Principles Of Highway Engineering And Traffic Analysis
7th Edition
ISBN: 9781119493969
Author: Mannering, Fred L., WASHBURN, Scott S.
Publisher: Wiley,
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Chapter 2, Problem 35P
To determine
The minimum tractive effort required for the vehicle to maintains its given speed.
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A 2600 lb vehicle has a drag coefficient of 0.35 and a frontal area of 22 ft?. What is the minimum tractive effort required for this vehicle to maintain a 60 mi/hour speed on a 5% upgrade through an air density of 0.002045-slugs/ft?
While traveling at a constant speed a driver saw a road block 112 m away. He applied the brakes and the car decelerated uniformly at 6.4 m/s2. It stopped 5 m from the block. The driver’s PRT is 2.2 seconds. Sketch and calculate the initial constant speed of the vehicle in kph if;a. The roadway is levelb. The roadway grade is +10%c. The roadway grade is -10%
Car 1 is at gasoline station for 10 minutes. The driver notices that car 2 passes at a speed of 40 mph. How long will it take for Car 1 to overtake Car 2 if it accelerated at 4 m/s?
Chapter 2 Solutions
Principles Of Highway Engineering And Traffic Analysis
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- If the car in Example 2.9 had CD = 0.45 and area = 25 ft2, what is the difference in minimum theoretical stopping distances with and without aerodynamic resistance considered (all other factors the same as in Example 2.9)? Example 2.9 EFFECTS OF GRADE ON THEORETICAL MINIMUM STOPPING DISTANCE A car is traveling at 80 mi/h and has a braking efficiency of 80%. The brakes are applied to miss an object that is 150 ft from the point of brake application, and the coefficient of road adhesion is 0.85. Ignoring aerodynamic resistance and assuming the theoretical minimum stopping distance, estimate how fast the car will be going when it strikes the object if (a) the surface is level and (b) the surface is on a 5% upgrade.arrow_forwardBadly need within 1hr pls, thank you! Two Cars A and B are approaching each other in adjacent highway lanes. At t= 0,A and B are 1.25 km apart, their speeds are yA = 120 km/h and ya * 72 km/h, and they are at points P and Q. respectively. Knowing that A passes point 0. 50 s after B was there and that B passes point P. 53 s after A was there, determine the uniform accelerations of A and B,also,when the vehicles pass each other the distance of cars A and B from their origin and the speed of B at that time.arrow_forwardA car is traveling at 76 mi/hr down a 3% grade on poor, wet pavement. The car's braking efficiency is 90%. The brakes were applied 320 ft before impacting an object. The car had an antilock braking system, but the system failed 200ft after the brakes had been applied (wheels locked). What speed was the car traveling at just before it impacted the object? (Assume theoretical stopping distance, ignore air resistance, and let Frl=0.015)arrow_forward
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