Question 3: A) A driver is traveling at an average speed of 40 kph when a person is crossing the road. If the perception reaction time of the driver is 2 sec., and the acceleration rate (a) is 5 m/sece', knowing that f, (a/g) calculate: 1. The safe S.S.D. on a level road. 2. The safe S.S.D. on a 3% uphill road. 3. The safe S.S.D. on a 2% downhill road.
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- The driver of the vehicle on a level road determined that she could increase her speed from rest to 51 kph in 36.80 seconds and from rest to 66 kph in 96.80 seconds. If it can be assumed that the acceleration of the vehicle takes the form:du/dt = α - βutwhere u is the vehicle speed in m/sec. Determine the maximum acceleration of the vehicleThe driver of the vehicle on a level road determined that she could increase her speed from rest to 51 kph in 36.80 seconds and from rest to 66 kph in 96.80 seconds. If it can be assumed that the acceleration of the vehicle takes the form du/dt = - βut where u is the vehicle speed in m/sec. Determine the maximum acceleration of the vehicle.If the car in Example 2.9 had CD = 0.45 and area = 25 ft2, what is the difference in minimum theoretical stopping distances with and without aerodynamic resistance considered (all other factors the same as in Example 2.9)? Example 2.9 EFFECTS OF GRADE ON THEORETICAL MINIMUM STOPPING DISTANCE A car is traveling at 80 mi/h and has a braking efficiency of 80%. The brakes are applied to miss an object that is 150 ft from the point of brake application, and the coefficient of road adhesion is 0.85. Ignoring aerodynamic resistance and assuming the theoretical minimum stopping distance, estimate how fast the car will be going when it strikes the object if (a) the surface is level and (b) the surface is on a 5% upgrade.
- While traveling at a constant speed a driver saw a road block 112 m away. He applied the brakes and the car decelerated uniformly at 6.4 m/s2. It stopped 5 m from the block. The driver’s PRT is 2.2 seconds. Sketch and calculate the initial constant speed of the vehicle in kph if;a. The roadway is levelb. The roadway grade is +10%c. The roadway grade is -10%In traveling a distance of 2.0 km between points A and D, a car is driven at 106 km/h from A to B for t seconds and 47 km/h from C to D also for t seconds. If the brakes are applied for 3.7 seconds between B and C to give the car a uniform deceleration, calculate t and the distance s between A and B.A car starts from rest and travels 10 sec. with an acceleration of a = 4 – 0.3t, then runs for 30 sec. at constant velocity and finally comes to rest by decelerating at 3.125 m/s2. Determine the velocity of the car after 10 sec. Determine the distance traveled by the car during the period of 10 sec. c. Determine the total distance traveled by the car until it stops.
- compute 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.The brakes of a car are applied, causing it to slow down at a rate of 10 ft/s2. Knowing that the car stops 300 ft, determine (a) how fast the car was traveling immediately before brakes were applied, (b) the time required for the car to stop.A car is traveling at a speed of 100 ft/s which accelerates 12 ft/s2. The perception reaction time for the driver is 2.40 s. If the maximum grade of the road is -3.7%, compute the following: a. Braking distance in meters b. Lag distance in meters
- Two cars are traveling on level terrain at 60 mi/h on a road with a coefficient of adhesion of 0.8. The driver of car 1 has a 2.5-s perception/reaction time and the driver of car 2 has a 2.0-s perception/reaction time. Both cars are side by side and the drivers are able to stop their respective cars in the same amount of distance after first seeing a roadway obstacle (perception/reaction plus vehicle stopping distance). If the braking efficiency of car 2 is 0.75, determine the braking efficiency of car 1. (Assume minimum theoretical stopping distance and ignore aerodynamic resistance.)A driver is driving at 75 kph when a dog suddenly appeared and stopped at the middle of the road. Determine the distance the vehicle would move before the driver could activate the brakes. Assume PRT is 2.50 secs. If the friction factor is 0.30 and brake efficiency is 45%, determine the braking distance. If the vehicle is 250 m away when the driver sees the dog, will the dog be hit by the vehicle?You are to determine the duration of the yellow light at a highway intersection. Assume that cars will be approaching the intersection traveling at 70 mph, and that the reaction time of the driver is 2.5 sec and that cars achieve a deceleration of 1/8 of the gravitational acceleration. if g=32.2 fps^2, a. how long must the traffic light remain yellow to allow drivers to come to stop before the traffic light turns red? b. what is the minimum distance of a car from the intersection when the lightturns yellow to ensure that it comes to a full stop before the intersection?