Exam 1 Study Questions Flashcards

Example Questions

1
Q
What time does the 3rd quarter moon rise? (Assuming you're observing from HPU)
A. Sunset (~6pm)
B. Midnight (12am)
C. Noon (12pm)
D. Sunrise (~6am)
A

B. Midnight (12am)

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2
Q

Which of the following do NOT constitute a good scientific hypothesis? Select all that apply.
A. There is a group of particles in the Universe called “whatevertrons” that are invisible, but they do interact with matter gravitationally (they tug on other objects because of their gravity)
B. The universe is actually part of a “Multiverse” (set of multiple universes) with which we can have no contact at all.
C. The moon is made entirely of cheese.
D. There is a group of particles in the Universe called “invisitrons” that are undetectable in every way possible (invisible, doesn’t interact with light or matter, etc.).
E. The Earth is flat.

A

B. The universe is actually part of a “Multiverse” (set of multiple universes) with which we can have no contact at all.
D. There is a group of particles in the Universe called “invisitrons” that are undetectable in every way possible (invisible, doesn’t interact with light or matter, etc.).

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3
Q
Looking West at sunset, you notice a bright planet close to the Sun in the sky. The next night, you find that the planet has moved WESTWARD with respect to the background stars. Which planet(s) could you be looking at? Select all that apply.
A. Saturn
B. Mercury
C. Mars
D. Venus
E. Jupiter
A

B. Mercury

D. Venus

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4
Q

Which list of moon phases below is in the correct chronological order, when read from left to right?
A. New Moon, Full Moon, 1st Quarter, 3rd Quarter
B. New Moon, 1st Quarter Moon, Full Moon, 3rd Quarter Moon
C. 1st Quarter Moon, New Moon, 3rd Quarter Moon, Full Moon
D. Full Moon, 1st Quarter, New Moon, 3rd Quarter

A

B. New Moon, 1st Quarter Moon, Full Moon, 3rd Quarter Moon

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5
Q

What is the most direct cause of Earth’s four seasons? (Choose the most accurate explanation of those provided.)
A. The changing luminosity of the Sun (more luminous in summer, less luminous in winter).
B. The changing North-South position of the Sun in the sky throughout the year.
C. The changing position of the Moon with respect to the Sun and Earth.
D. The changing Earth-Sun distance during the year (Earth is closer to Sun in summer, farther away in winter).

A

B. The changing North-South position of the Sun in the sky throughout the year.

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6
Q
If the sun takes 365 days to circle completely around the ecliptic, what is its approximate angular speed in the Eastward direction with respect to the background stars? (You can do this without a calculator.)
A. 24 deg/day
B. 0.0027 deg/day    
C. 2 deg/day
D. 1 deg/day
E. 56 deg/day
F. 365 deg/day
A

D. 1 deg/day

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7
Q
One sidereal day, the time it takes the stars to return to the same relative position night after night, is closest to which of the following? (assume you're on Earth)
A. 12 months
B. 1 year    
C. 24 hours
D. 23 hours, 56 minutes, 4 seconds
E. 23.5 days
F. 23 hours
A

D. 23 hours, 56 minutes, 4 seconds

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8
Q

A solar eclipse occurs: (choose the most correct answer)
A. whenever the Sun is between the moon and Earth.
B. whenever there is a NEW moon.
C. whenever there is a FULL moon AND the moon is on the ecliptic.
D. whenever there is a NEW moon AND the moon is on the ecliptic.
E. Solar eclipses are never visible on Earth.
F. whenever there is a FULL moon.

A

D. whenever there is a NEW moon AND the moon is on the ecliptic.

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9
Q
You go outside one night ("Night A") and see the moon high in the sky, almost directly overhead. Very close to the moon you see Saturn; both are close to a bright star. The next night ("Night B") you observe Saturn again and notice it has moved WESTWARD with respect to the bright star. Approximately what time did the moon rise on the first night ("Night A")? Assume you were observing both nights from High Point, NC.
A. Midnight
B. Sunset (~6pm)    
C. Sunrise (~6am)
D. Noon
A

B. Sunset (~6pm)

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10
Q

If the circumference of the earth is 24000 miles (approximately true) and the earth rotates once every 24 hours (also approximately true), what is the speed of a person standing at the equator due to the rotation of Earth? Answer in miles per hour (mph). (NOTE: Type your answer WITHOUT commas and WITHOUT the UNITS) (OTHER NOTE: You should be able to do this in your head, without a calculator!)

A

1000 mph

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11
Q

Which of the following are TRUE statements concerning lunar phases and eclipses. Select all that apply. (NOTE: Pretend you are observing from HPU)
A. A third quarter moon occurs approximately 1 week AFTER a new moon.
B. Lunar eclipses only occur near the full moon phase.
C. A full moon can rise at midnight.
D. The new moon rises and sets when the sun does.
E. The moon is NEVER visible in the sky during the daytime.

A

B. Lunar eclipses only occur near the full moon phase.

D. The new moon rises and sets when the sun does.

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12
Q

Where in the sky would you find a 1st quarter moon at midnight? (Assume you’re observing from High Point University)
A. Overhead, high in the sky (near the meridian).
B. West, near the horizon (setting)
C. East, near the horizon (rising)
D. The 1st quarter moon is not visible then.

