Principles of Highway Engineering and Traffic Analysi (NEW!!)
6th Edition
ISBN: 9781119305026
Author: Fred L. Mannering, Scott S. Washburn
Publisher: WILEY
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Chapter 2, Problem 17P
To determine
The difference in minimum theoretical stopping distances with and without aerodynamic resistance considered.
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Situation 3. A road having a radius of 120m and has angle of 9.31 degrees from the horizontal. The center of gravity of the car is located 0.80m above the roadway and the distance between the two front wheels is 1.20m. If the car has a total weight of 15 KN,
a. Compute the normal acceleration and the velocity of the car before overturning.
b. If uk= 0.60, what is the velocity of the car without sliding?
Please answer this with a complete solution and with a Free Body Diagram PLEASE. Thank you.
compute the braking distance (in meters). if a vehicle is moving down at a speed of 83 kph along an inclined surface (G = 2%). and the coefficient of friction is 0.33.
A vehicle is moving down at a speed of 80 kph along an inclined surface (G = 2%). If the coefficient of friction is 0.33, compute the braking distance in meters. Round off to two decimal places.
Chapter 2 Solutions
Principles of Highway Engineering and Traffic Analysi (NEW!!)
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- In a certain situation it was estimated that 24.9% of the braking force was applied to the rear brakes in order for the car to develop the maximum forces required stop the car. If the total braking force develop was 5565 N and the road is wet (u = 0.6) wheel base of 295 cm and a center of gravity 75 cm above the pavement road and 120 cm behind the front axle. What was the speed of the car in kph?arrow_forwardIn traveling a distance of 3.3 km between points A and D, a car is driven at 86 km/h from A to B for t seconds and 42 km/h from C to D also for t seconds. If the brakes are applied for 4.8 seconds between B and C to give the car a uniform deceleration, calculate t and the distance s between A and B.arrow_forwardIf 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_forward
- A moving car is traveling at 80 kph when the brakes are applied to it. The car stillmoves at a distance of 35 m, before it completely stops. Determine the coefficientof friction between the tires and the road surface.arrow_forwardA car travelling at 40 mph on uphill grade of 5%. If the brakes are suddenly applied, it will travel 56 m.then stops. Determine the coefficient of friction between the road surface and the tires. Round off youranswer to two decimal places.arrow_forwardKnowing that the coefficient friction between tires and the road is 0.8 for the automobile shown, determine the maximum possible acceleration on a level road, assuming four-wheel drives, rear-wheel drives and front-wheel drive.arrow_forward
- Determine the horsepower produced by a passenger car travelling at a speed of 68 mi/hr on a radius of curvature of 1,200 ft road of 4% grade with a smooth pavement. Assume the weight of the car is 4500 lb and the cross sectional area of the car is 45 ft2.arrow_forwardThe car is traveling at a constant speed through a dip in the road. The radius of curvature of the road at point A, the bottom of the dip is 471m. What speed of the car (kph) would result in an acceleration of magnitude 0.2g when the car is at A? use 3 decimal placesarrow_forwardFind the angle of banking for a highway curve of 90 m radius for cars traveling at 128 Km/hr, if the coefficient of friction between the tires and the road surface is 0.40. What is the rated speed of the road? (In rated speed, the friction force between the tires and the road is zero)arrow_forward
- The brakes of a car are applied, causing it to slow down at a rate of 10 ft/s2. Knowing that the car stops 300 ft, determine (a) how fast the car was traveling immediately before brakes were applied, (b) the time required for the car to stop.arrow_forwardFind at what maximum speed a vehicle can move round a curve of 50 m radius without slip on a road banked with 1 in 10 slope? Take coefficient of friction between the tyres of the vehicle and the road equal to 0.4 Correct answer is 57.53 kpharrow_forwardA car starts from rest and travels 10 sec. with an acceleration of a = 4 – 0.3t, then runs for 30 sec. at constant velocity and finally comes to rest by decelerating at 3.125 m/s2. Determine the velocity of the car after 10 sec. Determine the distance traveled by the car during the period of 10 sec. c. Determine the total distance traveled by the car until it stops.arrow_forward
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