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 CDo = 0.43. Assume the frontal area remains the same.

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 CDo = 0.43. Assume the frontal area remains the same.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.49P

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Question

Help me please

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 CDo = 0.43. Assume the frontal area remains the
same.
Windows and roof closed:
Windows open; roof open:
C, = C
C, = Cp.

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