6i xy-lanh lirc t16' 7 .; r z -c ^t
b) Ngay tirc niy ta git nhioti6'*r' C khdng d.i, ta gi6m th6 tich chAt di 1,5 lAn thi ao urlit"'Jvuffii il; rrav 6ao nhi6u?
e[ffi 6;;ili;ffi*ht; h;c crng bA rnat? vi6t cong thric'
cfiu 5:
-$ilt-r'ffifl,bi€u thric nguy.n ri I nhiQt dong rsc hsc (quv u6c d6u.tr9ns uicu rruic ;
,dffii;Qt hsng khi Ii tuong hg thric Lu = Q ,Q>0 diSn t6 qu6 trinh ndo ?
-AD: nguli ta truy6npno mrOi-ttrit ong mqt xilanh mqt-ntrlft.lu*ng Q:250J lim cho kh6i rhuc hien cong A: 150i ;afft [ di Nqi n6ng cfia kh6i t16 tang hav giim bao nhi6u?
Cflu 6: (1,5 tti6m)
MOt ld xo c6 krroi luqng ktrong dang k€ ilugc treo thigs dung gJ3"g th6i ban dau kh6ng bi
bi€n dang M6c ,a" aa,iJ"oi ltra [";;;ilrat oo ffiuqnE 560.sit i ro xo'd6n
raZ,&cm'Ldv B: 10m/s'
u fi*, etQ.ctmg cria ld-xo?
b: Tinh th6 n[ng ttdn hbi cria ld xo n6 d6n raZ'9cm? .x -.^.,
ltrTfi:ilT-1*iffi t#,11x"#Ji&1J]?,iilfr ,ffi:ili]i:,.homQ,v41kh6i
rusng 500 g trust kh.ng ma sdt, fi;;;; tit oA,,' ti6t aT' nghie"g dai 10 1r' 8:
10 rn/s2'
a.Tinh c$ng ctra sdelpc t6c dgng 10n vflt'