Question: A certain flow field has a velocity potential described as * * = - ( 3 x ^ 2 y - y ^ 3 )

A certain flow field has a velocity potential described as
** =-(3x^2y - y^3)**
where the velocity potential has a unit of sq. ft/s when x and y are in feet. Determine the pressure difference in psi between the points (1,2) and (4,4) where the coordinates are in feet, if the fluid is water and elevation changes are negligible.

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