EBK NUMERICAL METHODS FOR ENGINEERS
7th Edition
ISBN: 8220100254147
Author: Chapra
Publisher: MCG
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Chapter 12, Problem 26P
Electrical Engineering
An electrical engineer supervises the production of three types of electrical components. Three kinds of material-metal, plastic, and rubber-are required for production. The amounts needed to produce each component are
| Component | Metal, g/component |
Plastic, g/component |
Rubber, g/component |
| 1 | 15 | 0.30 | 1.0 |
| 2 | 17 | 0.40 | .2 |
| 3 | 19 | 0.55 | 1.5 |
If totals of 3.89, 0.095, and 0.282 kg of metal, plastic, and rubber, respectively, are available each day, how many components can be produced per day?
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Problem 2.3
The following problem can be solved using the generalized conservation and accounting
principle to determine if a recycling plant is profitable annually.
Operating information:
●
●
The plant operates 9 hours each day, 5 days each week, and 48 weeks each year.
The plant purchases 30 tons of aluminum (at a rate of $0.02/lb) during each operating
week.
The plant has 5 full-time employees who are paid $18 per hour. All employees work
during all of the plant's operating hours.
The plant produces 7 bales of recycled aluminum per day, which it sells for $950 per bale.
[Note: 1 ton = 2000 lb]
Answer the following questions:
(a) Identify the system (in words).
(b) Identify the "stuff" you are accounting for in this analysis.
(c) In order to determine the plant's annual profitability, would one be interested in studying
the instantaneous rate of change in "stuff" (i.e. rate form) or the total change in "stuff"
over an interval (i.e. finite-time form)?
(d) On a system diagram (hint:…
Problem 2.3
The following problem can be solved using the generalized conservation and accounting
principle to determine if a recycling plant is profitable annually.
Operating information:
●
●
The plant operates 9 hours each day, 5 days each week, and 48 weeks each year.
The plant purchases 30 tons of aluminum (at a rate of $0.02/lb) during each operating
week.
The plant has 5 full-time employees who are paid $18 per hour. All employees work
during all of the plant's operating hours.
The plant produces 7 bales of recycled aluminum per day, which it sells for $950 per bale.
[Note: 1 ton = 2000 lb]
Answer the following questions:
(c) In order to determine the plant's annual profitability, would one be interested in studying
the instantaneous rate of change in "stuff" (i.e. rate form) or the total change in "stuff"
over an interval (i.e. finite-time form)?
(d) On a system diagram (hint: think dashed lines!), use labeled arrows to identify each
individual input and output of "stuff".
(e)…
B.
2 m
Fg = 600 N
3.5 m
0.5 m
Fc= 450 N
1.5 m
1 m
0.5 m
1.5 m
Chapter 12 Solutions
EBK NUMERICAL METHODS FOR ENGINEERS
Ch. 12 - Chemical/Bio Engineering
12.1 Perform the same...Ch. 12 - Chemical/Bio Engineering If the input to reactor 3...Ch. 12 - Chemical/Bio Engineering Because the system shown...Ch. 12 - Chemical/Bio Engineering
12.4 Recompute the...Ch. 12 - Chemical/Bio Engineering Solve the same system as...Ch. 12 - Chemical/Bio Engineering
12.6 Figure P12.6 shows...Ch. 12 - Chemical/Bio Engineering
12.7 Employing the same...Ch. 12 - Chemical/Bio Engineering The Lower Colorado River...Ch. 12 - Chemical/Bio Engineering A stage extraction...Ch. 12 - Chemical/Bio Engineering
12.10 An irreversible,...
Ch. 12 - Chemical/Bio Engineering
12.11 A peristaltic pump...Ch. 12 - Chemical/Bio Engineering
12.12 Figure P12.12...Ch. 12 - Civil/Environmental Engineering A civil engineer...Ch. 12 - Civil/Environmental Engineering Perform the same...Ch. 12 - Civil/Environmental Engineering
12.15 Perform the...Ch. 12 - Civil/Environmental Engineering Calculate the...Ch. 12 - Civil/Environmental Engineering In the example for...Ch. 12 - Civil/Environmental Engineering Employing the same...Ch. 12 - Civil/Environmental Engineering Solve for the...Ch. 12 - Prob. 20PCh. 12 - Prob. 21PCh. 12 - Civil/Environmental Engineering
12.22 A truss is...Ch. 12 - Electrical Engineering
12.23 Perform the same...Ch. 12 - Electrical Engineering Perform the same...Ch. 12 - Electrical Engineering
12.25 Solve the circuit in...Ch. 12 - Electrical Engineering
12.26 An electrical...Ch. 12 - Electrical Engineering
12.27 Determine the...Ch. 12 - Electrical Engineering Determine the currents for...Ch. 12 - Electrical Engineering The following system of...Ch. 12 - Electrical Engineering
12.30 The following system...Ch. 12 - Mechanical/Aerospace Engineering Perform the same...Ch. 12 - Mechanical/Aerospace Engineering
12.32 Perform the...Ch. 12 - Mechanical/Aerospace Engineering
12.33 Idealized...Ch. 12 - Mechanical/Aerospace Engineering Three blocks are...Ch. 12 - Mechanical/Aerospace Engineering Perform a...Ch. 12 - Mechanical/Aerospace Engineering Perform the same...Ch. 12 - Mechanical/Aerospace Engineering
12.37 Consider...Ch. 12 - Mechanical/Aerospace Engineering The steady-state...Ch. 12 - Mechanical/Aerospace Engineering
12.40 A rod on a...
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