4) You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 1515 lb and was traveling eastward. Car B weighs 1125 lb and was traveling westward at 42.0 mph. The cars locked bumpers and slid eastward with their wheels locked for 22.5 ft before stopping. You have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750. What is the velocity/speed?

4) You have been called to testify as an expert witness in a trial involving a head-on collision. Car A weighs 1515 lb and was traveling eastward. Car B weighs 1125 lb and was traveling westward at 42.0 mph. The cars locked bumpers and slid eastward with their wheels locked for 22.5 ft before stopping. You have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750. What is the velocity/speed?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A car is traveling on a -4.20% grade for a design speed of 90 kph. Coefficient of friction between tires and pavement is 0.33. Driver's reaction time (including perception time) is 2.50 seconds. Determine the following: a.) acceleration of the vehicle in ft/s2 , b.) Stopping sight distance in meters. SHOW COMPLETE SOLUTION UPVOTE GUARANTEED asap.
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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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Two drivers each have a reaction time of 2.5 seconds. One is obeying a 90 km/h speed limit, and the other is travelling illegally at 108 km/h. How much distance will each of the drivers cover while perceiving/reaction to the need to stop, and what will the total stopping distance be for each driver (using practical stopping distance and assuming roadway grade g = -2.5%). Longitudinal friction coefficient (fi) can be calculated by the equation f = 1.0371 V-0.2729 where V vehicle speed in km/h.|
1. A car is approachin an intersection with velocity 35 mph. When the car is at a distance of 200 ft from the intersection, the signal turned yellow. If the driver decides to break, will he be able to stop safely? The driver's reaction time is 1.5 s. Assume the road surface as leveled. The maximum braking effort is applied. Will your answer change, if the grade of the road surface is downhill 3%? A car is at a distance of 200 ft from an intersection stop line when the signal turned yellow. What should be the minimum speed of the car (miles/hour) if the driver decides to apply brake and is just able to stop at the line? Use reaction time of 1.5 s and the road surface has zero grade.
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A two-lane highway (two 12-ft lanes) has a posted speed limit of 45 mi/h and one section has both horizontal and vertical curves, as shown in the figure below. A recent daytime crash (driver traveling eastbound and striking a stationary roadway object) resulted in a fatality and a lawsuit alleging that the 45 mi/h posted speed limit is an unsafe speed for the curves in question and was a major cause of the crash. Evaluate and comment on the roadway design if superelevation and radius, as well as SSD and K (rate of curvature) values of the road was adequate in safety provisions. Use g = 32.2 ft/sec2. Use 1.47 as conversion factor from mi/h to ft/s. Formula of rate of curvature is K = L/A hint: compare values of fs, SSD, and K with allowable values listed below allowable fs for 45 mi/h at e = 7.0%: 0.15 allowable SSD for 45 mi/h = 360 ft allowable K at 45 mi/h = 79
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A test driver’s perception-reaction time is being conducted on a special testing track with wet pavement and a driving speed of 50 kph. When the driver is sober, a stop can be made just in time to avoid hitting the object that is visible 40m. ahead. After a few drinks of San Miguel beer, under exactly the same condition, the driver fails to stop in time and strikes the object at speed of 30 kph. Determine the driver’s perception-reaction time after he was drinking. Assume coefficient of friction is 0.6