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550 - 500 – Gross engine horsepower required 450 - Air resistance 400 – 350 – 300 – 250 – 200 150 - Rolling resistance, hp 100 - 50 – 10 20 30 40 50 60 70 80 Vehicle speed, mi/h (a) (b) Horsepower requ ired

550 - 500 – Gross engine horsepower required 450 - Air resistance 400 – 350 – 300 – 250 – 200 150 - Rolling resistance, hp 100 - 50 – 10 20 30 40 50 60 70 80 Vehicle speed, mi/h (a) (b) Horsepower requ ired

Elements Of Electromagnetics
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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A tractor-trailer truck has a drag area CDA = 8 m2 bare and
6.7 m2 with an aerodynamic deflector (Fig. 7.18b). Its rolling
resistance is 50 N for each mile per hour of speed.
Calculate the total horsepower required at sea level with
and without the deflector, if the truck moves at (a) 55 mi/h
and (b) 75 mi/h.

550 - 500 – Gross engine horsepower required 450 - Air resistance 400 – 350 – 300 – 250 – 200 150 - Rolling resistance, hp 100 - 50 – 10 20 30 40 50 60 70 80 Vehicle speed, mi/h (a) (b) Horsepower requ ired
Transcribed Image Text:550 - 500 – Gross engine horsepower required 450 - Air resistance 400 – 350 – 300 – 250 – 200 150 - Rolling resistance, hp 100 - 50 – 10 20 30 40 50 60 70 80 Vehicle speed, mi/h (a) (b) Horsepower requ ired
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