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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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Sec 9] L<strong>in</strong>e Integrals 281<br />

Evaluate the l<strong>in</strong>e <strong>in</strong>tegrals taken along the follow<strong>in</strong>g space<br />

curves:<br />

2323.<br />

^<br />

c<br />

(y z)dx+(zx)dy + (x tj)dz, where C is a turn<br />

of the screw- l<strong>in</strong>e<br />

i<br />

-<br />

/ = as<strong>in</strong>/,<br />

correspond<strong>in</strong>g to the variation of the parameter<br />

2324. (p ydx + zdy + xdz, where C is the circle<br />

c<br />

I ;t = /?cosacos/,<br />

\ /y = /?cosa s<strong>in</strong> /,<br />

^ = ^s<strong>in</strong>a (a = const),<br />

traced <strong>in</strong> the direction of <strong>in</strong>creas<strong>in</strong>g parameter.<br />

/ from to<br />

2325. ( xydx + yzdy + zxdz, where OA is an arc of the<br />

OA<br />

circle<br />

situated on the side of the A'Z-plane where //>0.<br />

2326. Evaluate the l<strong>in</strong>e <strong>in</strong>tegrals of the total differentials:<br />

(, 4. 8)<br />

a) ] xdx-\-ydy zdz,<br />

(1, 0, -3)<br />

-<br />

-<br />

b) z dx // f 2x dy \- xy dz ,<br />

x<br />

j<br />

(i. i. i)<br />

(3, 4. 5)<br />

r xd\ \-\idij-\-zdz<br />

J<br />

(0, 0, 0)<br />

d) f<br />

-M<br />

^v<br />

rA'.|.y" + 2<br />

J xyz<br />

(i. , D<br />

<strong>in</strong> the first octant).<br />

'<br />

yte + mv + 'y** (the <strong>in</strong>tegration path is situated<br />

C. Green's Formula<br />

2327. Us<strong>in</strong>g Green's formula, transform the l<strong>in</strong>e <strong>in</strong>tegral<br />

2<br />

/ = \f* -\ if dx + y [xy + In (jc 4 K?T?)] dy,<br />

c<br />

where the contour C bounds the region S.

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