Solid Waste Engineering
3rd Edition
ISBN: 9781305635203
Author: Worrell, William A.
Publisher: Cengage Learning,
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Textbook Question
Chapter 7, Problem 7.10P
Cellulose is to be burned in a waste-to- energy fadlity. The chemical equation for cellulose C6 H10O5is the atomic weights of C, H, and O are 12, 1, and 16. respectively.
a. Calculate the stoichiometric oxygen necessary for the combustion of cellulose.
b. Calculate stoichiometric air.
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Directions: Show your solutions explicitly, I.e., do not just write the final answer. Always simplify and box your final
answer.
1. A wall footing is to be constructed on a clay soll 1.4 below the ground. The footing is to support a wall that
imposes a load of 130 kN per meter of wall length. Considering general shear failure, determine the following:
130 kN/m
4m
a. Footing width if the factor of safety is 3.
b. Ultimate bearing capacity if B = 0.95 m.
c. New factor of safety.
Y = 17.92 kN/m²
c = 14.5 kPa
$ -30°
2. A square footing shown has a dimension of 1.5 mx 1.5 m and has its bottom 2 m below the ground surface.
The groundwater table is located at a depth of 3 m below the ground surface. Assume a general shear failure.
Determine the following:
L
2 m
y = 16 kN/m³
c = 14.5 kPa
= 28°
3 m
1.5 m
Ysa1 = 18.5 kN/m³
a. Ultimate bearing capacity of the soll beneath the footing (in kPa).
b. Allowable bearing capacity if it has a factor of safety of 3 (in kPa).
C. Allowable load that the…
B2. For the truss below, determine all member forces. Hint: see the provided slide with the
problem set. P₁ = 12 kip and P₂ = 6 kip (20 pts).
P₁
16 ft
D
8 ft
8 ft
8 ft
B
K
E
8 ft
8 ft
8 ft
H
8 ft
В
G
1000
8 ft
14.1 A beam of rectangular cross section is 125 mm wide
and 200 mm deep. If the maximum bending moment
is 28.5 kN⚫m, determine (a) the maximum tensile and
compressive bending stress, and (b) the bending stress
25 mm from the top of the section.
14.2 A rectangular beam 50 mm wide and 100 mm deep is
subjected to bending. What bending moment will
cause a maximum bending stress of 137.9 MN/m²
(MPa)?
14.3 Determine the bending moment in a rectangular
beam 3 in. wide and 6 in. deep if the maximum bend-
ing stress is 15,000 psi.
Chapter 7 Solutions
Solid Waste Engineering
Ch. 7 - Prob. 7.1PCh. 7 - The ideal equation for the combustion of cellulose...Ch. 7 - You serve as the president of XYZ corporation,...Ch. 7 - Prob. 7.4PCh. 7 - Prob. 7.5PCh. 7 - Prob. 7.6PCh. 7 - Prob. 7.7PCh. 7 - Prob. 7.8PCh. 7 - Prob. 7.9PCh. 7 - Cellulose is to be burned in a waste-to- energy...
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