Glass spheres of 0.1 in. diameter fall at constant velocities of 0.1 and \(0.05 \mathrm{ft} / \mathrm{s}\) through two different oils of the same specific gravity in very large tanks. If the viscosity of the first oil is \(0.002 \mathrm{lbf} \cdot \mathrm{s} / \mathrm{ft}^{2}\), what is the viscosity of the second?