Principles of Highway Engineering and Traffic Analysi (NEW!!)
6th Edition
ISBN: 9781119305026
Author: Fred L. Mannering, Scott S. Washburn
Publisher: WILEY
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Chapter 2, Problem 22P
To determine
The speed of the car when it strikes the object.
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A civil engineer's preliminary design for a freeway off-ramp is circular with radius R = 75m. What is the maximum speed (kph) at which vehicles will reach the ramp without losing traction of he believes that the coefficient of static friction between tires and road is least 0.35?
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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 0.55
A car travelling at 40 mph on uphill grade of 5%. If the brakes are suddenly applied, it will travel 56 m.then stops. Determine the coefficient of friction between the road surface and the tires. Round off youranswer to two decimal places.
Chapter 2 Solutions
Principles of Highway Engineering and Traffic Analysi (NEW!!)
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- X Incorrect The 3620-lb car is traveling at 25 mi/hr when the driver applies the brakes, and the car continues to move along the circular path. What is the maximum deceleration possible (a, is negative if the speed is decreasing) if the tires are limited to a total horizontal friction force of 2290 Ib? 105 ft Answer: a = -8.940 ft/sec2arrow_forwardThe car is moving with a speed vo = 46 mi/hr up the 8-percent grade, and the driver applies the brakes at point A, causing all wheels to skid. The coefficient of kinetic friction for the rain-slicked road is lk = 0.61. Determine the stopping distance sĄB. Repeat your calculations for the case when the car is moving downhill from B to A. в 8 100 Answers: Uphill: SAB = ft Downhill: SBA i ftarrow_forwardQuestion-- A vehicle is moving on a road of grade +4% at a speed of 20 m/s. Consider the coefficient of rolling friction as 0.46 and acceleration due to gravity as 10 m/s². On applying brakes to reach a speed of 10 m/s, find the required braking distance along the horizontal.arrow_forward
- A 3500-lb vehicle (CD = 0.38, A_f= 26 ft^2, p =0.002378 slugs/ft^3) is driven on a surface with a coefficient of adhesion of 0.5, and the coefficient of rolling friction is approximated as 0.015 for all speeds. Assuming minimum theoretical stopping distances, if the vehicle comes to a stop 260 ft after brake application on a level surface and has a braking efficiency of 0.82, what was its initial speed (a) if aerodynamic resistance is considered and (b) if aerodynamic resistance is ignored?arrow_forwardCurrent Attempt in Progress The 3620-lb car is traveling at 25 mi/hr when the driver applies the brakes, and the car continues to move along the circular path. What is the maximum deceleration possible (a, is negative if the speed is decreasing) if the tires are limited to a total horizontal friction force of 2290 Ib? 105 ft Answer: a= ft/sec?arrow_forwardA moving car is traveling at 80 kph when the brakes are applied to it. The car stillmoves at a distance of 35 m, before it completely stops. Determine the coefficientof friction between the tires and the road surface.arrow_forward
- The angular displacement of the centrifuge is given by θ = 3.4[t + 29e-0.040t - 29] rad, where t is in seconds and t = 0 is the startup time. If the person loses consciousness at an acceleration level of 8.9g, determine the time t at which this would occur. Verify that the tangential acceleration is negligible as the normal acceleration approaches 8.9g.arrow_forwardThe vehicle has a weight of 2600 lb and center of gravity at G. Determine the horizontal force P that must be applied to overcome the rolling resistance of the wheels. The coefficient of rolling resistance is 0.5 in. The tires have adiameter of 2.75 ft.arrow_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_forward
- A 2400-lb vehicle (CD = 0.38, Af = 26 ft², and p 0.002378 slugs/ft³) is driven on a surface with coefficient of adhesion equal to 0.8 and a coefficient of rolling friction of 0.014 at all speeds. Assuming minimum theoretical stopping distances, if the vehicle comes to a stop 200 ft after brake application on a level surface and has a braking efficiency of 0.85, what was its initial speed (a) considering aerodynamic resistances, and (b) ignoring aerodynamic resistance?arrow_forward1. A driver is travelling at 50 mph is 80 m from a wall ahead, if the driver applies the brake immediately at t-2 secs, and begins slowing down at 10m/s^2. a. Find the distance from the stopping point to the wall. b. Determine the braking time or the time during deceleration. c. Determine the average skid resistance, assuming brake efficiency of 70%.arrow_forwardA vehicle weighing a 50 kN is moving at a constant speed around a circular curve. Neglecting the friction between the tires and the pavement and the centrifugal ratio (the ratio of the centrifugal force experience by the vehicle on the curve to its own weight) is 0.30. The degree of the curve is 5 degrees.a. Calculate the centrifugal force.b. Calculate the maximum speed the vehicle could move around the curve (in kph)c. If the skid resistance is 0.15, calculate the maximum super elevation that can be provided for the speed calculated from b.arrow_forward
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