Residential Construction Academy: House Wiring (MindTap Course List)
5th Edition
ISBN: 9781337402415
Author: Gregory W Fletcher
Publisher: Cengage Learning
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Chapter 9, Problem 15RQ
To determine
The number of steps required to have a wall switch placed at the top and bottom of the stairway to control interior stairway lighting and the NEC section that covers this wiring situation.
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1. Gunakan teor luasi momen untuk menentukan putaran sudut (slope) di B. Gunakan E =
200 GPa dan I-70 x 100 mm².
m
8 kN·m
B
2. Gunakan teori luas momen dan tentukan putaran sudut (slope) di A dan perpindahan di C.
Gunakan E = 200 GPa dan I = 70 x 100 mm².
4 kN
4 kN
-2 m
2 m-
B
4 m
4 m
Consider the conditions in Practice Problem 5.2. How short would the driver reaction times of oncoming vehicles have to be for the probability of an accident to equal 0.20?
Part 4: Problem-Solving. Solve the following problems. Show all calculations.
1. A Standard Penetration Test (SPT) was conducted at a site, and the following blow counts were
recorded:
Depth: 2 m, Blow count (N): 10
D
D
Depth: 4 m, Blow count (N): 15
Depth: 6 m, Blow count (N): 20
The energy ratio is 60%, and the overburden correction factor CN is 1.1. Calculate the
corrected N-values for each depth.
2. A soil sample was collected from a depth of 3 m using a Shelby tube. The sample had a volume
of 0.01 m³ and a mass of 18 kg. If the water content is 12%, calculate the (a) bulk density, (b) dry
density, and (c) void ratio of the soil. Assume the specific gravity of soil solids (Gs) is 2.65.
3. A Cone Penetration Test (CPT) was conducted at a site, and the following data was obtained:
Depth: 2 m, Cone resistance (qc): 5 MPa
Depth: 4 m, Cone resistance (qc): 8 MPa
Depth: 6 m, Cone resistance (qc): 12 MPa
Estimate the soil type at each depth using typical qc correlations.
Chapter 9 Solutions
Residential Construction Academy: House Wiring (MindTap Course List)
Ch. 9 - Prob. 1RQCh. 9 - Prob. 2RQCh. 9 - Prob. 3RQCh. 9 - The minimum amount of free conductor required at...Ch. 9 - Prob. 5RQCh. 9 - Describe how an insulated grounded conduct or...Ch. 9 - Describe how a white Insulated conductor in a...Ch. 9 - Prob. 8RQCh. 9 - Describe how a conductor that is larger than 6 AWG...Ch. 9 - Prob. 10RQ
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