Solution: The wind blows across a field with an approximate velocity profile as shown in the figure. Use Reynolds equation with the parameter V equal to the velocity to determine the momentum flowrate across the vertical surface A-B which is of unit depth into the paper.

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The wind blows across a field with an approximate velocity profile as shown in the figure. Use Reynolds equation with the parameter V equal to the velocity to determine the momentum flowrate across the vertical surface A-B which is of unit depth into the paper.