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A rotational viscometer is designed according to the Figure 1 shown below. A viscous liquid (incompressible and Newtonian fluid with density P and viscosity l) is placed in the region between two coaxial cylinders with length L. The inner one (radius KR) rotates at an angular velocity 2 and the outer one (outer radius R) is fixed due to a weight Was shown in the Figure 1. Please find the torque on the outer cylinder applied by the rotational fluid using equations of change. Also calculate the required W to fix the outer cylinder. Note that L/R>>1, so only Voexists and Vo is a function of r (radial coordinate) only. Please also note that pressure is not a function of 0. R link Figure 1 A rotational viscometer