A

B. West, near the horizon (setting)

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13
Q
The image below shows the location of the Sun and several constellations at noon on a particular day. (On this day, the Sun is in Gemini.) Which constellation will the Sun mostly likely be in, a few hours later on that same day? 
A. Aries
B. Gemini    
C. Taurus
D. Leo
E. Cancer
A

B. Gemini

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14
Q
The image below shows the location of the Sun and several constellations at noon on a particular day. (On this day, the Sun is in Gemini.) Which constellation will the Sun mostly likely be in one month later? ("East" is to the left in this image, "West" is to the right.)
A. Gemini
B. Taurus    
C. Cancer
D. Aries
A

C. Cancer

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15
Q
In the heliocentric model (shown below), if you were observing the stars and planets FROM THE SURFACE OF MARS, which of the following planets could NEVER be found opposite the Sun in the Martian sky? (Check all that apply)
A. Mercury
B. Saturn
C. Earth
D. Jupiter
A

A. Mercury

C. Earth

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16
Q

Which of the following observations are consistent with the Geocentric Model (shown below)? (Check all that apply; assume all observations are made from Earth)
A. Mercury and Venus can never be found opposite the Sun in the sky
B. Stars do not show parallax
C. Jupiter, Saturn, and Mars sometimes show retrograde motion
D. The Moon shows retrograde motion once a month

A

A. Mercury and Venus can never be found opposite the Sun in the sky
B. Stars do not show parallax
C. Jupiter, Saturn, and Mars sometimes show retrograde motion

17
Q
If you're observing from High Point, NC, which month will the full moon be highest in the sky at midnight? (Hint: the moon generally follows the ecliptic; think of the tilt of the ecliptic and where the moon is with respect to the Sun
A. June
B. September    
C. December
D. March
A

C. December

18
Q
If you're observing from High Point, NC, which month during the year will the Sun be the highest in the sky at NOON?
A. September
B. December    
C. June
D. March
A

C. June

19
Q

If one took a picture of the Sun at NOON approximately once per week for 1 year (same location, same time of day, same orientation each picture), a stack of all these images would look like the image below. In addition to telling you the Sun’s North-South position changes throughout the year (which gives rise to the seasons), what else does this pattern tell you?
A. The sun never sets at this location on the earth
B. The moon will take ~27 days to circle the ecliptic
C. The sun’s speed around the ecliptic varies throughout the year

A

C. The sun’s speed around the ecliptic varies throughout the year

20
Q

TRUE or FALSE: Because the moon orbits the Earth in a circular orbit with a constant speed, the moon is NOT accelerating. (Hint: be careful here)

A

False

21
Q
You have just discovered a new planet (named "Planet-2018") in our own Solar System. Assume it has a circular orbit around the Sun. If you determine the orbital separation distance between the Sun and Planet-2018 to be 4 AU, what should you measure for its orbital period?(Hint: use the form of Kepler's Third Law where the units are AU and years)
A. 4 years
B. 8 years    
C. 16 years
D. 0.5 years
E. 64 years
A

B. 8 years

22
Q

According to Newton’s gravitational force law, if you increase the separation between two orbiting bodies (say the Earth-Moon system), what happens to the gravitational force of attraction between those objects?
A. The force increases
B. The force stays the same
C. The force decreases

A

C. The force decreases

23
Q
In the distant future, the earth will rotate more slowly and the moon will be farther away. Suppose a future citizen of Earth measures the distance to the moon to be 3 times farther away than it is now. Approximately how long will its orbital period be compared to its period now? (Choose the BEST answer from the choices below; first decide whether the period will be longer or shorter)
A. 9 times longer
B. 9 times shorter    
C. no change
D. 3 times shorter
E. 5 times longer
F. 27 times longer
A

E. 5 times longer

24
Q
The image below illustrates the observations made by Eratosthenes in order to estimate the size of the Earth. If he measures an angle of $\theta=6$ degrees for the shadow cast by a pole in Alexandria when a pole in Syene casts no shadow at all, and if he measures a distance of $s=200$ stadia between Alexandria and Syene, what would he calculate for the circumference of Earth in stadia? (Choose the closest answer below; you can work this without a calculator.) 
A. 36 stadia
B. 36,000 stadia    
C. 1,200 stadia
D. 120,000 stadia
E. 12,000 stadia
F. 360 stadia
A

E. 12,000 stadia

25
Q
Where in the sky would you look to see a full moon at sunset?
A. East, close to the horizon (rising)
B. West, close to the horizon (setting)
C. It is not visible at that time
D. Almost overhead, high in the sky
A

A. East, close to the horizon (rising)

Why: Full moon always found opposite the sun in the sky (Sun in West on horizon at sunset)

26
Q
One week after a total solar eclipse, you o stargazing at midnight. Where in the sky should you see the moon?
A. Rising in the East
B. Setting in the West
C. It is not visible
D.  Almost overhead, high in the sky
A

B. Setting in the West
Why: Moon will be in first quarter phase (first quarter moon falls one week later than new moon), solar eclipse happens only during
new moon, At midnight, the new moon would be below your feet, next to sun (not up). A first quarter moon would be setting on the Western horizon

27
Q

Which of the phases below most closely matches what you would see for the object, from Earth:

Earth Object Sun

A. Full
B. New
C. First/Third Quarter

A

B. New

28
Q

If a planet orbits the Sun at a distance of 5 AU, approximately how long is its orbital period?

A. 4 years
B. 11 years
C. 25 years
D. 125 years

A
B. 11 Years
Why:
p squared = a cubed
p squared = 5 cubed
p squared = 125
square root of 125 =~11
29
Q

If the moon orbited Earth twice as far away as it is now, how would its period change?

A. doesn’t change
B. longer by a factor of ~3
C. shorter by a factor of ~2
D. longer by a factor of ~8

A
B. Longer by a factor of ~3
Why:
p squared = a cubed
p squared = 2 cubed
p squared = 8
square root of 8 =~3