Chapter 2, Problem 149P

A viscometer constructed of two $\text{30-cm}$ -long concentric cylinders is used to measure the Viscosity of a fluid. The outer diameter of the inner cylinder is $\text{9}\text{cm,}$ and the gap between the two cylinders is $\text{0}\text{.18}\text{cm}\text{.}$ The inner cylinder is rotated at $\text{250}\text{rpm,}$ and the torque is measured to be $\text{1}\text{.4N}\cdot \text{m}\text{.}$ The viscosity of the fluid is

  (a) $\text{0}\text{.0084}\text{N}\cdot {\text{s/m}}^{\text{2}}$
  (b) $0.017\text{N}\cdot {\text{s/m}}^{\text{2}}$
  (c) $0.062\text{N}\cdot {\text{s/m}}^{\text{2}}$
  (d) $0.0049\text{N}\cdot {\text{s/m}}^{\text{2}}$
  (e) $0.56\text{N}\cdot {\text{s/m}}^{\text{2}}$