PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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Chapter 2, Problem 27P
To determine

The minimum distance from the stalled car at which the driver could apply the brakes and still stop before hitting it.

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A driver is traveling 70 mi/hr on a road with a -2% downgrade. The driver's vehicle has a braking efficiency of 90% and has anti-lock brakes. There is a stalled car on the road 500 ft ahead of the driver. The road is in good condition and is initially dry, but is wet for a 200 ft stretch just before the stalled car. What is the maximum allowable perception-reaction time of the driver such that she can still stop before hitting the stalled car? (Assume theoretical stopping distance, ignore air resistance, and let fri = 0.013.)
A rear-wheel-drive 2800-lb drag race car has a 170-inch wheelbase and a center of gravity 20 inches above the pavement and 140 inches behind the front axle. The owners wish to achieve an initial acceleration from rest of 22 ft/s 2 on a level paved surface. What is the minimum coefficient of road adhesion (in %) needed to achieve this acceleration? (Assume y m = 1.00.)
a truck was travelling uphill at 50kph. the brakes are suddenly applied and the truck stopped in a distance of 16.1m. if the coefficient of friction between the tires and the road surface is 0.4, what is the grade of the road?
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