In a simple concentric shaft-bearing arrangement, the lubricant flows in the 2 mm gap between the shaft and the bearing. The flow may be assumed to be a plane Couette flow with zero pressure gradient. The diameter of the shaft is 100 mm and its tangential speed is 10m/s. The dynamic viscosity of the lubricant is 0.1kg/m.s. The frictional resisting force (in Newton) per 100mm length of the bearing is _________