Nhờ Thầy , cô giúp câu 30&48

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Q
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{rsl.
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{MHz).
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chgc
m€gahec
(MHz).
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Q
thugc
cpc
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D.P,
Q
thufu
cr,rc
ti6u.
C.0.J
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D.25
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6 mls.
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m/s.
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{MH;),
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{kHz}"
Cf,u 4:I4$t
ingten
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phrit
ra
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ddn
mdt vAt
dang

chuydn
dong
vi phia
rada.
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gian
tir
lic dngren phdt
sdngddn
ldc nhgn
sdng
ph6n
x4
rrd
tli
li B0
(psi.
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pi,,iiAo
tffiffi,il;
gian
tu
lfic ph:ir
song
ddnoden.hicrhqn-s6ngphin
xa
lin
niy
re
zgirLs).gigi16.

a0
-;;;il;;;
trong
kh6ng
khi
bing
-1.108
(m/s).
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d6
trung
binh
crla v6t
li
S.
2,5
mA.
8.4 m/s.
S. ,lr(s).
n.
{rrt.
4"
C$u 5:
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m{t
nu*c
cd
hai ngudn
sdng
gi6ng

nh*u
A vi
B,
ciich
nhau
khoang
12
(crn)
dang
dao
dgng
vudng goc.uT
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tqo ra
sdng cd
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sdng
I cm.
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li di6m
kerimit
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re?f,
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j1ri
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vi cdch
trung
di€rn

o crla
AB
m$t kho&ng
I
(cnr),
s6
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vusng
pha
u*i ngubn
J tra,,
doan
CO li
A. 10.
8.6.
C, T.
D. e.
Csu
6:
D6 truy,ln
cdc tin
hi0u truyin hinh
v0
triydn,
ngucri
ta
thwting
dirng
cdc

s6ng
dign
rir cd
r6n
sd viio
khodng
Ciu
7: M$t v*i
dao
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diiu
hdn tr€n
qu!
daa
li
rngt
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l0
cm.
lihi
v3t
e6 rdc
rtg
t0
cmls
thi
dO ldn
gia

rdc
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cm/s?.Chu
ki dan dgng
l*
c.
fr,l.
ilAu
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hai diu
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n6i
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chidu
cd
dn sii
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50
Hz rhi
doan
mph
cd c&nr
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hing
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rip
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bing
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Page
1
CAu
9: Tia
t* ngoai
dugc
phdt
ra
rdt
manh
tir
A. rnin
hinh
v0
tu5rdrr.
-
B.
h$
quang
di$n.
{1.
lb

vi
srlng,
D- lft sud'i
di$n.
Ciu
l0: Dg4n
mach
AB
gdm
m6t
d6ng
co
di-en
ric n6i
tiilp
voi m6t tudn
ddy. Khi
dqt
vlo
hai
I
'
mgr
dign
dp xoay
chidu
thi
diQn dp hai diu
dgng
cr

som
pha
3so
v6i d$ng diQn vh cd
gid
tr!
hi$*
,:
lI U, flign
dp
hai diu cugn
day sfm
pha
I
so
raitilrrg
di$n
vh cd
gi6
tri hi$u
dpng
1i
u.,6
'
ni4rr
hi6u dlrng
git}a
hai
ci6n
dopn

mqch
AB li
A.
U"fr,
3. u"6.
C,
U"if
.
D. U,f;,
Ciu
11:
S{$t
con l*c
Id xo
dao d$ng
diAu
hai
theo
phumg
thang drng,
t*}q,blnlt
cf
.mdi.phrit
vit
thvrr
hi6n
dusc
240 dao
<10ng toirn
ptrin.

Trong
qud
trinh
dao
LlQng,
ld
xo cd
chi€u dli
nhd nhdt
lh
50
crr.
ctriiu
Oal
tm
nhdr lI 6b
im. Chbn
gdc
rqa
d0b
vi
tri cin
bing;
chi6u
duong cria
truc
toq d6 hu6ng
xu6ng
dudi.
g6c

thbi
gian
lir h1c lo
xo c6
chiiu
dii
nhd
nhit.
Phurng
trinh
vin
tdc
cria
vAt
th
A. i,=40nsin{&n+r}(cm/s).
B. v=40nsin8;r{cn/s)'
C.
y
=
4Onccs8ru
(crn/s).
D.
v
=
$Onsin8m
{crn/s)'
Cf,u
1l: Trong b6n
brtc

