#77 Newton's Law of Viscosity | 1D Form | Continuum Mechanics &Transport Phenomena

[@792y]

I think second example solution is wrong. Inner cylinder torque and RPM is given, there for we must count inner cylinder radius; not outer cylinder. Ri = Ro - t = 6-0.15 = 5.85 cm. Then viscosity would be 0.189 Pa- sec. or 1.89 poise