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9-30 Consider the following steady, three-dimensional velocity field in Cartesian coordinates: V = (u, v, w) = (axy b)i-2cy + dxyk, where a, b,

9-30 Consider the following steady, three-dimensional velocity field in Cartesian coordinates: V = (u, v, w) = (axy b)i-2cy + dxyk, where a, b, c, and d are con- stants. Under what conditions is this flow field incompress- ible? Answer: a = 6c

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