Welcome to Exercise 6: Fossil Fuels (& Driving Hazards) We humans are not very g
ID: 156054 • Letter: W
Question
Welcome to Exercise 6: Fossil Fuels (& Driving Hazards)
We humans are not very good at imagining the invisible. You just exhaled some carbon dioxide. Wait, there, you did it again. And again. So did I. Did you see it going? In this exercise, you'll do a simple calculation that we hope will help you visualize some of the things we do that matter. Remember to read the introduction and watch the video (opens in a pop-up window) before you get started.
You will only get one chance to submit this exercise so be sure to review your answers carefully before submission. You can, however, save your answers as long as you do not submit them first. Do not forget to hit the submit button when you are finished. This exercise will NOT automatically submit since there is no time limit (except to submit it by the due date shown on the calendar). This exercise will be graded automatically.
Don't forget to look at the introduction and video before you begin answering the next six questions.
1.
A gallon of milk weighs eight pounds, so you wouldn
Welcome to Exercise 6: Fossil Fuels (& Driving Hazards)
We humans are not very good at imagining the invisible. You just exhaled some carbon dioxide. Wait, there, you did it again. And again. So did I. Did you see it going? In this exercise, you'll do a simple calculation that we hope will help you visualize some of the things we do that matter. Remember to read the introduction and watch the video (opens in a pop-up window) before you get started.
You will only get one chance to submit this exercise so be sure to review your answers carefully before submission. You can, however, save your answers as long as you do not submit them first. Do not forget to hit the submit button when you are finished. This exercise will NOT automatically submit since there is no time limit (except to submit it by the due date shown on the calendar). This exercise will be graded automatically.
Don't forget to look at the introduction and video before you begin answering the next six questions.
1.
A gallon of milk weighs eight pounds, so you wouldn
Explanation / Answer
1. Ans. D. 600 gallons / year
12000 miles/ 20 = 600 gallons / year
2. Ans. A. 3,600 pounds / year
6 pounds per gallon of gasoline
600 x 6 = 3600 pounds
3. Ans. B. 1,080 pounds / year
a typical U.S. driver is three times larger than the weight of gasoline burned
3600 x 3 = 10800 pounds / year
4. Ans. C. 1,680,000,000,000 pounds / year (or 840,000,000 tons )
There are roughly 140,000,000 cars in the country
Each car averages 12,000 miles per year
Each car is producing @ 1 pound of CO2 per car per mile
140000000 x 12000 x 1 = 1680000000000 pound / year
2000 lbs = 1 ton
1680000000000/2000 = 840000000 tons
Q. 5 Ans. D. 4 pounds per square foot / year
Number of pounds of CO2 per year produced by U.S. cars divided by the total highway square footage number
1680000000000/420000000000 = 4 pounds per square foot / year
Q. 6. Ans. C. 1 inch
The CO2 from our cars, if turned to horse ploppies, would make a one-inch-thick layer spread across all the paved roads in the entire country each year.
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