P2207_fall10_lecture - A(assume both are at same speed Elephant B Feather C Same Today Fluid friction Viscous and turbulent drag Turbulent drag

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A. Elephant B. Feather C. Same (assume both are at same speed)
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Today: Fluid friction: Viscous and turbulent drag Turbulent drag force Damage from hurricanes Air drag Fish and bird formations Terminal speed
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Laminar Flow: Low velocities / small diameters / "thick" fluids viscous drag Turbulent flow: High velocities / larger dia-meters / "thin" fluids turbulent drag
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The force due to turbulent air drag depends on the density of the fluid (in kg/m 3 ), the area A swept out by the object as it moves through the fluid (in m 2 ), and the object's speed v relative to the fluid (in m/s). Using dimensional analysis, what is the relation between D , , A , and v ? A. D Av B. D Av 2 C. D A 2 v D. D = Av E. D = Av 2
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Damage from Hurricanes:
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D=(1/2) C A v 2 , Assume C 1 A v D D (m 2 ) (m/s) (N) (lb) 0.3 9 14 3 0.5 20 120 30 0.5 30 270 60 5 50 7500 1700
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This note was uploaded on 12/18/2011 for the course PHYS 2207 at Cornell University (Engineering School).

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P2207_fall10_lecture - A(assume both are at same speed Elephant B Feather C Same Today Fluid friction Viscous and turbulent drag Turbulent drag

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