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Obrazac za zadatke
2012/2013. .
VIII
27. 28. 04. 2013.
,
1. ( 1) 3, , . : R3 = R1 + R2, 1 V. (20 )
2. , a = 50 mm b = 100 mm ( 2). d = 0,05 mm, r1 = 7 ( 1) r2 = 4,5 ( 2). (). (B). , ( ). kr1 = 120 kV/cm kr2 = 80 kV/cm. . (20 )
3. . u, p ? (20 )
4. , , v1 = 500 m/s, , , v2 = 400 m/s. = 353 K. ( ) 1/3 . ? 120 J/kgK. (20 )
5. a, m, F . , , . . a F. . .
(20 )
2
4
6
8
10
12
1.7
5.0
8.3
10.8
14.3
17.0
:
: !
. 1 2
_____________________________________________________________________________
: , ,
: . , , o
: . , ,
!
VIII
27. 28. 04. 2013.
,
1. , , b , 0 V (5 ). .. : (3 ), (2 ). (3 ), , (2 ). 1 V, 1 V (5 ).
2. I : , , . , , , = 6,2 nF, 3,98 nF (5), 2,42 nF (3). , (5) 4,84 nF (2). . (), , , , . , (, (5)
II : , . . , , , , . (, .
3. , (2 ) (3 ) ( ), , , = (2 ) (3 ). (2 ), (2 ) 2 (4 ). 50 % (2 ).
4. , : (5 ). , (3 ) . : (2 ), 125 (5 ). : 478 = 205 (5 ).
5. , (3)
:
(4), (3),
(7) .
: (3),
(3).
(4)
!
[
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N
F
[
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2
m/s
a
2
2
/Nm
C
12
0
10
85
.
8
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=
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tr
F
F
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-
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m
F
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m
F
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kg
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1
s
m
s
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1
51
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6
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15
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m
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kg
1.509
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663
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m
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N
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2
663
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m
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kg
s
m
s
m
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663
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663
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F