9.10 Air at standard conditions and 20 m/s flows over one side of a horizontal smooth flat plate that is 1:5 m long and 0:8 m wide. A trip wire is used at the leading edge to ensure that the boundary layer is turbulent. Assume that the velocity profile is represented by a 1/7th power law and evaluate the boundary-layer thickness at the trailing edge of the plate. Determine the wall shear stress at the trailing edge of the plate and the total drag force on the plate.