23i_Olympiada_Fysikis_G'_Lykeiou_A_Fasi_Lyseis.pdf
Transcript of 23i_Olympiada_Fysikis_G'_Lykeiou_A_Fasi_Lyseis.pdf
-
1
1 (15 ) () :
, .
= 0 (1,5 .)
() (i) m
, , r .
,
2mrI = (1 .) (ii) ,
, .
,
=
=n
1i
2ii rmI (1 .)
() :
( ). (
). .
(1,5 .)
23
( )
, 18 , 2009
0 = =
-
23 ( )
2
. () .
xmMRmxMRLL =+= 22122 21)
21(
2922
2)
492
2( 1
2
1
22 RMMRRMMR =+
9189
12
1
22 RMMRMRMR =+
=918
8 12 RMMR R14 = (4 .)
() ( )
+=+= 21
222
1 492
21
21
21 RMMRE
185 21
2
MRE = (2 .)
+=+=+=9
16169
2214
21
21
21
21 21
22
122
122
1222
2 MRMRRMMRmE
925 21
2
MRE = (2 .)
() ===18
4518
59
25 2122
122
12
MRMRMREEE 2
5 212MRE = (2 .)
2 (15 ) . .
, , , . . . , . (4 .)
( )0F = .
.. PP = (1 .) . ()
l . ... : 1=2 += 2120 2
121 mmgm l= lg2201 = ll gg 2101 lg81 = (2 .)
1
2R=x
2
A B
0
A
B
l 1
2 +
-
23 ( )
3
() .
(0.5 .) =+== 221 28)( mgmmmmPP l lg22 = (2,5 .)
() ,
2 2 , , ( 3). ....
==++=++
=
hgghgg
hmgmghmmmg
EE
2422
)(21
21 2
22
2
3..2..
llll
ll
(5 .) 3 (20 ) () 1: ,
Blower, & , , , 2 - , , .. .
2: , Blower, & , , , 2 , , .. . (4 .)
()
3 .
===
A
AAA
kgms
mP
2,011,0
2,01
smA /55,0= = 0BP smB /0=
===
A
AAA
kgms
mP
2,003,0
2,01
smA /15,0=
1 ( 1)
2 ( 2)
h
A
B
l
A
B
l 2
3
l2=h
-0,04-0,02
00,020,040,06
0,080,1
0,12
0,140,16
0 0,2 0,4 0,6 0,8 1
t (s)
P (k
gms-1
)
PA
PB
3
-
23 ( )
4
=== BBBBB kgmsmP 4,014,04,0 1 smB /35,0= (4 .) ( 0,5 . ) () 1. 11,0011,0 =+=+= kgmsPPP A 1. 11,014,003,0 =+=+= kgmsPPP A
(2 .)
Jm
Pm
PE
Jm
Pm
PE
B
B
A
A
B
B
A
A
02675,010.2410.25,28,0
14,04,0
)03,0(2
)(2
)(
03025,004,0
11,02
)(2
)(
332222
..
222
..
=+=+=+=
=+=+=
% :
%57,11100.03025,0
03025,002675,0100.%
.===
EE
. . (4 .)
() () .
(2 .) ()
NtPP
tPF
NtPP
tPF
BBBB
AAAA
7,02,0
14,035,065,0014,0
7,02,014,0
35,065,011,003,0
===
==
===
==
(2 .)
(2 .)
.P = P .
-0,8
-0,6
-0,4
-0,2
0
0,2
0,4
0,6
0,8
0 0,2 0,4 0,6 0,8 1t (s)
F (N
)
AF
BF
-
23 ( )
5
4 (15 ) . () ,
. .
=== ===
n
1i
2ii
n
1i
2ii
n
1ii rmrmLL IL = (1 .)
() () ( ) , .
= 0M LL = = (1 .)
() : , . , . , , . (L==). (1 .)
.
.
ll
ll
l
ll
l
23
331
23
31
23
0
22
..
g
m
gm
M
gm
ImLL
===
==
h. 1 2.
4623
31
21
21
2
22221
llll ===== hghg
MghMMghIEE MM
:
6021
2
42
2
2 ==
=
= lll
l
l h
A
== ll00
23 xx
23
0l=x
(12 .)
2
3 lg=
x0
l
h1
2
-
23 ( )
6
5 (15 ) . y
KyF = , . ,
KyFFy == . ... KD = (5 .)
mKmKD === 2 . =
2T KmT 2=
: KyFyF == ..
(2 .) . , S
mg. S S ( ). ,
)( gamSmamgSF
SF
y
x
==+==
(1) (2) xgamgamgamFx l)()()( ===
.
... l)( gam
, DxFx = gagam >> 0)( l (6 .)
llgamgamD === 2)( .
gT ==
l22
(2 .) 6 (20 ) . () (...)
( ) ( ) . (2 .)
() ...
, .
(2 .)
+x
+y
mgS
S
F= -Dy
y-y
+
....
-
23 ( )
7
. () dx 10101 == 1.
srad
MK 5
4,010
1 === sm /5,01,0.501 == (3 .)
() . sm /5,001 += . :
+=++=+=+=
9,02,3.5,05,0.4,0
)()( 0101....
mMmMVVmMmMPP
smV /2=
.. (3 .)
() . =+= 9,010
2 mMK
srad
310
2 = x02 ===
3/102
202022
VxxV mx 6,002 = (3 .)
() t1 M
. 44
3 211
TTt += 1 2 .
sMT 4,010
4,0221 ===
smMT 6,010
9,0222 ==+=
+=+=46,0
44,0.3
443 21
1TTt st 45,01 = (2 .)
() t0=0s
. 1 T2
(5 .)
d=0,1m
.
=10N/mm=0,5kg
+
M=0,4kg =3,2m/s
-1
-0,5
0
0,5
1
1,5
2
2,5
t (xs)
(m
/s)
0,1 0,2 0,3 0,4 0,5