An element for sensing local shear stress is positioned in a flat plate 1 meter from the leading edge. The element simply consists of a small plate, 1 cm × 1 cm, mounted flush with the wall, and the shear force is measured on the plate. The fluid flowing by the plate is air with a free-stream velocity of V = 42 m/s, a density of 1.2 kg/m³, and a kinematic viscosity of 1.5 × 10^–5 m²/s. The boundary layer is tripped at the leading edge. What is the magnitude of the force due to shear stress acting on the element?

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1 cm V 1 cm Plan view Tripping wire Fs -1m