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### PROBLEMS

 3.1-1. Force on a Cylinder in a Wind Tunnel. Air at 101.3 kPa absolute and 25°C is flowing at a velocity of 10 m/s in a wind tunnel. A long cylinder having a diameter of 90 mm is placed in the tunnel and the axis of the cylinder is held perpendicular to the air flow. What is the force on the cylinder per meter length? A1: Ans. CD = 1.3, FD = 6.94 N 3.1-2. Wind Force on a Steam Boiler Stack. A cylindrical steam boiler stack has a diameter of 1.0 m and is 30.0 m high. It is exposed to a wind at 25°C having a velocity of 50 miles/h. Calculate the force exerted on the boiler stack. A2: Ans. CD = 0.33, FD = 2935 N 3.1-3. Effect of Velocity on Force on a Sphere and Stokes' Law. A sphere having a diameter of 0.042 m is held in a small wind tunnel, ...

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