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Get Full Access to Fundamentals Of Engineering Thermodynamics - 8 Edition - Chapter 2 - Problem 2.23
Get Full Access to Fundamentals Of Engineering Thermodynamics - 8 Edition - Chapter 2 - Problem 2.23

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# The two major forces opposing the motion of a vehicle

ISBN: 9781118412930 139

## Solution for problem 2.23 Chapter 2

Fundamentals of Engineering Thermodynamics | 8th Edition

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Problem 2.23

The two major forces opposing the motion of a vehicle moving on a level road are the rolling resistance of the tires, Fr, and the aerodynamic drag force of the air flowing around the vehicle, Fd, given respectively by Fr f w, Fd CdA1 2 rV2 where f and Cd are constants known as the rolling resistance coefficient and drag coefficient, respectively, w and A are the vehicle weight and projected frontal area, respectively, V is the vehicle velocity, and is the air density. For a passenger car with w 5 3040 lbf, A 5 6.24 ft2 , and Cd 5 0.25, and when f 5 0.02 and 5 0.08 lb/ft3 (a) determine the power required, in hp, to overcome rolling resistance and aerodynamic drag when V is 55 mi/h. (b) plot versus vehicle velocity ranging from 0 to 75 mi/h (i) the power to overcome rolling resistance, (ii) the power to overcome aerodynamic drag, and (iii) the total power, all in hp. What implication for vehicle fuel economy can be deduced from the results of part (b)?

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