. , . , , .

- i, e r , Y

.

(1)

, dt

.

(2)

, dA,

.

(3)

img/s_mc_10.gif

l, i (.1 )). f, , dx. (3)

img/image59.gif.

(4)

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(5)

, (5) . dl dx (. 1 ))

d=Bcosb ds=Bcosb dldx,

b - B ds=dl dx, dl . (5)

img/image61.gif

(6)

img/image62.gif.

(7)


1


img/s_mc_11.gif

, , (. 2).

ab ad (6) df1=iBcosb 1dl1 df2=iBcosb 2dl2, b 2 = 90 , bc ad .

b 1 b 1= w t . , ab

img/image63.gif,

(8)

ab - ab. , ,

img/image64.gif,

(9)

s - .

(3), da

dA = Mda = idY ,

(10)

a = w t, da = d(w t) = w dt.

img/image65.gif.

(11)

- b , , .. Y = Y m sin b . Y (11) , Y m=Bs ,

img/image66.gif.

(12)

, (9) (12) . , w Y ,

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(13)

, , , (9) (12) b b = w t. ,

.

(14)

, , , , , , .


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