Couette flow: flow between 2 long concentric cylinders of radii ro and ri, created by the rotation of one of them. solve the flow problem for a newtonian, incompressible fluid for the following two cases:

1. the outer cylinder of radius ro is rotating with an angular velocity ω (s^-1 for units). also calculate the torque for this.

2. the inner cylinder of radius ri is rotating with an angular velocity -ω (s^-1 for units). also calculate the torque for this.