xp
hdng
ngn{,
tu ngoqi,
Roa-giren
v} gammn, birc xg cd
tin
sO
r*O drdt lh
bire
x4
A.
gamma.
B. hting
ngoqi.
C.
t&
ngo$'
D' R.m-ghen
Cfiu 13:
frCIn
m[r
nuSc
cd hai
nguin
k{t hqp
A,
F
ciich
nhau 30 tm,

dao
d$ng
theo
phuung thing
drnrg, c6
phucrng
trinh:
uo
=
lgsin(40;rr
+
Il
**l
ur
=
Scos(40nt)
mm.
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tr€n
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mpt
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ch*
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=
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cqc
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4.5.
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trung ttm
l)
4.4,8 nurt
A. 1,600
s .
B. 80 *.
B,
3
rnm.
B.
2,200 s.
c,1?0(}.
c.6.
C.
2,4 mnl
C.
1,436 s.
D.
r6011.

p.4"
D.4 mm.
D. 1,214 s.
C*u
14:
Trong
thi
nghi$m
lfl4g
{Yaung)
vA
gia,:
:iraa
inh
sdng,
k}o*ng ctuh
gi'.ra
hai khe
l}
1,? rnn:,
Khoing
c{ctr
tfi hai
lbe
A6n fr*n
quan'sdt tl
Z
m, Chi€u
vio
hri khe

ddng thoi
hai bfic x1
r1o'n sic
X,
=
A,4S/-rnve
4
=
0,6{pn
.
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cfch
ngin
nhit
gl*a hai vin sdng c6 cirng
rnhu so vui
v$n
sing
C6u
15:
Mqt s6ng
ngang truy&n
rong
m$t
rndi truong
e6
phuong trinh u
=
tJ66os2r(ft
-

{
).
niit
u+n
n
rdc cyc d4i
crla ctrg
ddng cria
phin tri
mdt
trulng
gdp
a lin
rdc d0 truyin s6ng'
H0 thr?c nio
du6'i
div
ll
dfrng?
i. r-*
B.
L=lrUc.
C'
l=2nUo^
D. l=3$.
4'
2
C6u 16:
M$t
corr

lic d,m tlao
d$ng
nh6
c6
chu
ki
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1'9g6
s' Tich
iliqn
hm cho
v{t vh cho con
ldc clao
dqng hong
mqr
difn l.rudng
dCIu ce
pnutmg
thnng
durrg
hudng xuiing
du6i
tht
thdy
chr: l<i
'{=:qNiu
Oaoif,i6uiien
rubng
vh
gi*

nguyen
d8
ldn
cria
cucng
rlq
diqn truring thi chu kl dao
d$ng msi
crla
con
l3C la
Cfiu
1T: Eoirn mpch
RLC kh$ng
ph$n
nlidnh
mdc
vi.o mpng
di$n rAn sri
gdc
rrlrthi cim
khring
lh 30'O
vh
tiung
khdng
li
90A,
Niiu
n ec

ulo
mgng
dign
c6
tin s'3
gdc
o1
=
600
(rad/s)
rhl
cu&rrg
d$
dnng diQn
ctng pha
vdi dipn
r4p
& hai dAu dopn mach'
OiA
tri
q
la
A.200(rad/s).
S.
1800(ra#s)'
C. ?00",6(rid/t'
D' 600"-fi
{radls}'
TRUNG I{eC
pHfl

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LAN
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thi35?
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:
http
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Page 2
CSu
l8t
Phrit
bidu
nAo
sau

d6y khdng
dring?
A. ciic
vecto[E
trong
sdng
difn
rri
lu6n
vu6ng g6c
vdi
nhau
v]
dao
dQng
nguo.
c
pha
nhau.
.
It'
Khi.n$t
ty
ro*e
biiin
thitn theo
thoi
gian
thl
nd sinh

ra
mqt
dign
tru*g
nne
e6c
dutrng
sr?c Ii
nllrng
duong
khfp
kfn
bao. quanh
c6c duong
c6m
fng
nr.
I
I :?19
di€n
li
khdng
hAp
rh! ho6c phin
ia cdc
s6ig
(di€n
rir)
cpc
ngin.

