PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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Chapter 2, Problem 8P
To determine
The maximum acceleration of a car from rest position, if the car is on a paved, level roadway surface with a coefficient of adhesion is
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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.
The vehicle has a weight of 2600 lb and center of gravity at G. Determine the horizontal force P that must be applied to overcome the rolling resistance of the wheels. The coefficient of rolling resistance is 0.5 in. The tires have adiameter of 2.75 ft.
A 12.52 kN car has a 2.75 m wheelbase, with its center of gravity located 60 cm from the pavement and 115.0 cm behind the front axle. 4 people weighing on average 75 kg loaded the vehicle, shifting the center of gravity 12.0 cm nearer to the rear axle. What is the maximum tractive effort (N) that can be developed if the car is a front wheel drive? Use coefficient of road adhesion = 0.55 .
Chapter 2 Solutions
PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
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- A vehicle weighing a 50 kN is moving at a constant speed around a circular curve. Neglecting the friction between the tires and the pavement and the centrifugal ratio (the ratio of the centrifugal force experience by the vehicle on the curve to its own weight) is 0.30. The degree of the curve is 5 degrees.a. Calculate the centrifugal force.b. Calculate the maximum speed the vehicle could move around the curve (in kph)c. If the skid resistance is 0.15, calculate the maximum super elevation that can be provided for the speed calculated from b.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_forwardDetermine 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_forward
- 15. 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.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_forwardThe angular displacement of the centrifuge is given by θ = 3.4[t + 29e-0.040t - 29] rad, where t is in seconds and t = 0 is the startup time. If the person loses consciousness at an acceleration level of 8.9g, determine the time t at which this would occur. Verify that the tangential acceleration is negligible as the normal acceleration approaches 8.9g.arrow_forward
- Determine the horsepower developed by a passenger car traveling at a speed of 60 mph on an upgrade of 4% with a smooth pavement. The weight of the car is 4500 lb and the cross-sectional area of the car is 45 ft2.arrow_forwardA racing cyclist can reach a maximum speed of 30 km/hr on a sunny day. The sum of the weight of the bicycle and himself is 65 kg. Rolling friction of wheels are Fr=7.5N . The drag coefficient and the front area are respectively Cd=1.2 , A= 0.25m^2. This athlete plans to run at 24km/hr when there is a head wind of 10km/hr and run 40km/h when there is a tailwind of 10km/hr. Is it possible?arrow_forwardA 11,455 kN car has a 4,915 mm wheelbase, with its center of gravity located 536 mm from the pavement and 1,226 mm behind the front axle. Five people weighing on average 75 kg each loaded the vehicle, shifting the center of gravity 138 mm nearer to the rear axle. What is the maximum tractive effort (N) that can be developed if the car is a rear wheel drive? Use coefficient of road adhesion=0.55.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 11120 N car is designed with a 310 cm wheelbase. The center of gravity is located 60 cm above the pavement and 105 cm behind the front axle. If the coefficient of road adhesion is 0.6, what is the maximum tractive effort that can be developed if the car is (a) front-wheel drive and (b) rear-wheel drive? From the previous question, how far back from the front axle would the center of gravity have to be to ensure that the maximum tractive effort developed for front- and rear-wheel drive options is equal?arrow_forwardA 3500-lb vehicle (CD = 0.38, A_f= 26 ft^2, p =0.002378 slugs/ft^3) is driven on a surface with a coefficient of adhesion of 0.5, and the coefficient of rolling friction is approximated as 0.015 for all speeds. Assuming minimum theoretical stopping distances, if the vehicle comes to a stop 260 ft after brake application on a level surface and has a braking efficiency of 0.82, what was its initial speed (a) if aerodynamic resistance is considered and (b) if aerodynamic resistance is ignored?arrow_forward
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