Two horizontal plates are parallel to one another and separated by an oil film (SAE 10 oil at 20 deg C, Table A.4) that is 1.0 mm thick.  The upper plate moves to the right at 2.0 m/s.  The bottom plate moves to the right at 6.0 m/s.  What is the shear stress in N/m2 of the oil on the upper plate?  Is the shear stress on the upper plate directed to the right or to the left?

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Planar Stresses