11. Skip. A spherical bacterium (radius = 10 um) is being pushed at constant velocity across a blood vessel wall. The bacterium is sliding, not rolling, and there is no deformation of its spherical shape. Treat the vessel wall as a flat, smooth surface - no molecules bin ding. The blood is flowing at 10 cm/s relative to the bacterium and in a path parallel to the vessel wall. Blood has a viscosity of 0.04 Poise. What is the magnitude of the force due to friction between the bacterium and the vessel wall