(b) A wind-tunnel experiment is performed on a small 1:5 linear-scale model of a car, in order to assess the drag force F on a new full-size car design. A dimensionless "drag coefficient" Ca is defined by C,= where A is the maximum cross-scctional area of the car in the flow. With the model car, a force of 3 N was recorded at a flow velocity u of 6 ms. Assuming that flow conditions are comparable (i.e., at the same Reynolds number), calculate the expected drag force for the full-sized car when the flow velocity past it is 31 m s (equivalent to 70 miles per hour). [The density of air p= 1.2 kg m.]
(b) A wind-tunnel experiment is performed on a small 1:5 linear-scale model of a car, in order to assess the drag force F on a new full-size car design. A dimensionless "drag coefficient" Ca is defined by C,= where A is the maximum cross-scctional area of the car in the flow. With the model car, a force of 3 N was recorded at a flow velocity u of 6 ms. Assuming that flow conditions are comparable (i.e., at the same Reynolds number), calculate the expected drag force for the full-sized car when the flow velocity past it is 31 m s (equivalent to 70 miles per hour). [The density of air p= 1.2 kg m.]
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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![(b) A wind-tunnel experiment is performed on a small 1:5 linear-scale model of a car, in order
to assess the drag force F on a new full-size car design. A dimensionless "drag coefficient"
Ca is defined by
C, =-
pu'A
where A is the maximum cross-sectional area of the car in the flow. With the model car, a
force of 3 N was recorded at a flow velocity u of 6 m s. Assuming that flow conditions
are comparable (i.e., at the same Reynolds number), calculate the expected drag force for
the full-sized car when the flow velocity past it is 31 m s (equivalent to 70 miles per
hour). [The density of air p= 1.2 kg m.]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbd33e042-ff7c-4dfd-a8d1-4a74e707bade%2F1b464356-b562-446e-abfa-22552c188f27%2Fz6sscw8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:(b) A wind-tunnel experiment is performed on a small 1:5 linear-scale model of a car, in order
to assess the drag force F on a new full-size car design. A dimensionless "drag coefficient"
Ca is defined by
C, =-
pu'A
where A is the maximum cross-sectional area of the car in the flow. With the model car, a
force of 3 N was recorded at a flow velocity u of 6 m s. Assuming that flow conditions
are comparable (i.e., at the same Reynolds number), calculate the expected drag force for
the full-sized car when the flow velocity past it is 31 m s (equivalent to 70 miles per
hour). [The density of air p= 1.2 kg m.]
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