Liquid Friction!

A Thin circular disk of radius RR, rotates in a cylindrical chamber, which is filled with water (coefficient of viscosity η\eta). It is rotated with constant angular velocity ω\omega.
Find the Power developed (in watts)by the viscous forces, if the distance between the top-bottom walls and the disk is hh.

Details and Assumptions:
\bullet Neglect end effects.
\bullet η=8.9×104\eta = 8.9\times 10^{-4}
\bullet R=2mR = 2m
\bullet h=1mmh = 1mm
\bullet w=2rad/sw = 2 rad/s

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