Физика-КР4
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5.4.
401.,
=30 -
. R=20 .
, , -
I=25 ( ).
B=20 .
402. , -
d=5 , I= 10 .
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B |
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r= 5 , : ) , )
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403. -
. I1=100 I2=50 .
d=20 . B
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404. I=50 , -
. H
,
h=20 .
405., , . -
H1=50 . -
, . -
H2
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a=20 I=50 . B
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407. ,
a=8 b=12, I=50 . H
B .
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408. I=20 |
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R=40 |
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H B |
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409. I=40 |
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R=20 |
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410. R1=10 R2=15
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I1=20 I2=30 . |
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411. H |
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500 . |
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pm=6 2. I |
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412. |
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S=250 2, N=500 |
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, I=5 , - |
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=1000 . : 1) pm |
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; 2) , ,
=30 .
413. R=20 , I=50 ,
=103 . =30 .
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414. , -
, . R1
R2
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415.a=10 , -
I=6 , =0.8 -
=50 . , -
-
?
416.=2 -
.
32
R=1 h=6 . -
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417.-
S=100 2.
I=50 , -
, . -
,
=0.4 .
418.,
,
. , m1=12 .,
R1=2 . m2 ( .)
, R2=2.31 .
419.=0.5
l=20 .
I=2 . V=10 -
.
t=10 , .
420., U=300 ,
a=4
. F , -
I=5 ?
421.S=100 2 n=5-1 ,
( =0.5 ). -
<Ei> , -
, ,
.
422., N=1000 S=1000 2, -
n=10 -1 -
=5 104 . -
. -
Ei max, .
423.=0.5
n=10 -1 l=20 .
-
. U -.
424., -
, .
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Q=50 . -, R=10 .
425. D=5 R=0.02
=0.3 . -
=40 . Q
?
426. S=10 2 N=1000 .
I=5 0.1 .
: 1) L ; 2)
<Ei>,
t=0.01
=0.5 .
427., ,
N=250 L1=36 . -
L2=100 , -
,
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?
428.N=600 . I=10 -
=80 . L .
429.N=800 . -
S=10 2. ,
=8 . <Ei> -
, , -
t=0.8 .
430.V=950 .
Ei, ,
=39.8 l=12.5 .
431., R=20 , -
N=500 , I=2 . -
w .
432.n=20
. I -
w=0.1 3? ,
.
433.l=0.6 S=10 2.
, ,
=0.1 . ?
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434.I
r=5 -
w=1 3?
435.S=5 2 =20
. w .
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436., N=1000 , -
0.2 . W ,
I=1 . .
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437.N=500 .
W , |
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L, R |
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I=2 |
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R0 |
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=1.0 . |
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438. L=2.0 - |
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R=2.0 - |
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E=3.0 ( .7). |
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.7 |
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R0=2.0 . - |
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, R R0 -
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439., R=30 , -
N=1000 , I=5.0 . -
w , -
h=40 .
440.W , N=1500 ,
I=2.0
=0.2 . -
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: 441...450 -
, .8.
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.8 |
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441.=1.3 .
.
, -
?
442., -
D=500 , N=1000.
,
d=1 . I=0.85
=6.0 . -
.
.
443.S=5.0 2.
I=1.0 =225 .
n ,
.
444.( -
) l=1.0 . -
d=4.0 .
n=8 1 . I
=1.0 ?
445., -
, N=1000 .
36
I=1.0 . d
0.5 ? l 1.0 .
446.l 1.2 ,
S=20 2. , -
=0.5 . d 8 .
, -
, ?
447.l=0.628 . -
,
N=1000 I=1.2 .
448., -, N=1000 .
a=200 , b=250 . W,
, I=1.2 . -
, -
0 .
449., D=300 ,
S=500 2, N=800 .
I=3.0 . -
d=2.0 .
, : ) -
; ) -.
450.I ,
d=3.6 -
=1.4 . l=80 ,
N=1500 .
451.-
, , -
X1 0.02 sin(5 t /2) X 2 0.03 sin(5 t /4)
.
452.
X1 4 sin( t) X1 3 sin( t /2) . -
. . 453. =25
L=1.015 . -
q0=2.5 . ( -) t WE,
WB W .
37
/8, - -.
454.
U C 50 cos(104 t) . C=0.1 . -
, L , -I t ,
.
455. -
I 0.02 sin(400 t) A. L=1 . -
.
WE .
456. -
L=1.00 , -
9.7 92 . -
?
457. X 5 sin(2 t) .
, -
Wn=0.1 , F=5 .
t . 458.
X1 2 sin( t /3) X 2 5 cos( t) . -
. -
.
459.F t=0.2
W ,
X 15 sin(4 t) . m=20 .
460.amax , -
= 25 ,
Vmax=0.5 .
.
461.t1=5
2 . t2, ,
8 ?
462.=0.003. -
N , ,
.
463.m= 0.5 k= 20
.
= 0.004. N ,
38
, A(t)
3 . t ?
464.= 5 10-3 -
60% .
, R=10 .
465.-
= 103 . 0 -
, ( ) p= 998 . 466.
1= 400 2=600 .
) p. ,
<< 0.
467.
, “ ”
: ) 10 %; ) ?
=0.1 0, 0- -
.
468.= 405, L=10 R=2 .
-
, , ?
469.L=1 .
, ,
0.05 2.7 ?
470.Q
: ( ) p=600 ,
=350 , R=15 .
471. , =500
=0.25 , . =70 .
c -
Vmax.
472. X 10 sin ( 
2) t. ,
=300 .
, l=600 . -
t=4 .
473. X 4 sin(600 t) .
X , -
39
l=75 , t=0.01 -
. =300 . 474. X , V -
a , l=20 -
, t=1 .
=100 , X 0.5 sin(2.5 t) .
475., -
l1=10 l2=16 . =0.04 ,
=300 .
476.,
l=2.5 ,
=1.0 .
477.X ,
l= /2, t= /6.
=0.05 .
478. , -
l=4 , t= /6 -
. .
479.c , -
,
l=12 , /2. =24 .
480.,
l=15 .
40