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Two layers of different incompressible Newtonian fluids are contained between two flat plates separated by a distance D. Both layers are of the same thicnkess (D/2). The fluid in the top layer has a viscosity uii, and the fluid in the bottom layer has a viscosity ui. The bottom plate is kept stationary. To move the top plate with speed V in the horizontal direction, it is necessary (at steady state) to exert on the top plate a force F per unit plate area in the horizontal direction. An effective viscosity u* for the system is defined by
F = u*V/d
Derive a formula which expresses u* as a funcion of ui and uii only. Assume that
\(\frac{\partial p}{\partial x}=o\)
everywhere and that the flow is laminar
Although the United States has not seen ethnic terrorism on its own soil in the same manner as other countries, there are still lessons to be taken away. Discuss one lesson you see about ethnic terrorism that can be applied to terrorism facing the Un..
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Laura’s Raw Yarn (LRY) Company sells undyed wool yarn through the mail, promoting it through craft magazines.
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Does the death penalty not deter crime agree or disagree.
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