SMT 314 - Introduction to Cosmology » Fall 2020 » HW4 Part 1

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Question #1
During winter, the North Pole has how many hours of sunlight?
A.   it varies year to year
B.   24 hours
C.   0 hours
D.   12 hours
Question #2
Earth's Moon revolves:
A.   never. It also doesn't revolve about anything.
B.   never, because the same face always faces Earth.
C.   roughly once a month
D.   once an Earth day
Question #3
Equinoxes have exactly 12 hours of sunlight and 12 hours of night.
A.   TRUE
B.   FALSE
Question #4
Critical Thinking (you probably won't be able to Google the answer): If the tilt of the Earth's rotation axis were 40° instead of 23.5°, which of the following statement regarding what an observer at latitude 40° would experience would be false?
A.   Summer days would be even hotter, on average.
B.   The Sun would pass essentially overhead (the zenith) around June 22, the summer solstice.
C.   There would be a longer combined spring and summer period.
D.   The days and nights would each remain roughly 12 hours long around March 22 and September 22, the equinoxes.
E.   The summer would have even longer days and even shorter nights.
Question #5
Select all correct answers: December 21-22 is:,,
A.   when the north pole is pointed away from Polaris
B.   the longest day of the year in the southern hemisphere
C.   the shortest day of the year in the southern hemisphere
D.   3 - 4 days before Christmas
E.   the Summer Solstice in the southern hemisphere
F.   the Summer Solstice in the Northern Hemisphere
Question #6
Which one of the following is the main reason why Earth has seasons?
A.   It has seasons so that sunbathers will know when to go to the beach, and skiers will know when to go skiing.
B.   The tilt of Earth's axis of rotation causes the Sun to pass higher in the sky during the day in one hemisphere than in the other, thereby giving more daylight hours and more heating per hour per surface area.
C.   Earth's orbit is elliptical.  We have summer when we are closer to the Sun and winter when we are farther from the Sun.
D.   Over the course of the Year, the tilt of Earth's axis of rotation varies from 23.5° to 0° in such a way as to bring more heating per hour in the summer than the winter.
E.   The tilt of Earth's axis of rotation causes one hemisphere of the planet to be substantially closer to the Sun during the day than the other hemisphere.  Because it is closer to the Sun, it receives much more solar energy per hour.
Question #7
Which phase of the Moon comes 3 days before or after the New Moon?
A.   crescent
B.   gibbous
C.   Full Moon
D.   quarter
Question #8
Winter Solstice in the Southern Hemisphere is on what date?
A.   March 20-21
B.   June 20-21
C.   December 20-21
D.   September 21-22
Question #9
As observed from Earth, Jupiter sometimes appears to be in the crescent phase. (If you aren't sure, check out https://vsutv.valdosta.edu/astro_demos/frameset_seasons.html & select "The Plane of the Solar System.")
A.   FALSE
B.   TRUE
Question #10
Completing the Lunar Phases worksheet before answering this question, will make answering the question easier. Suppose the Mandalorian is standing on Earth and baby Yoda is on the Moon. The Moon is in the first quarter phase (as seen from the Earth). The Sun is directly overhead as seen by both the Mandalorian and baby Yoda. If they both have fantastic telescopes, can they see each other wave at the other?
A.   FALSE
B.   TRUE
Question #11
Completing the Lunar Phases worksheet before answering this question, will make answering the question easier. You are on the Moon. If the Moon, as seen from the Earth, is in the waning crescent phase, what phase of the Earth would you see from the Moon?
A.   Waning cresent
B.   Full
C.   The Earth's phases as seen from the Moon are unrelated to the Moon's phases as seen from the Earth.
D.   The Earth does not go through phases as seen from the Moon.
E.   Waxing gibbous

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