D.
Khdng
ths c6
di€n
rrulng
hogc til
trusng
t*n t4i
ri0ng
bigr, aoc
rai
uJi
nhu*.
Ctiu 19:
Chqn
phdr
bi6u
kh6ng
dring
kni n6i vA sdng
im?
*.y1
toc
tmydn
ary
nhy
rhu6c
rfnh
din
hdi

va
fh6i
tu.qng
ri€ng
cria
mdi
kuo.ng.
B.
s6ng
am
truy€n
to'i
di6rn
nio
rrong
kh6ng
khi thi
phAn
u
H,o-ng
l$i
rai dd
sEiao
d6ng
rheo
phuong
wdng goc
vdi
phuong
truydn

sdng.
.
c.
s6ng im
nghe
drru.
c
c6. tin
s6 nim
trong
khoang rri
r
6 Hz d6n
z0
000
Hz.
s. sdng
im
1) sil
lan
tmyin
c6c
dao dgng
co rrong
m6i
trucng
khi,
I6ng,
rin.
C$*

20:
M4ch di€n gdm
diOn
trs
R
=30\5O
nni rldp
voi
t9
didn
a-*r.
Sifn
dp tfic
rhsi
&
hai
d6x
doan
mpch
li
u
=
r20r6cos
r00nr
{v)
. }0ng
di€n
rrong
dagn
maeh

cd
bidu
thric
A.
i
=
?.lTcns(roonr
+f
i
(Ai,
c.
i
=
3.,ffcosiroorr
+fl
{A).
E.
i
=
?.lTcos{l
oonr
+{)
{Al.
D. i
=
3.fircsitooar+{t
{a).
csu 21:
Mdt
con

lic
don
trao
dgng.vai
c}1fi
z s, o,6
*uq
tri
elao
dgng
cia
nd,
nguoi
ta
dtng
m{t
hg co
hqc
c6
hi{u
sufi 209o
vh
cdng
suii+
mw.
cdng
cte tpc
can tara1,irgl?".r"ie-
khi v4r
n{ng

di
rir
vi
rri
bi€n
vd vi
ki
cin
bing
ii
A"
-
0,4
mJ.
B.
-
0,8 mJ.
C.0,4
rnJ.
D.0,8
mJ.
c6u
?3:
M$t
con
lic
l0 xo
dang
dao
d$ng di3u

hiarheo
phu!|s
ngang.
Khi vit
n{ng
c0a
con
l*c di qga
vi
tri
cf;n
b{ng
thi n6
va
ch4m
"a.Omft
varinrOt
v{t
nhd
Cang
ddg ye".?*
i*
A.
hiOn
dg dao
dong
cria
conric
tdng.
I iSrsl,iu*c.{ro

a-one.iu
"on
l** ,nng.
c. ch*
ki
dao ddng
cta ccn
lic
gi6m.
Il,
rin
iii aanigng
.,iutn
Hc giirn.
cffu 23;
I*rdt
bi6u
lio
sau day
th
gai?
Tiong
qua
rrintr
rtuyen
ui
dign
nang
di
xa,

cong
suiihao phi
A. ti
ld voi
bi$ phuong
cOng
suit
nuyen
di.
B.
ri 16 vsichieu
diiduong
diy raididn.
,:;|l,S,& .
!. { li
ogr'i1rr
"*i
J#
l1,l-'*g
d'en af
grra
hai
oiu ddy
d h?m ph&
dien.
Ci
sljl-i-_:\
7
o.
ti I€

vdi
thoigan
n-uyBn
di€n.
,i ,.r"$.W'"'-
Cfiu
24:
Eidu
kign oii
rhu
dugc
quang
nhd
vach
hdp
fig
li
-;^'o."'
A.6p
suitcria
khdi
khiphai
rit ttip.
B. nhi€t
d0 cia
d;trn
khi hay
hoi hdp
thg
phni

cao hon
nhigt
db
c*a
ngu6n
phdr
quang
ph6
lign ruc.
C,
khdng
cin
didu
ki€n gi.
"o-"-'r""-'
r).
nhi€t
dd
ctia
ddrn
khi hay
hoi hdp thu phsi
th{p
hrn nhigt
dg
cria
ngu6n
phdt
quang
phd

lien
tgc.
Si: 1,L,,Io:.thi
\tg
rnri.ng.
bing.rhuv.tinh,
gidi
han
bdi
hai
mrt
.au
io; gi6ng
nhau
ban
krnh
30
cm.
uret
chidt
sufit
cta
rhrlv rinh
ddi
vili
ria
d6
lh
na
=

