Module 9 - Concept Check: PHYS 123 Science of Flight - Oct 2023 - Online 2
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School
Embry-Riddle Aeronautical University *
*We aren’t endorsed by this school
Course
123
Subject
Aerospace Engineering
Date
Jan 9, 2024
Type
Pages
11
Uploaded by AmbassadorFogZebra6
Due
Dec 17 at 8:59pm
Points
100
Questions
13
Available
Dec 10 at 9pm - Dec 17 at 8:59pm
Time Limit
None
Allowed Attempts
2
Instructions
The purpose of the concept checks is to evaluate your grasp of the basic module
content and to allow you to practice written communication, quantitative reasoning,
problem-solving, and real-world application.
The concept checks are untimed open book/open notes quizzes, containing
multiple-choice, matching, numerical answer questions, that will focus on your
comprehension, application, and analysis of the material.
Quiz questions are presented one at a time. Use caution
in navigating back to a previous question
– answers are only saved by selecting Save or navigating forward to the next question.
Attempts: You will have two attempts; the higher scoring attempt will be your final score. Questions
are pooled, so you will not see the same questions on different attempts.
Time limit:
None
Grading:
All questions are scored immediately after quiz submission. Quiz Review:
You will be able to review the quiz questions, your answers, and automatic
feedback once
, immediately after submitting the quiz. Incorrect answers will be marked, but the
correct answers to those questions will not be shown. Contact your instructor for clarification on
incorrect answers if needed.
Tips for Success
Review all content and resources provided in the module lesson.
Ask questions. Use the Online Office or email your instructor.
Even though the quiz is not due until the end of the module, preparing for and taking the first
attempt early in the module is highly recommended. Immediately after submitting the first
attempt, you will have one opportunity to review your submission to see which questions you got
wrong. Taking the first attempt early allows time to seek or ask for clarification on the wrong
answers prior to taking the second attempt.
Knowledge Assessment
This activity supports Module Objectives 1-7 and Learning Outcomes 2 and 9.
(https://erau.instructure.com/courses/164450/pages/module-9-overview-and-objectives)
Module 9
Concept Check
Attempt History
Attempt
Time
Score
KEPT
Attempt 2 11 minutes
84 out of 100
LATEST
Attempt 2 11 minutes
84 out of 100
Attempt 1 54 minutes
84 out of 100
Correct answers are hidden.
Score for this attempt: 84
out of 100
Submitted Dec 17 at 5:13pm
This attempt took 11 minutes.
7 / 7 pts
Question 1
Answer 1:
Answer 2:
The [ Select ]
of a sound wave measures the
sound's loudness, while the [ Select ]
of a sound
wave measures the sound's pitch.
amplitude, or intensity frequency 7 / 7 pts
Question 2
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Unlike sound waves, light waves do not require a medium and can
propagate in the vacuum of space.
True False 8 / 8 pts
Question 3
What are two
physical
pollutants that result from the aviation industry? carbon dioxide light mercury noise 8 / 8 pts
Question 4
Lead can _________, meaning organisms can capture and store lead in
their body. transmutate cycle
bioaccumulate multiply 8 / 8 pts
Question 5
Answer 1:
Due to aviation-related NOx emissions that generate tropospheric
ozone, many large U.S. airports violate the associated NAAQS, making
airport expansion difficult due to regulatory hurdles. tropospheric 8 / 8 pts
Question 6
Which of the following statements regarding tropospheric ozone is
FALSE
?
safe levels of tropospheric ozone have been established by the EPA to
protect human and environmental health
there have been significant decreases in tropospheric ozone
concentrations in recent decades
there are no US locations currently demonstrating average
concentrations of tropospheric ozone above safe levels
tropospheric ozone has been a stubborn pollutant 8 / 8 pts
Question 7
How does particulate matter form in aircraft engines? reaction of atmospheric oxygen with UV light. reaction of atmospheric nitrogen and oxygen in high temperature and
pressure of the engine
incomplete combustion of hydrocarbons reaction of sulfur in jet fuel with atmospheric oxygen 8 / 8 pts
Question 8
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Based on the graph below, what conclusion(s) can be drawn regarding
tropospheric ozone in the U.S.? (select all that apply)
Regulatory action resulted in a significant decline in tropospheric ozone
concentrations in the U.S. in the late 1990s.
The average tropospheric ozone concentration has been gradually
decreasing in the last several decades.
The average tropospheric ozone concentrations sometimes exceed the
NAAQS.
Tropospheric ozone mitigation strategies are effective at achieving
NAAQS.
7 / 7 pts
Question 9
The ICAO established an agreement between 65 member states to
address global greenhouse gas emissions from aviation. Which statement below best describes CORSIA: Pollution taxation scheme to penalize countries based on percent
contribution to GHG emissions.
Carbon offset program to cap net GHG emissions from international
flights.
International agreement to reduce greenhouse gas emissions from
international aviation among the member states by 33% by 2023.
Cap and trade scheme to reduce greenhouse gas emissions from
international aviation.
7 / 7 pts
Question 10
What is the most prevalent greenhouse gas in Earth's atmosphere? methane CFCs nitrous oxide water vapor carbon dioxide 0 / 8 pts
Question 11
Incorrect
Incorrect
Which statement most accurately reflects the findings of the Travis et al
study (2002) regarding contrails? Contrails trap greenhouse gases, increasing local effects of greenhouse
gases.
Contrails block solar radiation in the daytime, reducing the high
temperature for the 24 hour period; contrails radiate heat at night,
increasing the low temperature for the 24 hour period.
The influence of contrails on climate is so small it cannot be reliably
measured.
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Contrails trap infrared heat radiated from Earth's surface, increasing
surface temperatures slightly.
Refer to the Module 9 Lesson "Aviation and Climate."
8 / 8 pts
Question 12
1. Warmer air temperatures decrease engine performance.
2. Warmer air temperatures increase density altitude.
Neither 1 nor 2 are true. Only 2 is true. Only 1 is true. Both 1 and 2 are true. 0 / 8 pts
Question 13
Incorrect
Incorrect
What is the major factor preventing widespread use of alternative jet
fuels? cost of production fuel stability
fuel compatibility with modern engines Alternative jet fuels currently being developed are compatible with
existing aircraft and fuel infrastructure. octane rating Refer to the Module 9 Lesson "Aircraft Engine Emissions."
Quiz Score: 84
out of 100