SPST201 quiz 4

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School

American Public University *

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Course

201

Subject

Aerospace Engineering

Date

Apr 3, 2024

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pdf

Pages

4

Uploaded by 32denny

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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 This is a very good score. If desired, schedule a meeting with me via email or Microsoft Teams to go over this assignment. Make sure you know how to get the correct answer 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? Hide ques±on 6 feedback 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