PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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Chapter 2, Problem 15P
To determine
The distance from the front axle to the center of gravity so that it develops maximum acceleration.
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A car having a weight of 40 kN is moving at a certain speed around the curve. Assuming no lateral pressure between the tire and the pavement, compute for the following if the centrifugal ratio is 0.30.
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A 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)
Chapter 2 Solutions
PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
Ch. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - Prob. 6PCh. 2 - Prob. 7PCh. 2 - Prob. 8PCh. 2 - Prob. 9PCh. 2 - Prob. 10P
Ch. 2 - Prob. 11PCh. 2 - Prob. 12PCh. 2 - Prob. 13PCh. 2 - Prob. 14PCh. 2 - Prob. 15PCh. 2 - Prob. 16PCh. 2 - Prob. 17PCh. 2 - Prob. 18PCh. 2 - Prob. 19PCh. 2 - Prob. 20PCh. 2 - Prob. 21PCh. 2 - Prob. 22PCh. 2 - Prob. 23PCh. 2 - Prob. 24PCh. 2 - Prob. 25PCh. 2 - Prob. 26PCh. 2 - Prob. 27PCh. 2 - Prob. 28PCh. 2 - Prob. 29PCh. 2 - Prob. 30PCh. 2 - Prob. 31PCh. 2 - Prob. 32PCh. 2 - Prob. 33PCh. 2 - Prob. 34PCh. 2 - Prob. 35PCh. 2 - Prob. 36PCh. 2 - Prob. 37PCh. 2 - Prob. 38PCh. 2 - Prob. 39PCh. 2 - Prob. 40P
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- Compute the braking distance of a car traveling at 50 kph in a horizontal surface and then brought to rest after the application of the brakes if the average skid resistance is 0.55arrow_forwardTRANSPORTATION ENGINEERING A standard HL-93 Truck impends to overturn on a super elevation highway curve at a speed if 60 mph. The height of its center of gravity is 2.9m and the distance of the two front tires is 2.9 m. The superelevation is 10 degrees. •Compute the radius of the curve assuming no skidding resistance. (Use f=1.0) •Determine the value of left reaction on wheels due to centrifugal force, RCL.arrow_forwardAn auto, equipped with only front wheel brakes, has a wheelbase of 120 in. with its c.g. located 60 in. abead of the rear wheels and 36 in. above the pavement. If f= 0.80 at the tires, compute the minimum distance in which the auto can be brought to rest from a speed of 60 mph if the driver's reaction time before applying the brakes is 3/4sec. Come up with ans. S = 294 ftarrow_forward
- A vehicle 3,223mm long from center to center of wheels has center of gravity located 576mm from the road surface and 1,151mm away from the rear axle. The vehicle is travelling at a constant speed of 65 kph on a pavement that is poorly constructed and dry. Determine the percentage of braking force that should be allocated to the front brakes. mu= 0.8arrow_forwardDetermine the maximum speed in kph that a car could move around a curve having a radius of 500 m if the impact factor of that curve is 0.15. Neglect the friction between the tires and pavement.arrow_forwardcompute the braking distance for a car moving at an initial velocity of 80 kph and a final velocity of 60 kph. slope of roadway is +6% the coefficient of friction between road pavement and tries is 0.17, and the perception time is 3/4 seconds.arrow_forward
- The rated speed of a highway curve of 60 m radius is 50 kph. If the coefficient of friction between the tires and the road is 0.25, (a) What is the minimum speed at which a car can round the curve without skidding? (b) What is the frictional force exerted on the wheels of the car when the speed observed is 35 kph? 1kph= 0.28 mpsarrow_forwardThe radius of a horizontal circular curve on a highway is 120 m. The design speed is 60 km/hour, and the design coefficient of lateral friction between the tyre and the road surface is 0.15. The estimated value of superelevation required (if full lateral friction is assumed to develop), and the value of coefficient of friction needed (if no superelevation is provided) will, respectively, be A B C 1 11.6 1 10.5 1 11.6 and 0.10 and 0.37 and 0.24arrow_forwardThe 5-Mg truck and 2-Mg car are traveling with the free-rolling velocities of 37 km/h and 13 km/h, respectively, just before they collide. After the collision, the car moves with a velocity of 13 km/h to the right relative to the truck. Determine the coefficient of restitution between the truck and car.arrow_forward
- The car has a mass of 1.6 Mg and center of mass at G. If the coefficient of static friction between the shoulder of the road and the tires is μs = 0.4, determine the greatest slope θ the shoulder can have without causing the car to slip or tip over if the car travels along the shoulder at constant velocity.arrow_forwardH. W: A car hit a tree at an estimated speed of 35 mph on a 3% downgrade. A skid mark of 100 ft is observed on the pavement followed by 250 ft on the stabilized shoulder. Estimate the initial speed of the vehicle just before the pavement skid was begun. Use f = 0.45 for the pavement and f = 0.20 for the stabilized shoulder.arrow_forward* Find 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
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