Thinking Like an Engineer: An Active Learning Approach (4th Edition)
4th Edition
ISBN: 9780134639673
Author: Elizabeth A. Stephan, David R. Bowman, William J. Park, Benjamin L. Sill, Matthew W. Ohland
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 11RQ
- 11. How many carrots are used to make all of the canned soup consumed in the United States in one year? How many acres are used to grow these carrots?
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9. If machine parts are degreased by means of kerosene as shown in the diagram,
how much kerosene make-up is needed per day? How much kerosene has to enter
the degreasing vat per day? There are about 3 lb of grease per 100 lb of machine
parts, and 60 tons of machine parts are processed each day. Five thousand pounds
of kerosene (the 10% solution) are carried away by the machine parts each day
but drip off and are caught and put back in the degreasing vat. Two hundred
pounds of the 10% solution are lost each day from the vat by evaporation, spillage,
or by being carried away.
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)…
Chapter 5 Solutions
Thinking Like an Engineer: An Active Learning Approach (4th Edition)
Ch. 5.6 - Determine the number of significant figures and...Ch. 5.6 - Express the answer to the following, using the...Ch. 5.7 - In each of the following cases, a value of the...Ch. 5.8 - Prob. 4CCCh. 5 - a. If estimating the amount of time to design a...Ch. 5 - In each of the following cases, either display a...Ch. 5 - In each of the following cases, either display a...Ch. 5 - In each of the following cases, a value of some...Ch. 5 - Complete the table to express each of the...Ch. 5 - Use estimation to solve these Fermi-type problems....
Ch. 5 - 2. How many gallons of gasoline are burned per...Ch. 5 - 3. If all the land (both currently inhabited and...Ch. 5 - 4. How many times do my rear tires rotate if I...Ch. 5 - 5. How many gallons of water per day would be...Ch. 5 - 6. In 1978, cars that got about 40 miles per...Ch. 5 - 7. How many toothpicks can be made from an...Ch. 5 - 8. Noahs ark has been described as having the...Ch. 5 - Prob. 9RQCh. 5 - 10. A cubic meter of air has a mass of about 1.2...Ch. 5 - 11. How many carrots are used to make all of the...
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