Solution and Answer Guide: Moaveni, Engineering Fundamentals: An Introduction to Engineering 7e, 2024, 9780357684412;
Chapter 1: Introduction to the Engineering Profession
Solution and Answer Guide
Moaveni, Engineering Fundamentals: An Introduction to Engineering 7e, 2024, 9780357684412;
Chapter 1: Introduction to the Engineering Profession
End of Section Problem Solutions
Note: Some solutions are not provided due to the nature of the problems.
1.20 Estimate the amount of copy or printing paper that you use every year. A 500-sheet
ream of copy paper has an approximate mass of 5 pounds (2.27 kg). How much of
this consumption is truly necessary, and how much of your own paper consumption
could be avoided? State your assumptions.
SOLUTION
For example, on average, if you use 15 pages per day; then on a yearly basis, you
use 5475 pages (15 x 365).
5475 pages 5 pounds pounds of paper
( )( ) = 54.75
year 500 pages year
- Print only when necessary; convert online articles, emails, online receipts, etc., to
PDF and save them electronically. Submit reports electronically when appropriate.
- If you have to print, print on both sides of the paper.
1.21 In many parts of the world, it is expected that internal combustion engines will
remain in use for at least another 20 years. We can reduce the amount of CO2
released into the atmosphere by driving our cars less. What would be the reduction
in pounds of CO2 released into the atmosphere by a car that is driven 10,000 miles
(16,000 km) per year instead of 12,000 miles (19,000 km) per year? State your
assumptions.
© 2024 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 1-1
website, in whole or in part.
, Solution and Answer Guide: Moaveni, Engineering Fundamentals: An Introduction to Engineering 7e, 2024, 9780357684412;
Chapter 1: Introduction to the Engineering Profession
SOLUTION
Twenty pounds of CO2 is released into the atmosphere for every gallon of gasoline
burned. Assuming an average fuel economy of 25 mpg, then
reduction in the amount of CO2
miles gallon 20 pounds of CO2
= (12,000 - 10,000) � �� �� �
year 25 miles gallon
= 1600 pounds of CO2 per year
1.22 The U.S. Federal Highway Administration’s recent data regarding the average annual
miles driven per driver by age group is shown in the accompanying table. Assuming
an average fuel economy of 25 miles per gallon, calculate the amount of CO2
released into the atmosphere by gender and age group. Present your results in a
similar tabular form.
© 2024 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 1-2
website, in whole or in part.
, Solution and Answer Guide: Moaveni, Engineering Fundamentals: An Introduction to Engineering 7e, 2024, 9780357684412;
Chapter 1: Introduction to the Engineering Profession
SOLUTION
The amount of CO2 released into the atmosphere, in pounds, is given by the following
1 gallon 20 pounds of CO2
formula: (average annual miles) �25 miles� � 1 gallon
�
(unit: pound)
Age Male Female Average
16–19 6,565 5,498 6,099
20–34 14,381 9,603 12,078
35–54 15,086 9,171 12,233
55–64 12,687 6,224 9,578
65+ 8,243 3,828 6,117
Average 13,240 8,114 10,781
1.24 A car-wash system consumes 60 gallons of water per wash. Assuming that a person
washes their car once every week, what is the total amount of water consumed
annually by this activity?
SOLUTION
60 gallons 1 wash 52 weeks
amount of water consumed per year = � �� �� �
1 wash week year
= 3120 gallons per year
1.25 Imagine 100 million adults who will live another 65 years. Also assume that each
person will use 0.27 m3 of water every day on average. How much water would be
consumed by this population over their expected remaining lives?
© 2024 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 1-3
website, in whole or in part.
, Solution and Answer Guide: Moaveni, Engineering Fundamentals: An Introduction to Engineering 7e, 2024, 9780357684412;
Chapter 1: Introduction to the Engineering Profession
SOLUTION
amount of water consumed
0.27 m3 365 days
= �100 ×106 people� � �� � (65 years)
day 1 year
1000 liters
= 6.4 ×1011 m3 of water = �6.4 ×1011 � (m3 ) � 3
� = 6.4×1014 liters of water
m
1 gallon
= �6.4 ×10 � (liters) �
14
� = 170 ×10 gallons
12
3.78 liters
= 170 trillion gallons of water
1.26 Assuming that a large family’s dishwasher uses 10 gallons of water per wash three
times a week, what is the total amount of water consumed by the dishwasher in a
year?
SOLUTION
10 gallons 3 washes 52 weeks
amount of water consumed per year = � �� �� �
1 wash week year
= 1560 gallons per year
© 2024 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 1-4
website, in whole or in part.
