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A flat plate, 2m × 0.4m is set parallel to a uniform stream of air (density 1.2kg/m3 and viscosity 16 centistokes) with its shorter edges along the flow. The air velocity is 30 km/h. What is the approximate estimated thickness of boundary layer at the downstream end of the plate?              

a. 1.96 mm                  b. 438 mm

c. 13.12 mm                d. 9.51 mm    

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