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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Chapter 5, Problem 6RQ
- 6. In 1978, cars that got about 40 miles per gallon were readily available. If the average fuel economy of all cars sold since then was 40 miles per gallon (instead of the lower average mileage of the cars that were actually sold), how many billions of gallons of gas would have been saved in the United States since 1978?
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A city has a fleet of 10 gasoline cars and 5 gasoline light trucks built in 2009. The annual vehicle miles (VMT) traveled by these vehicles are 8,000 miles. How many kg of CO2e does the fleet produces in a year? Which fleet of vehicles (i.e. light truck or gasoline car) produces more CO2e and by how much?
Notes:
Fuel efficiency of gasoline car = 23.8 mpg
Fuel efficiency of light truck = 17.4 mpg
Emission factor of N2O from gasoline car = 0.020 gm/mile
Emission factor of CH4 from gasoline car = 0.021 gm/mile
Emission factor of N2O from light truck= 0.029 gm/mile
Emission factor of CH4 from light truck = 0.025 gm/mile
Emission factor of gasoline = 8.78 kg CO2/gallon
Linda and Jerry are faced with a car replacement opportunity where an interest rate can be ignored. Jerry’s old clunker that averages 10 miles per gallon (mpg) of gasoline can be traded in toward a vehicle that gets 15 mpg. Or, as an alternative, Linda’s 25 mpg car can be traded in toward a new hybrid vehicle that averages 50 mpg. If they drive both cars 12,000 miles per year and their goal is to minimize annual gas consumption, which car should be replaced—Jerry’s or Linda’s? They can only afford to upgrade one car at this time.
1. A 6-cylinder, 4-stroke marine diesel engine generally operates
at 3000 revolutions per minute with a fuel consumption of 650
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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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