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(0)

...

, 22 2011 . 17:19 +
10 3 p = 1 . 30 . ?
: 2 [1, . 70] p = 1 v' = 0,00113 3 / - , v" = 0,1943 3 / - . V : V = G v' = 30 0,00113= 0, 0339 ( 3 ). V : V = V - V = 10 - 0,0339 = 9,9661 ( 3 ). G : G = V /v" = 9,9661/0,1943 ≈ 51,29 () . x : x = G /(G + G ) = 51,29/(30 + 51,29) ≈ 0,631 . 1. . . ( , , ): . - , 2002. - 73 .


(0)

, 05 2010 . 20:57 +

-




:  
(0)

, 10 2010 . 13:10 +
( = 1,7*10^-8 *), D = 20 d = 2 . , 10 ?.E=dΦ/dt=S *dB/dt=πD2/4*dB/dt R=ρ*l/S=ρ*πD/(πd2/4)=4ρD/d2 I=E/R=(πD2/4*dB/dt)/(4ρD/d2)=πDd2/16ρ*dB/dtdB/dt=16ρI/(πDd2)=16*1,7*10-8**10/(π*0,2*(0,002)2)=1,08 /. , . , . = 0,01 , m/l = 0,01 /?, .FA=Fg Fg=mg FA=IBl IBl=mgI=mg/Bl=g(m/l)/B=9,8/2*0,01//0,01=9,8 A


:  
(0)

, 04 2010 . 12:31 +
1. m = 200 ( , ) v = 1 /. , m1 = 20 . u1 u2 .2. R1 = 5 R2 = 10 Q1 = 40 Q2 = 20 . W, , . 2) U1 = Q1/C1;U2 = Q2/C2;C1 = 4*pi*e0*R1;C2 = 4*pi*e0*R2;E1 = C1*U1^2/2;E2 = C2*U2^2/2;E0 = E1 + E2;Q = Q1 + Q2;C = C1 + C2;U = Q/C = (Q1 + Q2)/(C1 + C2);E = C*U^2/2;W = E0 - E.U1, U2, Q1, Q2, E1, E2 - , , 1- 2- ,R1, R2, C1, C2 - ,e0 - ,E0, E - , ,Q, C, U, - , , . :Q=20*10-9 ()1=5,5*10-12 ()2=11,1*10-12 ()=16,6*10-12 ()U1=7.2*10(+3) ()U2=-1,8*10(+3) ()U=1,2*10(+3) ()E1=142*10-6 ()E2=18*10-6 ()E0=160*10-6 ()E=12*10-9 ()W=148*10(+3) (). 2 , , ( , ). , , . ., , , m v , m1 v ( ). c (m+m1) u. : m*v-m1*v=(m+m1)*uu=(m*v-m1*v)/(m+m1) ~ 0.82 / Kitab


(1)

2 !

, 17 2010 . 10:03 +
1. U , < > =300, v 0,5 .2. Q, V=50 , =0,5 . .1. ( ):=i/2kT, i ; k ; . i=5 N=vN=5/2*1.38*10-23*300*0,5*6,02*1023=3115.35() U=i/2*m/M*RT=i/2*vRTU=5/2*0.5*8.31*300=3116.25()2 :V=50 = 50*10-33Δ = 0,5 = 0,5*106 : Q : , Q=ΔU = (i/2)*Δp*V, i=5 ( )Q=(5/2)*0.5*106*50*10-3=62.5*103


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, 14 2010 . 13:39 +
, 3 , , 2 . 200 2. 115 3, 20 60%3. y-. y-, . : V = 115 3, t = 20 C, φ = 0,6, ρ0= 17,3 ∙ 10-3/3.: m.. φ ρ ρ0 , . . φ = ρ/ρ0, ρ = φρ0. , , m = ρV = φρ0V = 0,6 ∙ 17,3 ∙ 10-3∙ 115 ≈ 1,19 ().: 1,19 .. 1 :, ,E=I/r2*cosα, - ; α - . :E=I/h2, (α=0, cosα=1)E=200/4=50() :cosα=h/√(h2+d2/4)E=I/(h2+d2/4)*h/√(h2+d2/4)=Ih/((h2+d2/4))3/2E=200*2/(4+9/4)3/2=25.6() 3 :e-+e+→γ1+γ2 :mec2+mec2=Tγ1+Tγ2mec2=Tγhc/λ=Tλ=hc/T=hc/mec2=h/mecλ=6.62*10-34/(3*108*9.1*10-31=2.4*10-12()


