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flow, respectively. Hence To = fcvotdt where v0 is the undisturbed velocity field given by (1) and the subscript t indicates the tangential component. By Stokes' theorem, r0=//,(curl Vo);dA = -UkA where A is the area of /. Hence in our example, r0= -Ukird1. If we substitute this for T in (9), assuming, as Tsien does,6 that ri = 0, then our result (9) reduces to (10). ' The author is indebted to Dr. Tsien for pointing this out. He had at first mistakenly supposed that Tsien's result was based on the assumption F = 0.

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