1,50 vi
O6i vOt
tia tim
li n,
=i,5+.
Khoang
cdch giira
ti6u
didm
d6i vdi
tia ai
va
tieu itdm
o;i
,iitt.i*;;ffi;il';;lu""'
'" "'
A.
1,92
cn.
*,2,22cm.
C.
l,9Z
mm.
D.
Z,??
mm.
C$'26:
Hai con
tic
do.n,,o::.u:"g,1:l:

hd?
*ii.::q.Tgt
noi
rr*n
Trr{i
S6t v$i
crng
mgt
cu nang,
Khdi
lugag qui
n{ng
cia
con
lic
thir nh6t lon gfp
ua t<n6i
lu'gng
qui
n6ng.,lu
.on
lnc
rhi,
hai
{rnr
=
3m:).
ChiAu
dli
dfly treo

con
llc
rhri
nh{t bing
mgt
nri*
chiiu
dii
dfiy
rre
o con
ldc rhir
hai
(
,,
=
I,
Quan
hi
gita
bi€n
dd gdc
cria
haicon
l6c
Ii
TRUNG
HqC
PIIO
THONG

CHL]YEN
DI{
SPTiA
NQI
-
TIII
Ti{U
I)AI
ITQC
LAN
2 NEM
20I3
Trang
3fr
-
lHs dA
rhiJ5?
S wu
iim
:
http
://vuphan62
hn.violet.vn/
Page
3
A.q
=1,5ar.
B.q
=
,{#o,

C.
a,=la, O.
q
=rfq.
'3
V3'
Cfiu 3?r D*t
ffi*l di$n Sp u
=
1?0$cos100x'r
(V)
vio hai
diu m$t Ooan m4ch
cS
&L,C
mic
r',
li
Bidt R

50 ft
,
dd
lf
ch pha
gifa
di€n ip
o hai
diu
doSn

mach
vi
cucrng dd ddng C:0n lrong macl,
,
Cong
su6t
ti€u thr.i cua
doan nrach
li
A. 86.4 W,
B,
458
W.
c.
:16
W.
D.
648
W.
CSu 28: Dopn mgch
clign xoay,chilu RLC
mic
ndi
ti6p
dang cd tinh cdm khr{ng.
Khi ting din
*r
I
crir
dbng di€n

thi he s0 cdng
suAt
cta m4ch
.4-
giim. i.ling
O,
C.
t5ng,
D. khOng
d$i'
CAu 29:
Thyc hiQn
thf
nghigm
l3ng
vA
giao
thoa
d*h
sdng.
Kha*ng e6ch
gita
hai kire
II I mn, mln
qur
sdt dqr sang
song
vui ngt phaog.!,'ir
hri
khe

vi cdch
hai
khe
2 m. Chiiiu
sdng
hai khe bing
rlnh.sri: .
tring cd
f:r*c song 0"400
pnr
S
I
<
0,?50
pm. Budc
sdng
lox
nhit
eia cdc birc xa
cho
vln
t6i
rgi
didm
\
tr€n
min,
cdch
vdn
lrung $m 12 m:n,

l$
A.0,635
;irn"
B. 0,735
pm.
C.
0,685
pm
. D.
0,705
pn.
Cf,u
30: illt nQt
diqn dp
ry
=
L/ocas{c})
,
trong dd
Ug
khi-]ng
dOi nhung o thay
ddi durc*
vic
}rai
tliu
doan
m4ch
g6m
dign tr*R

=
60 O, cuQn
cin
thuinL
vtr
tr,r
diQn C
mic
nffi *dp. Khi
a=
E
thi
cubng d$ ddng
di€n
hiQu
dqng tong
m4ch
cgc
dpi
vi
bing
I*"
Khi o*
q hogc
4r
=
tr4thi
cuong dQ rlirng diOn higu
durrg
rong mach

bing n|au
vI
bing
!
. Si6t
E-
a;=l
204
(rad/s).
Gi6
t'i cila
dQ tp cdm
L bing
"2
.fi
A.
:lt.
2tr
r
c.
lls.
1-
I
B.
:*I{.
Ltt
'
D.
:H.
t

Ciu
31: Hai con lic dnn
llrn bing hai hln
bi
cd
h;trn kinir lring
nhsu,
treo tr*n hai *gi diy
cd cung d$
dii. Hai h&n
bi cd khdi
lucrng khiic nhau.
Hai
con lic
dat d6ng trCIng
rn$t m0i truung
vdi
li
dq
gdc
brn
diu *,'.r
nhau vi vin tdc ban di';
diu bing 0. Fhdr
breu
nI;
slru
ddy dung?
A. BiBn dQ
ctia hai

con lic
gi6m
theo
thoi
gian vdi
t5c
d0
nhu
nharr.
$. Con
lic nhg rnt d6n nhanh ho'n.
C, Bi0n
d9 cria
con
lic nhg
gidm chgm hsn
bi€n d$
*lia con lic n$ng.
D.
Csn l{c
nqng
t5c
din nhanh
hm.
Cdu
32:
Hai
dao dgng diAu hoi
cing
phumg, eirng

tAn
sd
cd
phunng
trinh
x,=A,cos(rot-ff
ta
xr= Arcos{crtt-fi)
c,n, Dao
dgng tdng
hqp
cd
phuoxg lrinh
x
=
9
cn*i*x+tp)
crn. Ei biin d0
Ar
c6
gi{
tri
cr,rc
dqi thi .4,1 cd
gid
trj
A.9.,6cm. B.
?cm
C.1816cm. D. 15.6rm.
CSu.33:

