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The simple fluid coupling is installed between a motor and a driven load to allow slippage between the two. Develop the relationship between the slip rate between the disks, ${}_1-{}_2.$ under steady$-$state operation as a function of the applied torque $T,$ the disk diameter $D,$ the thickness $h$ of the thin film of Newtonian fluid filling the gap between the disks, and the fluid's viscosity $.$