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(b) A smooth, horizontal and flat object is exposed to horizontal 25 m/s air flow in a wind tunnel. The width and length of the object is 2.5 m and 4.0 m respectively. Boundary layer regions were immediately formed on the top and bottom surface of the object. Consider Point A in the turbulent boundary layer region at position x=1.500 m and y= 0.0075 m where x and y are horizontal and vertical axes of the coordinate system respectively. The origin of the coordinates system is on the surface, along the leading edge of the plate. Verify that point A is in the turbulent boundary layer region. Determine the (1) (ii) (iii) (iv) boundary layer thickness at the cross-section of point A. velocity at Point A. viscous sublayer thickness at the cross-section of point A. overall shearing resistance on the top surface of the object. (Pair = 1.20 kg/m³, Vair = 1.49 x 105 m²/s, Rex,cr = 500,000) (2 marks) (9 marks) (20 marks)