Chapter 1: Introduction to the Engineering Profession
Solution and Answer Guide
Moaveni, Engineering Fundamentals: An Introduction to Engineering 7e, 2024, 9780357684412;
Chapter 1: Introduction to the Engineering Profession
End of Section Problem Solutions
Note: Some solutions are not provided due to the nature of the problems.
1.20 Estimate the amount of copy or printing paper that you use every year. A 500-sheet
ream of copy paper has an approximate mass of 5 pounds (2.27 kg). How much of
this consumption is truly necessary, and how much of your own paper consumption
could be avoided? State your assumptions.
SOLUTION
For example, on average, if you use 15 pages per day; then on a yearly basis, you
use 5475 pages (15 x 365).
5475 pages 5 pounds pounds of paper
( )( ) = 54.75
year 500 pages year
- Print only when necessary; convert online articles, emails, online receipts, etc., to
PDF and save them electronically. Submit reports electronically when appropriate.
- If you have to print, print on both sides of the paper.
1.21 In many parts of the world, it is expected that internal combustion engines will
remain in use for at least another 20 years. We can reduce the amount of CO2
released into the atmosphere by driving our cars less. What would be the reduction
in pounds of CO2 released into the atmosphere by a car that is driven 10,000 miles
(16,000 km) per year instead of 12,000 miles (19,000 km) per year? State your
assumptions.
© 2024 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 1-1
website, in whole or in part.
, Solution and Answer Guide: Moaveni, Engineering Fundamentals: An Introduction to Engineering 7e, 2024, 9780357684412;
Chapter 1: Introduction to the Engineering Profession
SOLUTION
Twenty pounds of CO2 is released into the atmosphere for every gallon of gasoline
burned. Assuming an average fuel economy of 25 mpg, then
reduction in the amount of CO2
miles gallon 20 pounds of CO2
= (12,000 - 10,000) � �� �� �
year 25 miles gallon
= 1600 pounds of CO2 per year
1.22 The U.S. Federal Highway Administration’s recent data regarding the average annual
miles driven per driver by age group is shown in the accompanying table. Assuming
an average fuel economy of 25 miles per gallon, calculate the amount of CO2
released into the atmosphere by gender and age group. Present your results in a
similar tabular form.
© 2024 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 1-2
website, in whole or in part.
, Solution and Answer Guide: Moaveni, Engineering Fundamentals: An Introduction to Engineering 7e, 2024, 9780357684412;
Chapter 1: Introduction to the Engineering Profession
SOLUTION
The amount of CO2 released into the atmosphere, in pounds, is given by the following
1 gallon 20 pounds of CO2
formula: (average annual miles) �25 miles� � 1 gallon
�
(unit: pound)
Age Male Female Average
16–19 6,565 5,498 6,099
20–34 14,381 9,603 12,078
35–54 15,086 9,171 12,233
55–64 12,687 6,224 9,578
65+ 8,243 3,828 6,117
Average 13,240 8,114 10,781
1.24 A car-wash system consumes 60 gallons of water per wash. Assuming that a person
washes their car once every week, what is the total amount of water consumed
annually by this activity?
SOLUTION
60 gallons 1 wash 52 weeks
amount of water consumed per year = � �� �� �
1 wash week year
= 3120 gallons per year
1.25 Imagine 100 million adults who will live another 65 years. Also assume that each
person will use 0.27 m3 of water every day on average. How much water would be
consumed by this population over their expected remaining lives?
© 2024 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 1-3
website, in whole or in part.
, Solution and Answer Guide: Moaveni, Engineering Fundamentals: An Introduction to Engineering 7e, 2024, 9780357684412;
Chapter 1: Introduction to the Engineering Profession
SOLUTION
amount of water consumed
0.27 m3 365 days
= �100 ×106 people� � �� � (65 years)
day 1 year
1000 liters
= 6.4 ×1011 m3 of water = �6.4 ×1011 � (m3 ) � 3
� = 6.4×1014 liters of water
m
1 gallon
= �6.4 ×10 � (liters) �
14
� = 170 ×10 gallons
12
3.78 liters
= 170 trillion gallons of water
1.26 Assuming that a large family’s dishwasher uses 10 gallons of water per wash three
times a week, what is the total amount of water consumed by the dishwasher in a
year?
SOLUTION
10 gallons 3 washes 52 weeks
amount of water consumed per year = � �� �� �
1 wash week year
= 1560 gallons per year
© 2024 Cengage. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible 1-4
website, in whole or in part.
