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Переходим к цилиндрическим координатам по формулам,<br />

аналогичным формулам (13.26): х = pcostp, z = psintp,<br />

у = у. Тогда<br />

2п 4 2<br />

JJ [ydxdydz = J JJ у р ф А р ф = J < Ы р ф J ydy =<br />

Г ^ о о р/2<br />

= i W p(4- K ) rfp4 f ( 2p2-is)<br />

о о<br />

- 1 .1 6 * 6 ” - Нм.,<br />

2 л 4<br />

JJJdx

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