10
Dx = 4 F = 50 H. W , Dx1 = 3
:
F=50H Dx= 4= 0,04. Dx1=3=0,03
W1 = Dx2 /2, W2 = Dx12 /2.
, , , (W2)
Dw=W2-W1= Dx2 /2- Dx12 /2.=/2* Dx2 - Dx12
k F = − kΔx
Dw=(F/2 Dx1)* Dx2 - Dx12 =(50/2*0,03)*0,04-0,03=0,75*0,01=75
19
m=2 x = 2sin π t. W W t = 1/3 .
:
M=2 = 2 × 10−3
x = 2sin π t
t = 1/3 .
Wk=((π)2*2 × 10−3/2)*(1*10-1)2*cos2(πt)= 3,24*10-5
W=((π)2*2 × 10−3/2)*(1*10-1)2*sin2(πt)= 9,78 × 10−8
28
m = 250, 1 = 200, . = 25 . 2 .
:
A=-i/2*m/M*R(T1-T2)
(Q=0) U=A, U = 5/2mR(T2-T1), m=0,025/ ( 5/2 ).
2-1=2/(5mR)=50*103*0,025/(5*0,25*8,31)=5193,75/8,31=625.
2=1+625=1250.
37
{C} t = 27 C. . 1,62 .
:
P=CRT, C , /
R - 8,314 /(∙)
T
1 = 273 , 27 = 300 .
P=1.62 =1,62*106
NA (6,0210²³ ⁻¹), N .
N = PNA/RT = (1,62*106 *6,0210²³)/8.314*300=9.75*1029/2494=3,91*1026
=N/ NA=3,91*1026/6,0210²³=6,4 × 1048 /.
46
, r = 8 F = 15.6 * 10-5 H
:
Q F = kQ²/r²
Q² = Fr²/k
k- =9*10⁹ H
Q = r√(F/k) = 0.8√(15.6 * 10-5 /(9*10⁹)) = 1,1*10-4
55
i I = 20, . U = 12. =1,2 * 10-7 *.
|
|
:
I=U/R
U=12B
R= *L/S,
L=20 ,
-
S -
i=I/S=U/( *L) = 12/(1,2 * 10-7*20)= 5 × 106 /2
64
l =45, =30 , F = 30 . , I =2a.
:
A=30 .
L=45
F=30mH
I=2
B-?
:
sin30=0,5
B=F/i*l*sina=30/2*45*sin30=0,6 =60*104
73
L = 0,4 . R , I 20% Dt = 0,1 .
:
L=0.4
t= 0.1c
I = 20%I0
, R L :
0.2I0=I0(I-e-Rt/L)
0.2= I-e-Rt/L
0.8= e-Rt/L
-Rt/L=ln0.8
R=L*ln0.8/t
R=892
82
. d = 280 . , 65
:
- 2d*sin0=nL, L=2d*sin0/n
n=1 , 0=a.
L= 2d*sina=2*280*sin65=507 =0,507
91
5%- l1 = 10 1 = 3. 2 l2 = 15 , 2 =5,4
:
1 = 3
l1 = 10
1=5%
2 =5,4
l2 = 15
, L, :
=a*C*L. 1=a*C1*L1, a=1/C1*L1
2= a*C2*L2.
2=2/a*L2=(2*L1/1*L2)*C1=(5.4*0.1/3*0,15)*5%=6
1. . . .: , 2009.
2. . . : , . / . . , . . , . . . 4- ., . . .: . ., 2007.