Question: A fluid with viscosity fills the space between two long co-axial cylinders of radii R1 and R2, with R1

A fluid with viscosity η fills the space between two long co-axial cylinders of radii R1 and R2, with R1 (a) The angular velocity of the rotating fluid as a function of radius r;
(b) The moment of the friction forces acting on a unit length of the outer cylinder

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