1. Consider two coaxial cylinders of radii KR and R as shown in the figure. a) Select a convenient control volume (Please draw it). b) Make a momentum balance for the incompressible Newtonian fluid flowing upward in the annular region. (Do not use Navier-Stokes equations!) Assume that the velocity only changes with respect to radial direction, so there is no axial gradient. c) Indicate the necessary boundary conditions for the system. d) Obtain the velocity profile with respect to r, at steady-state conditions. e) Calculate the maximum velocity