Residential Construction Academy: House Wiring (MindTap Course List)
5th Edition
ISBN: 9781337402415
Author: Gregory W Fletcher
Publisher: Cengage Learning
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Chapter 7, Problem 15RQ
To determine
The minimum size copper grounding electrode conductor for 200 ampere service entrance which is installed with 4/0 aluminium wire.
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Given a small town with three transportation analysis zones and origin-destination survey results, provide a trip distribution calculation using the gravity model for two iterations; assume Kij = 1. The following table shows the number of productions and attractions in each zone.
Zone
1
2
3
Total
Productions 250
480
270
1,000
Attractions
435
180
385
1,000
The survey's results for the zones' travel time in minutes were as follows.
To
Zone
1
2
3
1
6
4
2
From
2
2
8
3
3
1
3
5
The following table shows travel time versus friction factor.
Time (min)
1
2
3
4
5
6
7
8
Friction Factor
82
52
50
41
39
26
20
13
Compute the trip distribution calculations for the first iteration.
Zone-to-Zone Trips: First Iteration
To
Zone
1
2
3
Computed P
Given P
1
From
2
3
Computed A
Given A
Compute the trip distribution calculations for the second iteration.
Zone-to-Zone Trips: Second Iteration
To
Zone
1
2
3
Computed P
Given P
1
From
2
3
Computed A
Given A
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The Jeffersonville Transportation Study area has been divided into four traffic zones. The following data have been compiled.
Travel Time (min)
District
Productions
Attractions
1
2 3 4
1
3,000
3,000
5
8
12
15
2
1,000
400
8
5
10
8
3
2,000
4,500
12
10
5
7
4
2,500
600
15
8
7
5
Travel Time
1
5
6
7
8
10
12
15
Fij
2.00 1.30
1.10
1.00
0.95
0.85
0.80
0.65
After the first iteration, the trip table was as follows.
District
1
2
3
4
Ps
1
1,415
138
2
367
67
1,306 141
493
73
3
522
4
641
74
125
As
2,945 404
1,478 256
4,550 601
3,000
1,000
1,273 131 2,000
2,500
Complete the second iteration.
District
1
2
3
4
Computed A
1
2
3
4
Computed P
3. The 200-kg, 5 m-wide rectangular gate shown in Fig. I is hinged at B and leans against
the floor at A making an angle of 45° with the horizontal. The gate is to be opened from
its lower edge by applying a normal force at its center. Determine the minimum force R
required to open the water gate.
2
Water
Fig. 1 1450
3.5mm
R
Chapter 7 Solutions
Residential Construction Academy: House Wiring (MindTap Course List)
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