takes about 3 s for a driver having 0.1% alcohol in his system to react to a situation to avoid a collision. if such drivers are traveling on a straight road at 40.11ft/s and their cars can decelerate at 2.714ft/s^2, determine
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it takes about 3 s for a driver having 0.1% alcohol in his system to react to a situation to avoid a collision. if such drivers are traveling on a straight road at 40.11ft/s and their cars can decelerate at 2.714ft/s^2, determine the shortest stopping distance d (in feet) from the moment they see the pedestrians.
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- The gap between 2 consecutive automobiles is 25 meters. At a certain time the front vehicle is traveling at 85 kph and the following vehicle at 60 kph. If both vehicles start accelerating at the same time, determine the gap between two vehicles after 21 seconds if the acceleration of the vehicles can be assumed to take the following forms: du / dt = 1.04 – 0.080ut (leading vehicle) du / dt = 1.03 - 0.075ut ( following vehicle)A train which is traveling at 80 mi/h applies its brakes as it reaches point A and slows down with a constant deceleration. Its decreased velocity is observed to be 60 mi/h as it passes a point 1/2 mi beyond A. A car moving at 50 mi/h passes point B at the same instant that the train reaches point A. In an unwise effort to beat the train to the crossing, the driver "steps on the gas." Calculate the constant acceleration "a" that the car must have in order to beat the train to the crossing by 4 sec and find the velocity "v" of the car as it reaches the crossing. Train 1 mi 80 mi/hr Car 50 mi/hr 1.3 mi3. Tests reveal that a normal driver takes about 0.75 s before he or she can react to a situation to avoid a collision. It takes about 3 s for a driver having 0.1% alcohol in his system to do the same. If such drivers are traveling on a straight road at 30 mph (44 ft/s) and their cars can decelerate at 2 ft/s², determine the shortest stopping distance d for each from the moment they see the pedestrians. Moral: If you must drink, please don't drive!
- Tests reveal that a normal driver takes about 0.75s before he or she reacts to a situation to avoid a collision.It takes 3s for a driver having 0.1% alcohol im his or her system to do the same.If such drivers are traveling on a straight road at 50km/h and their cars can decelerate at 0.6m/s^2, determine the shortest stopping distance d for each driver from the moment they see the pedestriansTests reveal that a normal driver takes about 0.75 ss before he or she can react to a situation to avoid a collision. It takes about 3 ss for a driver having 0.1%% alcohol in his system to do the same. If such drivers are traveling on a straight road at 30 mphmph (44 ft/sft/s) and their cars can decelerate at 21 ft/s2ft/s2, determine the shortest stopping distance dd for normal driver from the moment he or she see the pedestrians.Five cars are traveling at constant speeds 24, 31, 28, 35, 19 kph. respectively, in a uniform section of highway 4 km long. Determine the time mean and space mean speeds. Which one is higher, time mean speed or space mean speed? Can you think of the reason why this is so?
- Traffic in an interstate at 7:15 AM is observed to have spacing of 250 feet; and average headway of 3 sec. Estimate the volume, density and the speed.A driver takes 3.2 seconds to react to a situation complex while driving at 55 miles/hour. How far the vehicle goes before the driver initiates a physical response to the situation (i.e., applies the brakes)?DYNAMICS PROBLEM 1: UNIFORM ACCELERATION A motorist is traveling at 70 km/hr when he sees a traffic light in an intersection 250 m ahead turn red. The light's red cycle is 15 s. The motorist wants to enter the intersection without stopping his vehicle, just as the light turns green, 1.1. What uniform deceleration of the vehicle will just put the motorist in the intersection when the light turns green? a. 0.18 m/s? c. 0.37 m/s? b. 0.25 m/s? d. 1.3 m/s? 1.2. If the vehicle decelerates at a constant rate of 0.5 m/s?, what will be its speed when the light turns green? а. 43 kph с. 59 kph b. 52 kph d. 63 kph
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