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1) For a parallel laminar flow over flat plates, the friction coefficient depends only on the Reynolds number. In the fully rough turbulent regime, the friction coefficient only relates to the surface roughness. True or False 2) a car is placed in a large wind tunnel for a full scale test. The upstream velocity is determined to be 20 m/s. The frontal area of the car is 15 m2. If the force acting on the car in the flow direction is measured to be 1000 N, what is the drag coefficient of this car? Assume the air density = 1.14 kg/m3. a) 0.15 b) 0.29 c) 0.34 d) 0.34 Ns/m 3) Drag force include friction drag and pressure drag. Friction drag increase with the increment of viscosity of the fluid. True or False

1) For a parallel laminar flow over flat plates, the friction coefficient depends only on the Reynolds number. In the fully rough turbulent regime, the friction coefficient only relates to the surface roughness. True or False 2) a car is placed in a large wind tunnel for a full scale test. The upstream velocity is determined to be 20 m/s. The frontal area of the car is 15 m2. If the force acting on the car in the flow direction is measured to be 1000 N, what is the drag coefficient of this car? Assume the air density = 1.14 kg/m3. a) 0.15 b) 0.29 c) 0.34 d) 0.34 Ns/m 3) Drag force include friction drag and pressure drag. Friction drag increase with the increment of viscosity of the fluid. True or False

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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1) For a parallel laminar flow over flat plates, the friction coefficient depends only on the Reynolds number. In the fully rough turbulent regime, the friction coefficient only relates to the surface roughness. True or False

2) a car is placed in a large wind tunnel for a full scale test. The upstream velocity is determined to be 20 m/s. The frontal area of the car is 15 m2. If the force acting on the car in the flow direction is measured to be 1000 N, what is the drag coefficient of this car? Assume the air density = 1.14 kg/m3.

a)

0.15
b)

0.29
c)

0.34
d)

0.34 Ns/m

3) Drag force include friction drag and pressure drag. Friction drag increase with the increment of viscosity of the fluid. True or False

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