Question: What is the shear force of a fluid (velocity vec{u}) near the wall for a moving wall (velocity (overrightarrow{u_{wall}}))?
Options
A : vec{F}=-mufrac{vec{u}}{Delta y} imes area
B : vec{F}=-mufrac{vec{u}-overrightarrow{u_{wall}}}{Delta y} imes area
C : vec{F}=-mufrac{vec{u}-overrightarrow{u_{wall}}}{Delta y}
D : vec{F}=-mufrac{vec{u}}{Delta y}
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