Tnrilng
DHSP
TP.
HCM
'
Khoa
Vat
LY
pi,
rm
lr,rON,
cd
Lf
THUYET
Thdi
gian: 90
Phrit
CAu
1: Thdnh
l{p
phtfdng
trinh
Lagrange
loai hai'
Cflu
2:
Chdt
didm
khdi
lugng
m

gdc
o
cd
oinh
ld
tf;m
cfla
tnldng
hJc
rldn
vi
tri
cria
chdt
tlidm)
a)
Chrlng
minh.ring
chdt
didm
chuydn
d6ng
trong
I
m{t
phEng
cd
Ainn'
Xdc
clinh

x(0)=
a,ft(O)=0
,Y
(0)
=0,;(o)=vu
c)
Tim
cd
ndng
cfia
hQ.
CAu
3:
Eia
trbn
rtdng
chdt
tam
O,
brin
kinh
R,
khdi
lttgng
m'c6
thd
quay drrgc
qlunt
trUc
I

suy
rQ'g
li
g,Jc l€ctr
Q
g16aOA
vtli
phddng
thing
tlfrng
taithiti
didm
bdt
k!.
a)
Tim
hdm
Lagrange
cfia
cd
hQ'
b)
X6c
ttinh
phiong
trinh
chuydn
dQng
ctla
tlia

76c
Os
,t\mv$n
tdc
tAm
O ctia
dia.
I
=
J/ry\
u"
-r
Lg
JruY
6