100 bài tập vật lý 10 đợt 3 (KHTN HN)

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'