Lucmg ndng
luq:rg rn} sring
im
\uy8n
qua rtr$t dan
vi
dipn tich d{t
vt$ng
goc vdi
phuong
truyin trong mQt don
vi
thdi
girn
cd
gid
tri
bdng
A. d$ to
c0a im.
B,
11$ cao cta
im.
C. cr:bng
dq
dm. D. mrlc
crcng dg
0m.
CAu
34: Ihf nghigm

giao
thoa
dnh
sdng
cd
bu6c.sdng
I
hai
khe
I-Lng
c{clr nhau 3
mm.Hipn
hro.ng
giao
t}roa
dugc quan
sit
r6n m6t
nran
song song
vdi hai
khe vi c{ch hgi irhe
m$t
khsang D.
N6u ta dsi
mhn ra
xa
thCm 0,6
ra rhi khoing
vfin tang th€m

O,te
rnm.
Budc
sd,ng
)" bing
4.0,a5
pm.
8.0,72"
pm. C.0,60
gn.
D.0,64
pm.
Ciu 35:
Chqn
phdt
bi6u drlng?
,
r';-;
g
A.
Chi cd
ddng di6n ba
ph"a
rnoi
tso ra
duoc
rir rulng
qnay.
4|.'iit1."I'S':I"'"
'

B. Rdto
cia
dgng co khdng
ddng b0
quay
vdi
tdc dQ
gtic
cia
tt truong
quay-
ki"rir.td
'"
C.
Vecto
cim ung til crla
tt trxottg
q,tuy
lu0n
thay d6i
cA
vO
hroxg lfin
tri si5.
-a/\:;'-
TRU]'"IG
FIOC PH6 THONG CI{UYSN
OH SP
H.I, NOI
*

THI TH*' DAI HqC I-iN ? NIM ?OI3
Trang 4ff
-
Mfi
{} thi 35?
S wu
t dm
:
http ://vuphan62hn.violet.vn/
Page
4
n.
T$c
d$
g6c
cira
d$ng
co liirdng d6ng bd
pbg
thu$c vin
tdc dg quay
cria
tir tnrrng
vl
r*o
momen
cdn.
CAu 36.1 Ch.on
phdt
bi€u

drSng?
A. Tia
h6ng
ngcgi vi tia
tri ngoai cd ban chit khdc
nhau.
B.
Chi cd tia
h0ng
{rgo?i
IA c6 $c dung nhidt, cdn
tia
hr ngoai
rhi kh6ng
C, Tdn
s6 cria tia hdng
ngoqi lam hon t6n s6 c*a
tia
hr ngo4i.
D.
Tia
hdng ngogi dd quan
si4t
giao
thoa hon tia
nr ngo4i.
Cdu
37:
Trong
qud trlnh

dao
d$ng,
chilu
dil
crla
ccn lric lil
xr: treo thing
drlng
bi6n rhi0n
tri
30
crn
ddn
50
cm.
Khi ld
xo cd chi€u dli
4O cm ttri
A.
pha
dar: d$ng cia
vflt
b&ng 0.
B, lgc hdi
phuc
tdc
dung vio v$t
b*ng
vdi
luc ddn hdi.

C.
gia
tric cria
v$l
cyc
dai.
D. tdc
d$ cila
vft
cgc dai.
C0u 38: frong
th{
nghifm
l-ffng
{Yaung}
vA giaa thaa
{nh siing,
h*i khe
cdch
nhau
2 m-rn
vh
c$ch m}n
quan
sdt ? m. Dirng
{nh
s{ng don sic
voi
hu6c s$ng
}"

=
0,44 pm.
Di6m
M [€n m]n
l]
vdn
t6i thf 5, c,{ch
v6n
sdng trung tAm
m$t dogn
li
A. 1,64
mm"
B. 1,98
mm
t],2,20
mm"
D.2,4? rnm.
Ciu 39r
Xdi Ui cpc cria
m$t
mdy
phft
di$n xoay chiSu mgt
ptra
(cd
hai
cpp cg{r t*) vio
hai diu dqin
mpi:h

