In a certain viscous, incompressible flow field with zero body forces the velocity compo...

In a certain viscous, incompressible flow field with zero body forces the velocity components are

where a, b, and c are constant. (a) Use the Navier–Stokes equations to determine an expression for the pressure gradient in the x direction. (b) For what combination of the constants a, b, and c 1if any2 will the shearing stress, , be zero at where the velocity is zero?