ENGINEERING FUNDAMENTALS
6th Edition
ISBN: 9781337705011
Author: MOAVENI
Publisher: CENGAGE L
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Chapter 6, Problem 22P
To determine
Find the appropriate unit for
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A model known as stopping sight distance is used by civil engineers to design roadways. This simple model estimates the distance a driver needs in order to stop his car while traveling at a certain speed after detecting a hazard.
A model known as stopping sight distance is
used by civil engineers to design roadways. This
simple model estimates the distance a driver
needs in order to stop his car while traveling at
a certain speed after detecting a hazard. The
model proposed by the American Association
of State Highway and Transportation Officials
(AASHTO) is given by
V²
S =
2g(f±G)
+TV
where
S = stopping sight distance (ft)
V = initial speed (ft/s)
g = accelaration due to gravity, 32.2 ft/s?
f = coefficient of friction between tires
and roadways
G = grade of road
T = driver reaction time (s)
What are the appropriate units for f
and G if the preceding equation is to be
homogeneous in units? Show all steps of
your work.
In a particular transportation study, the following
traffic study were recorded:
Flow
Speed
(kph)
Density
(km/veh)
(veh/hr)
1600
80
20
3705
39
95
3900
65
60
2400
20
120
1000
15
66.67
4000
50
80
Fit the required points using Greenshield's Model
Fit the required points using parabolic relations from
Greenshield's Model
Chapter 6 Solutions
ENGINEERING FUNDAMENTALS
Ch. 6.1 - Prob. 1BYGCh. 6.1 - Prob. 2BYGCh. 6.1 - Prob. 3BYGCh. 6.1 - Prob. 4BYGCh. 6.1 - Prob. BYGVCh. 6.2 - Prob. 1BYGCh. 6.2 - Prob. 2BYGCh. 6.2 - Prob. 3BYGCh. 6.2 - Prob. 4BYGCh. 6.2 - Prob. 5BYG
Ch. 6.2 - Prob. 6BYGCh. 6.2 - Prob. BYGVCh. 6.3 - Prob. 1BYGCh. 6.3 - Prob. 2BYGCh. 6.3 - Prob. 3BYGCh. 6.3 - Prob. 4BYGCh. 6.3 - Prob. BYGVCh. 6.5 - Prob. 1BYGCh. 6.5 - Prob. 2BYGCh. 6.5 - Prob. 3BYGCh. 6.5 - Prob. 4BYGCh. 6.5 - Prob. BYGVCh. 6.6 - Prob. 1BYGCh. 6.6 - Prob. 2BYGCh. 6.6 - Prob. 3BYGCh. 6.6 - Prob. BYGVCh. 6 - Prob. 1PCh. 6 - Prob. 2PCh. 6 - Prob. 3PCh. 6 - Prob. 4PCh. 6 - Prob. 5PCh. 6 - Prob. 6PCh. 6 - Prob. 7PCh. 6 - Prob. 8PCh. 6 - Prob. 9PCh. 6 - Prob. 10PCh. 6 - Prob. 11PCh. 6 - Prob. 12PCh. 6 - Prob. 13PCh. 6 - Prob. 14PCh. 6 - Prob. 15PCh. 6 - Prob. 16PCh. 6 - Prob. 17PCh. 6 - Prob. 18PCh. 6 - Prob. 19PCh. 6 - Prob. 20PCh. 6 - Prob. 21PCh. 6 - Prob. 22PCh. 6 - Prob. 23PCh. 6 - The air resistance to the motion of a vehicle is...Ch. 6 - Prob. 25PCh. 6 - Prob. 26PCh. 6 - Prob. 27PCh. 6 - Prob. 28PCh. 6 - Prob. 29PCh. 6 - Prob. 30PCh. 6 - Prob. 31PCh. 6 - Prob. 32PCh. 6 - Prob. 33PCh. 6 - The calorie is defined as the amount of heat...Ch. 6 - Prob. 35PCh. 6 - Prob. 36PCh. 6 - Prob. 37PCh. 6 - Prob. 38PCh. 6 - Prob. 39PCh. 6 - Prob. 40PCh. 6 - For the fin equation described in Problem 6.25, if...Ch. 6 - Prob. 42PCh. 6 - Prob. 43PCh. 6 - Prob. 44PCh. 6 - Prob. 45PCh. 6 - Prob. 46PCh. 6 - Prob. 47PCh. 6 - Prob. 48PCh. 6 - Prob. 49PCh. 6 - Prob. 50PCh. 6 - Prob. 51P
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- An engineer collected a speed sample along a highway. The sample is shown as {30 mph, 35 mph, 44 mph, 65 mph, 65 mph, 75 mph, 80 mph}. Which speed is used to represent the avg. speed of traffic flow? What is that speed value? Select one: a. Space-mean speed; 50 mph b. Time-mean speed; 50 mph c. Space-mean speed; 56 mph O d. Time-mean speed; 56 mpharrow_forwardXY= 50 km/hr Read the question carefully and Give me right solution according to the questionarrow_forwardResults of traffic flow studies on a highway indicate that the flow-density relationship can be described by the expression. ufk² k; q=u₁k- If speed and density observations give the data shown below, develop an appropriate expression for speed versus density for this highway. (Use the following as necessary: k. Assume u is in mi/h and k is in veh/mi. Do not include units in your answer.) Speed (mi/h) Density (veh/mi) 66.075 56 54 45 40 28 21 17 19 24 44 55 72 89 100 X Determine the density (in veh/mi) at which the maximum volume will occur as well as the value of the maximum volume (in veh/h). density at maximum volume maximum volume 132.15 X Your response differs from the correct answer by more than 100%. veh/mi 48.403 X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. veh/harrow_forward
