Question

Principles of Highway Engineering and Traffic Analysis (6th Edition)

Chapter 2, Problem 35P

2.35 A 2500-lb vehicle has a drag coefficient of 0.35
and a frontal area of 20 ft2. What is the minimum
tractive effort required for this vehicle to maintain a
70 mi/h speed on a 5% upgrade through an air
density of 0.002045-slugs/ft3?
a) 242.9 lb
b) 197.0 lb
c) 161.9 lb
d) 160.1 lb

Answer 1