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(4)

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(5)

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

d=Bcosb ds=Bcosb dldx,

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

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(6)

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(7)


1


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, , (. 2).

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

b 1 b 1= w t . , ab

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(8)

ab - ab. , ,

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s - .

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dA = Mda = idY ,

(10)

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

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(11)

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

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