- 4. A car is traveling at a constant speed of 130 kph at a location where the speed limit is 100 kph. A police officer gives chase and from rest begins to accelerate at the constant rate of 6 m/s2 until a speed of 160 kph is reached and maintained. How much distance is required for the officer to over- take car A. Set your own variables for each parameter as you see fit. 5. A projectile is fired downward in an experimental fluid and experiences an acceleration of a = o-nv², where o and n are positive constants and v representing the velocity. Determine the distance travelled by the projectile when its velocity has been reduced to half. Determine also the terminal velocity. Evaluate for a = 0.7 m/s², n = 0.2 m-¹, and initial velocity of 4 m/s.arrow_forwardResults of traffic flow studies on a highway indicate that the flow-density relationship can be described by the expression. Us q=uck - If speed and density observations give the data shown below, develop an appropriate expression for speed versus density for this highway. (Use the following as necessary: k. Assume u is in mi/h and k is in veh/mi. Do not include units in your answer.) Speed (mi/h) Density (veh/mi) 11 ufk² kj 57 53 45 39 28 21 18 density at maximum volume 21 22 39 60 70 86 97 Determine the density (in veh/mi) at which the maximum volume will occur as well as the value of the maximum volume (in veh/h). 80 X Your response differs from the correct answer by more than 10%. Double check your calculations. veh/miarrow_forwardAssume you are observing traffic in a single lane of a highway at a specific location. You measure the average headway and average spacing of passing vehicles as 3.2 seconds and 20 m, respectively. Calculate the flow, average speed, and density of the traffic stream in this lane. Use the editor to format your answerarrow_forward
- Match the following to True/False. A. GPS devices are an example of mobile traffic sensors For the time-space diagram of a single-lane one-way road, the vehicle trajectories do not intersect with each other unless there is a crash. Pneumatic tubes detect vehicle presence by sending an electric signal to a roadside device. B. Space mean speed may be greater than time mean speed in certain situations. A. True B. Falsearrow_forwardResults of traffic flow studies on a highway indicate that the flow-density relationship can be described by the expression. Uf2 q= = Ufk - k₁ If speed and density observations give the data shown below, develop an appropriate expression for speed versus density for this highway. (Use the following as necessary: k. Assume u is in mi/h and k is in veh/mi. Do not include units in your answer.) Speed (mi/h) Density (veh/mi) us 57 54 45 39 27 20 17 16 26 42 55 73 87 98 Determine the density (in veh/mi) at which the maximum volume will occur as well as the value of the maximum volume (in veh/h). density at maximum volume maximum volume veh/mi veh/harrow_forwardYour answer Question 2: A snowboarder starts from rest at the top of a double black 3 points diamond hill. As she rides down the slope, GPS coordinates are used to determine her displacement as a function of time given by the image below, where x and t are expressed in feet and seconds, respectively. Determine the displacement, average velocity, average speed and average acceleration for the time period from t=2 seconds to t=7 ft; v_avg = ft/s; seconds. Write your answer in the format (d = ft/s^2) * %3D V_sp = ft/s; a_av = x = 0.5t³ + t² + 2t Your answerarrow_forward
- A motorcyclist travels along a straight road. His velocity is shown in the v-t graph. A) Construct the s-t graph B) What is the total distance travelled?arrow_forwardA survey of spacings and headways on a road gave the following results: Headway Spacing (metres) (seconds) 51 3.4 69 2.5 63 3.7 47 3.2 64 3.8 62 2.4 51 3 55 What is the traffic flow in vehicles per hour? Your answer should be correct to the nearest integer.arrow_forward5. What is the meaning of a negative velocity v? Can an aircraft have a negative velocity vof say, -400 km/h? 6. You are driving an automobile along a straight road, and the speedometer registers 60 km.h (17m/s). Is the velocity positive or negative? What information do you need to answer this question?arrow_forward
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