The car shown in the figure below moves at a constant speed on a highway and has a drag coefficient Cpc of 0.32 with the windows and roof closed. What is the percent increase of horsepower needed to maintain the speed if the windows and roof are then opened? With the windows and roof open, the drag coefficient increases to Cpo = 0.43. Assume the frontal area remains the same.

The car shown in the figure below moves at a constant speed on a highway and has a drag coefficient Cpc of 0.32 with the windows and roof closed. What is the percent increase of horsepower needed to maintain the speed if the windows and roof are then opened? With the windows and roof open, the drag coefficient increases to Cpo = 0.43. Assume the frontal area remains the same.

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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Question

The car shown in the figure below moves
at a constant speed on a highway and has
a drag coefficient Cpc of 0.32 with the
windows and roof closed. What is the
percent increase of horsepower needed to
maintain the speed if the windows and
roof are then opened? With the windows
and roof open, the drag coefficient
increases to Cpo = 0.43. Assume the
frontal area remains the same.
Windows and roof closed:
CD=CDc
Windows open; roof open:
C₂=CDo

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