The aerodynamic drag on a car depends on the shape of the car. For example, the car shown in the following figure has a drag coefficient of 0.36 with the windows and roof closed. The drag coefficient increases to 0.45 with the windows and roof open. If the car moves at 115 mph with the windows and roof closed, at what speed is it moving with the windows and roof open if the amount of power needed to overcome aerodynamic drag is the same in both cases? Assume frontal area remains the same. Air density p = 1.23 kg/m3 Select one: O a. 97.5 mph O b. 106.75 mph Oc. None of these O d. 60.3 mph Windows and roof closed: CD= 0.35 Windows open; roof open: CD = 0.45
The aerodynamic drag on a car depends on the shape of the car. For example, the car shown in the following figure has a drag coefficient of 0.36 with the windows and roof closed. The drag coefficient increases to 0.45 with the windows and roof open. If the car moves at 115 mph with the windows and roof closed, at what speed is it moving with the windows and roof open if the amount of power needed to overcome aerodynamic drag is the same in both cases? Assume frontal area remains the same. Air density p = 1.23 kg/m3 Select one: O a. 97.5 mph O b. 106.75 mph Oc. None of these O d. 60.3 mph Windows and roof closed: CD= 0.35 Windows open; roof open: CD = 0.45
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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Transcribed Image Text:The aerodynamic drag on a car depends on the shape of the car. For example, the car shown in the following figure has a drag coefficient of
0.36 with the windows and roof closed. The drag coefficient increases to 0.45 with the windows and roof open. If the car moves at 115 mph
with the windows and roof closed, at what speed is it moving with the windows and roof open if the amount of power needed to overcome
aerodynamic drag is the same in both cases? Assume frontal area remains the same. Air density p = 1.23 kg/m3
Select one:
O a. 97.5 mph
O b. 106.75 mph
c. None of these
O d. 60.3 mph
Windows and roof
closed: Cp = 0.35
Windows open; roof
open: Cp = 0.45
E
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