SPST201 quiz 4
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School
American Public University *
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Course
201
Subject
Aerospace Engineering
Date
Apr 3, 2024
Type
Pages
4
Uploaded by 32denny
Quiz 4 - Results
Attempt 1 of 1
Written Dec 29, 2023 2:51 PM - Dec 29, 2023 3:42 PM
Attempt Feedback
Attempt Score
98 / 105 - 93.33 %
Overall Grade (Highest Attempt)
98 / 105 - 93.33 %
Question 1
7 / 7 points
___
Sidereal___ ___
Time___
Question 2
7 / 7 points
___
specific___ ___
mechanical___ ___
energy___
Question 3
7 / 7 points
According to the authors, each of the following are key angles for launch geometry
except
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for every problem. I left feedback for missed questions.
is the angle between a longitudinal line and the vernal
equinox
Whenever we add or subtract velocity, we change the orbit's
Question 4
6.999 / 7 points
___
size___
___
semimajor___ ___
axis___
Question 5
7 / 7 points
During liftoff, a launch vehicle goes through four distinct phases on its way from the
pad to its orbit. Name these 4 phases.
Question 6
0 / 7 points
If the right ascension of the ascending node = 45 deg, what is LWST? If the local time
is 1200, how long must we wait until the next launch opportunity, assuming there is
only one opportunity per day?
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Launch azimuth
Right ascension of the ascending node
Inclination auxiliary angle
Launch site latitude
Specific mechanical energy changes an orbit's or
The 4 Phases are:
1. Vertical Ascent
2. Pitch Over
3. Gravity Turn
4. Vacuum Phase
The LWST is 45 degrees. We assume there is one opportunity per day and the RAAN
is 45 degrees, the next launch opportunity is happening at the same time as the
current local time 1200. There is no need to wait, the next launch opportunity is
currently happening.
LWST = 45 degrees + 90 degrees= 135degrees
135degrees divided by 15 degrees per hour = 0900 hours
Question 7
7 / 7 points
For a launch site window to exist at a given launch site, the latitude of the launch site
must be greater than or equal to the inclination of the desired orbit.
True
False
Question 8
7 / 7 points
___
increase___
___
increasing___
Question 9
7 / 7 points
___
decrease___
___
decreasing___
Question 10
7 / 7 points
Hohmann transfers are the most expensive way to get from one orbit to another.
True
False
Question 11
7 / 7 points
If the launch site's latitude is less than the orbital inclination, how many launch
opportunities will we have each day? Where/when will these opportunities be?
From 12:00 pm to 9:00 am is 21 hours of wait time
Therefore the LWST is 0900 and we wait 21hours for the next launch opportunity
If we want to move the spacecraft to a higher orbit, we have to the
semimajor axis by velocity.
To move the spacecraft to a lower orbit, we
the semimajor axis by the velocity
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Question 12
7 / 7 points
Time can be measured in degrees as well as in hours.
True
False
Question 13
7 / 7 points
___
lead___ ___
angle___
Question 14
7 / 7 points
___
launch___ ___
window___ ___
sidereal___ ___
time___
Question 15
7 / 7 points
How do you calculate mean solar time?
Done
If the launch-site latitude is less than the orbital inclination, we have two
opportunities each day. Once near the ascending node and once near the
descending node
The is the angular distance the target spacecraft travels
during the interceptor's time of flight
The is measured from the
vernal equinox direction to the point where the launch site passes through the orbital
plane
We calculate mean solar time by taking the annual average of the times between the
Sun's successive passes over a point on Earth