AB
gdni
diQn trd thuin R
=
30Qrnic n6i ti;5p v6i cu$n
cim
thuin.
bd
qo,
dign trd cdc cu6n
ddy
cta
mdy phdt.
Khi rOto cria
nriy
quay
diu
vsi
tdcd$ 1500
vOng/phrit
thi
culng dQ ddng di6n higu
dung
trong
doan mach li
lA.
Khi
r0to cia mfy
quay
ddu vdi tdc

dd
3000
vdng/phrir
thi cuong dg dbng
di$n
hi*u dpng rong dopn
mach
li
.fi A.
ng
h.r
cArn cria
cufir cim
thuin l&
A. 67,5 mH. B.
31,8
mH. C. 135
rnH.
D,63,6
mll.
CAu 40:
Trong mgt dopn m4ch dign xoay chiAu RLC mic n6i
fi6p, phft
bidu
nla sau
diy
dring?
C0ng sudt di$n
(kung
bir*r) ti0u thu tr8n cA dc,an mach

A. ludn
beng t6ng
cdng suAt tiOu thq u'6n cdc
rli€n
trd thuAn.
B. chi phu
thudc
vir:
gi6
tri difn tr*
thuin R ctia rloSn
npctr,
.
C. khdng
phlr
tliu$c
gi
vlo
Lvh C.
D. kh6ng thay
ddi ndu ta mie th€m
vir
dopn m6ch mQt hr
di8n
hodc
mdt
cugn ddy
thuin cim.
It.
PHAN ndnC

: NI6i thi sinh ehi lim mgt trong.
hai phinr
phin
A hoic
phfin
Il
A. Theo
chrmrg trinh
Chufrn
{
lCI cf,un tir ef,u 4l
d6n cau
SO)
-
Cfiu
41:
Nguoi
ta
phdn
bi$t sdng 0m,
udng hp
im,
sdng si0u
f;m dpa
trtn
A. khi ning
cAm
thu cia tai nguoi. Il. bitn do
dao. d6ng
ciia chring.

C.
bdn ch6t
v$t
ly
cia chring
khiic nhru.
D.
toc
d6
uuydn cia chring
khic
nhau.
C6u 43:
Mgrh dao d$ng dl$n tir LC duqc dilng lhm rn4ch chgn
sdng
cria mdy thrl v0 tuyiin.
Khoing thoi
gian.ngin
ntr*t
tir
lrlc
t9 diQn
dang tich di$n cgc d{ dtin
hic
dign t{ch trer
qr
bing
khCIng l& t. Tdc d0
truyin
s6ng dign tu la

3.108
tm/s)"
Sdng
di$n tri
dn mdy
thu
bit dugc
cd
bu6c sdng la
-
A,L=1.1S81.
B.L=6.10sf.
C.l.=9.108r.
n.i"=tZ.tOtt,
CSu 43: Cho ba
dao
d$ng
diiu
hba
cilng
phuong
ctng tin
sil ;
xr
=
6sin(l0lirt) crn;
x,
=
6Osin(lOra
*

&;
,r; xr
=
6cos(l0zr)
cm.
+
Dao
dpng t6ng
hgp cria ba dao
d$ng
trOn
c6
phuong
trinh:
A.
x=l2.fisin(l0lrr)cm.
C.
x=l2cos(l0zr+{lcm
'2'
S. x=1tus3{1Srt)cm.
I). x
=
6 Dsinit0zl
+
l)
cm.
'2'
lnllNc
Hgc
pHd

ruft.{c
cHUygN EH sp Hi NOI
-
IHr'THu
DAI
HQC LAtq
Z Nam
ZOt
I
Trang
Sfr
-
IvIfr de thi 35?
Swu
tdm: />Page
5
Ciu
441 Khi ndi
vii
dao dfng diAu hOa-
phdt
biAu
nlo sau
d6y
ll
dring?
A. Ndng lugng cta
vfit
dao d$ng diiu hba khdng
php

rhu$c
bi0n d6 dao
d6ng.
B, Khi
m$t
vit das d$ng
di6u hda
thi tgc dng hqp t{c dpng
lOn
v6t
ludn
huc,ng
vi r,i
tri
ci,:,
l
C. Dac dQng *rla
qon
lic don luOn li dao
d0ng tu
da.
O. Daa d$ng cta
con
lic Id xa
lu0n
ll dao
d$ng ty
d,r.
d nhir
t-ong