(0)

, 09 2010 . 05:22 +
t=t1, ,,, , , , .
x=x(t)
3(t*t)-t+1

y=y(t)
5(t*t)-5t/3-2

ti=1

.


x = 3t2 t + 1,
y = 5t2 5t/3 2.
t = 1
x(1) = 3 12 1 + 1 = 3 (),
y(1) = 5 12 5 1/3 2 = 4/3 ≈ 1,33 ().
, t = 1 (3; 1,33).

, . x = 0,
3t2 t + 1 = 0,
D = (-1)2 4 3 1 = -11 < 0,
, .
y = 0,
5t2 5t/3 2 = 0,
D = (-5/3)2 4 5 (-2) = 25/9 + 40 = 385/9 ≈ 42,78,
t1 = (5/3 - √(385/9))/(2 5) < 0,
t2 = (5/3 + √(385/9))/(2 5) ≈ 0,82 (),
x(0,82) = 3 (0,82)2 0,82 + 1 ≈ 2,20 ().
, t ≈ 0,82 (2,20; 0).
x , dx/dt = 0. x ,
6t 1 = 0,
t = 1/6 ≈ 0,17 (),
x(0,17) = 3 (0,17)2 0,17 + 1 ≈ 0,92 (),
y(0,17) = 5 (0,17)2 5 (0,17)/3 2 ≈ -2,14 ().
t > 0,17 dx/dt , (0,92; -2,14) x.
y , dy/dt = 0. y ,
10t 5/3 = 0,
t = 5/30 = 1/6 ≈ 0,17 (),
x(0,17) ≈ 0,92 (),
y(0,17) ≈ -2,14 ().
t > 0,17 dy/dt , (0,92; -2,14) y.

t (, t = 0 , t = 2 t = 3 ) :
x(0) = 3 02 0 + 1 = 1 (),
y(0) = 5 02 5 0/3 2 = -2 (),
x(2) = 3 22 2 + 1 = 11 (),
y(2) = 5 22 5 2/3 2 ≈ 14,67 (),
x(3) = 3 32 3 + 1 = 25 (),
y(3) = 5 32 5 3/3 2 ≈ 38 ().


t,
x,
y,
0
1
-2
0,17
0,92
-2,14
0,82
2,20
0
1
3
1,33
2
11
14,67
3
2538
.

t = 1 :
vx(1) = (dx/dt)(1) = 6 1 1 = 5 (/) ,
vy(1) = (dy/dt)(1) = 10 1 5/3 ≈ 8,33 (/) ,
v(1) = √((vx(1))2 + (vy(1))2) = √(52 + (8,33)2) ≈ 9,72 (/) .

:
ax = dvx/dt = d2x/dt2 = 6 (/2),
ay = dvy/dt = d2y/dt2 = 10 (/2),
,
a = √(ax2 + ay2) = √(62 + (10)2) ≈ 11,67 (/2)
, t = 1 .


v = √((dx/dt)2 + (dy/dt)2) = √((6t 1)2 + (10t 5/3)2) = √(36t2 12t + 1 + 100t2 100t/3 + 25/9) =
= √(136t2 136t/3 + 34/9).
,
aτ = dv/dt = 1/(2√(136t2 136t/3 + 34/9)) (272t 136/3).

aτ an t = 1 :
aτ(1) = 1/(2√(136 12 136 1/3 + 34/9)) (272 1 136/3) ≈ 11,67 (/2),
an(1) = √((a(1))2 (aτ(1))2) = 0 (/2).

t = 1 , R = ∞.


(4)

, 30 2009 . 17:52 +
, . , .. . - , . , . . . : , . , , , , . . ? . . : . , -, .. . ., , . - "" - , . - . , , , (), , . .. . - , , . . . , , (), , . . , , . , , , , .. , . , , , . , , - . , , , , , , , . - , . , , . , , , , , , , .


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