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Engineering · Mechanical Engineering
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1 Air at 20°C and with a free stream velocity of 40 m/s flows past a smooth thin plate which is 3 m wide and 10 m long in the flow direction. Assuming a turbulent boundary layer from the leading edge, determine the shear stress and the boundary layer thickness 6 m from the leading edge. Take density 1.2 kg/m3 and kinematic viscosity149 x 10 m2/s. 2. An open rectangular box section, sides 3m x 20 m and 1.5 m x 20 m, is drawn submerged through still water, at 20°C, at a velocity of 9 m/s. determine the overall drag force, neglecting any edge effects.

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