*6i
|.iru
ki
crir m6t
v6r
dao
,
,
,
CAu
45: Ti s0
gifra
i6c d$ trurig
binh
lon nhdt
vi
nh'
_
3
hba lI
-F
-z
c.
,i;.
D.
-,:.
\)
v3
CAu
46:

Mqt
mach
chqn mic
n6i ti6p
gdm cu in diy
thuin cam c6 d0lu ciim t-=*g,
ru ditn
ca
.
l0n
dung C
vh
bi6n
to R. I)4t vlo hai dAu
do+n mpch m$t
di$n
6p xo*y chiBu cil
t*n s6 50
Hz
v.1
di0n
;
hifu dpng 20CV.
Khi diAu chinh A,i ni6n
trd It b6ng
40
O hogc 1S0
Sthi
cdng sLrdt ti0u thu diin c
dngn

mgch
rldu 11200
!y.
Cid tricria
di$n dung
C lI
^.
2J3.
,
^.1
L
11-s
B.
"6.
tn{
n
t"
ll}
2n
C :H.
n.
?.:.1.f
'p1
xl
D,315
nfs.
D.8 m
Cirt47:
Eat
diqn

Ap
u=lJJlcosar
(vdi
U
vdar
khdng
q611
vag
hai
diudoqn
nrach
RLC khOng
phirr
nh{nli. Bi6t
dg tg cim vA
di$n dung duoc
giii
kh6ng
A6i. Oieu chinir
1r[ sd ct}a
R dd csng su6t ddu thu
cfu
dcgn
mqchdqt
cgc dgi.
ffqi
I
ltr
cuong
dQ

hi$u
dr;ng
cira dbng di$n trong
mlch. hlhi d$
cdng
sudt
cria
doqn mpch b5ng
c.
Sur.
2
n.
€ul
2
C*u
48: M$leT
thoa c6 tin,s6 dao
d6ng ri€ng f
=
900
Hz
dit
sdt mi6ng
cia.rndt 6ng nghi€m
hinh trr,r
cao 1,2
m. nd
Can nu6c
vio
6ng nghifm,

dt5n d0 cao
20 crn
(so
vdi
r15y)
thi thdy $m
dugc
khu6ch tlai rir
n;rh. T6c dS
mryin im irong kht::g khi
l$.
A.
UI
A.
353 rnls.
4.5
m.
n.
lur.
B.
340
m/s.
B. 6 rn.
C.32? rr,-s.
r 1n1
CAu
49: Mpch chqn s6ng
cria rnQf
n6y
rhu

girn
m$t
ty di6n vir
cudn cam.
Khi
thu dugc
s6ng dir;n tii cd
budc sr5ng L, ngu,)i
ta nh{n thdy
k}roing
th}i
gian
gita
hai iin
li€n ri€p
di€n fp
tr€n
t1r cd,
giri
*[
bing
giri
tri difn dp hi{u
dgng lh 5,l0'}
s. nidt t6c
d0 truy€n sdng
<1iQn
tir
Ia
3.108

(rn/s}.
Fuoc sdng X"
Ih
CSu
50:
Trong rngt
thi nghifrn, nguoi
ta ch;du
m$t chirm r{nh
siing don
sic song song hep
v}a
canh
cta
rnOt lang kinh
cd
g6c
clri6t
quang
A=
80
theo
phuong
irri:rrg g6c voi
mdt phing
phin gidc
cia
g6c
chiir
qLrang.

Chidt suit
cir chit lhm
lring kfnh
(d6i
r-oi
1ifi sdrtg dd)
lI 1.65.
Gdc lEch cria
tir sdng ld
A.5,?0.
rJ.
6,3o.
c.4n.
D.
?,8o.
B, Theo chumrg
trinh
Nfing
cao
(
10
c$u, iir
e$u
51. ttiln c$u
60)
C6u
5l: Ph6t
bi6u nlo sau
df;y lh khdng,lung
khi

ndi
vi
nr6
men
dffng
lugng cia
v*t
rin
quay
quanh
mgr trqrc c6
a;nnt
A. Eon
vi do mO mcn
ddng luong lh
kgm?/s,
B. MS
men d$ng luqmg
cia
v{t
rin ti
l0
vsi
vin tOc
g$c
c*a
nd.
C.
X6"tOng
*d.1*.iojrr"

tdc dgng ltn
v$t r*n bingithCIng thi
md nen
dgng
lugg
crla
vit
r6n
dugc
bi.o tobn.
D. Mfi inen
d$ng
lugng
1u0n
cr\ng dfiu
v6i
v$n t$c
gdc.
CAu 52: Phdt
bi6u niro
ssi
khi
ndi
vi
momen
qu6n
tinh
*iia mdt
vr;t
rin vdi

