An approximated velocity profile for a laminar boundary layer is given as u(y) z Usin 28 where U is the stream velocity far from the wall and & is the boundary layer thickness, as shown in Fig 2. If the fluid is helium (u = 1.94 × 10-5N.s/m²) at 20°C and 1 atm, and if U = 10.8 m/s and 8= 3 cm, use the formula to (a) Estimate the wall shear stress Tw in N/m², and (b) Find the position in the boundary layer where t is one-half of Tw

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