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1. What is the hydraulic diameter of a rectangular air ventilation duct whose cross-section is 1 m by 25 cm? 2. In a two dimensional

1. What is the hydraulic diameter of a rectangular air ventilation duct whose cross-section is 1 m by 25 cm?

2. In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is?

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