A velocity field is described by the following equations: 10y -10x U = x²+y2 V = x2+y2' and w=0 (a) Is this flow compressible or incompressible? (b) Find the pressure gradient. Assume frictionless flow in the z-axis, the density is 1.2 kg/m³, and the z-axis is aligned with gravity. Also assume the normal and shear effects are negligible.

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