ni$l hgc rluay xdc dlnh ?
A. nlomen
qudn tfnh
cria m$t
v|t
r*n
phlr
thuQc
vi tri tiuc
quay.
TRUNC
HQC PHf}
THONG
CHUYFJ.{
FH
SP
HA NOI'-
THI
THU
f]AI
HqC L,{N 2 NiTN 2013
Trang
6fr
-
Mt
il*
ihi 357
Swu tfrm:
http ://vuphan62hn.violet.vn/
Page 6

B. mornen
qudn
tinh cira
mgt vpt
i6n
dic trung
cho mirc
qudn
tinh
cria
vit
rin trong chuyAn
d$ng
quty.
-
C.
momen
qr:{n
t{nh cta
mQt
vqt nin
cd thA fuong,
cd ftB 6m
tiy thu0c
vlo
chi}u
quay
crla v{t,
D. Dan
vi do

momen
qudn
tinh
li kgmr.
CSu
53:
Mgt
rbng
rqc k!6i luqng m, c$.trgq
quay ci5 dinh
nirn ngang
qua
tam diii
xung. Iv{$t
sgi
d&y
khong
din, cd klr6i
lugng khOngdring
ki, dugc
quin quanh
rbng rgc, diu.cdn lli cua
day
gin voi vdi
nh6 kh6i lugng
irlZ.
BS
qua
ma
sdt

d trpc
quay
vi
sfc cdn
kh6ng kh{.
Gia
t6c trong trudng
g.
Cia
tdc
vil
n{ng
khi duqc thicho
chuyAn d$ng
l}
CSu
54:
Cho mqt *dng
ngang cd
phuong
trlnh
sdng
ta
u
=
gcos2irf*
-*l
{mm)
trong
dd

x
tiinh
bing
\0,1
50
)
cm, t tinh bing
gi6y.
V{n rdc fuyin
s6ng trong m$i
truong
ih
h.*2.
s.93.
A.v=l0mls.
B,v=2m/s
A.l20N.m.
B" 60 N.m.
c.392.
D.2d3"
C,v=5m/S.
D.v=3syrr.
C.50
N.m
D. 100 N.nt"
c.
/-*:
v-u
il8r

C$u
55: Mqr
bdnh xe cd bdn kinh
R
quay
nhanh
d&n
dAu.ttr
trgng th{i nghi
r'&i
gia
tdc
gdc
1.
Oia
r$c
toin
phAn
cia mgr di€rn ftsn
vinh bsnlixetei
thd:i
di$m
t
kA
ru ldc
b{nh xe b$t
diu chuySn
d$ng
li
t

l
f ; ]
f ;
A,,
yttltt
+
y'z
.
B.
yR{l+
1rr
c.
/Rdl
+
Tf
.
D.
yttll+
y''t'
.
Cig 56: M$t
vgt
r;n
quay
nhanh
dAn d*u xung
quanh m$t
tru*
cli dinh"
Gdc

rnb
v$t
quay <lugrc trnng
khotng rhoi
gian
t
k6
tt litc bat
diu
quay
ti
lg tluqn
v6i
I
A,
+.
B. t.
t-
c.
t?. D.
.[.
CAu
S?l
MSt
bdnh
xe cd momen
qudn tfnh
edi
voi t4:c
quay

cd
dinh
1A 6 kg.m?, *ong
dirng
ytn
thi chiu
rric dpng
cia
rnornen
I[c kh6ng
ddi M
d6i
vrii $qc
quay
dd. Sau
5 s, t6c d$
gdc
cria bdnh
xe
li 100
rad/s.
Bd
qua
mgi ma
sdl nQ lan cria
mnmen
lyc
M bi*g
Ciu
58:

M$t con 6c
dcn,
d6y trec
dli
l, dugc
trec
i?i
noi
cd
gia
tiic trong
tftrimg
g.
Kdo
ccn
lic ra kh0i
vi tri cen bing
t6i li dd
gdc
a,.Tgi
thdi di€m
b*n diu. ngu*i
ta lruyen cho
qui
ciu con
lic
vdn
tdc
'r,
theo

phumrg vu6ng
g6c
voi soi
diy,
dd
nS bit diu
dao
d$ng xung
quanh
vi td c$n bing
. Bd
qua mqi ma
sdt.
Khi
qui
ciu
di
qua
vf trf can
bing
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