4. Air at 20°C (u = 1.81 x 105 Pa.s) forms a boundary layer near a solid wall. The boundary layer thickness is 7 mm and the peak velocity is 9 m/s. Compute the shear stress in the boundary layer at y...

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Extracted text: 4. Air at 20°C (u = 1.81 x 105 Pa.s) forms a boundary layer near a solid wall. The boundary layer thickness is 7 mm and the peak velocity is 9 m/s. Compute the shear stress in the boundary layer at y equal to (a) 0, (b) 3.5 mm, and (c) 7 mm. Using the function v=Vmax sin[Ty/(26)] for the velocity profile. Note, the sine function in the equation has a value in radians.