ĐỀ THI HSG VẬT LÝ TỈNH HẢI HƯƠNG 2013-2014

SỞ GIÁO DỤC VÀ ĐÀO TẠO
HẢI DƯƠNG
________________________
KÌ THI CHỌN HỌC SINH GIỎI TỈNH HẢI DƯƠNG
Lớp 12 THPT năm học 2013 - 2014
Môn thi: VẬT LÝ
Thời gian làm bài: 180 phút
(Đề thi có 4 câu và gồm 02 trang)
___________________________________________
Câu 1 (2,0 điểm).
 ABCD (
bBClAB  ;
),  



B
 sao cho
 

0t


 cho khung
) 



 

 

    


Câu 2 (2,0 điểm).
u,
cm 
 
 2).
a. 

b.      

c. 
 Khi 
              

Câu 3 (3,5 điểm).
1. 
1
, m
2

3

gam
m
mm 100
2
3
21




1
, k
2
, k
3

mN
k
kk /40
2
3
21

)

ĐỀ CHÍNH THỨC

O
A
B
Hình vẽ 2


k
1

k

2

k
3

m
1

m
2

m
3

O
1

O
2

O
3

Hình vẽ 3



A
B
C

D
l
b

B

Hình vẽ 1

ngang  (
cmOOOO 5,1
3221

) 3
: 
1

6; m
2


(
0t
.
a.         m
1
  m
2
 
t 
1

m

cmx 2
1


s
20


2
m


b.
1

2
.
c. 
3

?
2.   
mNk /40

100( )mg

. H
16,0


. 
cm. 
2
10( / )g m s
. 
a. T
.
Câu 4 (2,5 điểm).

th         
)20cos(
1
tau
A










2
20cos
2



tau
B
4
 
1. Cho
cmAB 20
;
mma 6
1


mma 36
2


a.   O 
b. .
2. Cho

75,6AB

aaa 
21
.  : C 
 AO

5,2;  DOCO
).   
  B .

___________ Hết ___________

 
 