Derive an equation for the viscosity in terms
of angular velocity, ω, torque, T,
submerged inner cylinder height, L, inner cylinder radius, Ri,
and outer cylinder radius, Ro.
Calculate the viscosity value when ω = 55 rev/min, T = 0.9 N-m, L = 0.3 m, Ri = 0.12 m and Ro = 0.13 m.