21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 2, Problem 7QP
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Which is correct answer.
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2. During a sunrise, the Sun appears to "rise up" from the horizon. Why does this happen?
A. Earth is spinning on its axis.
B. The Sun is circling around Earth
C. The Sun is moving closer to Earth.
D. Earth is revolving around the Sun.
Explanation:
Because of the precession of the Earth’s axis,
a.
there are four seasons, spring, summer, fall, and winter.
b.
the Earth receives more solar radiation in the summer than in the winter.
c.
Polaris will not be the North Star in about 12,000 years.
d.
the lengths of the Earth’s days and nights vary throughout the year.
The location on the celestial sphere which represents the path of the Sun followed in the sky is known as the
a.equator.
b.meridian.
c.ecliptic.
d.latitude.
e.longitude.
If I observe a specific phase of the Moon on January 1, 2022, when should I expect to observe the exact same phase?
a.On January 28, 2022 at 8pm.
b.On January 27, 2022 at 8pm.
c.On January 29, 2022 at noon
d.On January 30, 2022 at noon.
e.The day after.
A physical blackbody is
a.an object that does not absorb any radiation.
b.a body the emits only non-visible light.
c.an idealization of an object that absorbs all radiation falling upon it.
d.an object with a huge gravitational force.
e.any hot object whose overall colour is black.
Chapter 2 Solutions
21st Century Astronomy
Ch. 2.1 - Prob. 2.1ACYUCh. 2.1 - Prob. 2.1BCYUCh. 2.2 - Prob. 2.2CYUCh. 2.3 - Prob. 2.3CYUCh. 2.4 - Prob. 2.4CYUCh. 2.5 - Prob. 2.5CYUCh. 2 - Prob. 1QPCh. 2 - Prob. 2QPCh. 2 - Prob. 3QPCh. 2 - Prob. 4QP
Ch. 2 - Prob. 5QPCh. 2 - Prob. 6QPCh. 2 - Prob. 7QPCh. 2 - Prob. 8QPCh. 2 - Prob. 9QPCh. 2 - Prob. 10QPCh. 2 - Prob. 11QPCh. 2 - Prob. 12QPCh. 2 - Prob. 13QPCh. 2 - Prob. 14QPCh. 2 - Prob. 15QPCh. 2 - Prob. 16QPCh. 2 - Prob. 17QPCh. 2 - Prob. 18QPCh. 2 - Prob. 19QPCh. 2 - Prob. 20QPCh. 2 - Prob. 21QPCh. 2 - Prob. 22QPCh. 2 - Prob. 23QPCh. 2 - Prob. 24QPCh. 2 - Prob. 25QPCh. 2 - Prob. 26QPCh. 2 - Prob. 27QPCh. 2 - Prob. 28QPCh. 2 - Prob. 29QPCh. 2 - Prob. 30QPCh. 2 - Prob. 31QPCh. 2 - Prob. 33QPCh. 2 - Prob. 34QPCh. 2 - Prob. 35QPCh. 2 - Prob. 36QPCh. 2 - Prob. 37QPCh. 2 - Prob. 38QPCh. 2 - Prob. 39QPCh. 2 - Prob. 40QPCh. 2 - Prob. 41QPCh. 2 - Prob. 42QPCh. 2 - Prob. 43QPCh. 2 - Prob. 44QPCh. 2 - Prob. 45QP
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- Why is a sidereal day shorter than a solar day? O A. precession of Earth's axis B. the non-circular orbit of Earth around the Sun C. the tilt of Earth's axis D. the combined effect of the rotation of Earth and its orbit about the Sun E. Earth year being a non-integer number of Earth daysarrow_forwardIf tonight the phase is waning gibbous when the Moon rises, what will be the phase one week from now? A. third quarter B. first quarter C. waning crescent D. new E. fullarrow_forwardWhich of the following groups of moon phases are above the horizon at 8 pm? A. third quarter, waning crescent, and waxing gibbous B. new Moon, third quarter, and waning gibbous O C. waxing gibbous, full Moon, waning gibbous D. waxing crescent, first quarter, waxing gibbous O E. None. The Moon is only visible above the horizon during the night time.arrow_forward
- 1. Calculate the zenith angle at solar noon at a latitude of 40° N on January 19.arrow_forward14. Cause of the Seasons. Suppose a friend is trying to claim that it is summer when Earth is closest to the Sun and winter when Earth is farthest away. Refute this claim in at least two different ways: (1) with an argument that invokes seasonal differences between the Northern and Southern Hemispheres and (2) with an argument based on the times of year at which Earth actually is closest to and farthest from the Sun. Write out your arguments clearly.arrow_forward15. If I notice that the Moon rises at noon on a particular day, what can I conclude about thephase of the Moon?A. third quarter moon B. new moon C. full moon D. first quarter moonarrow_forward
- 1. The big dipper is part of A. URSA major B. CANIS major C. AQUARIUS D. LIBRA 2. The appearance of this constellation in the East is the first sign of spring A. SCORPIO B. LEO C. PAGASUS D. VIRGO 3. What is the red star in the constellation orion? A. SIRIUS B. BETELGEUES C. RIGEL D. LEO In the United States when can you see the orion in the evening? A. Summer B. winter C. Spring D. All year rounds 5. What is the largest constellation? A. Andromeda В. Нydra C. Orion D. Ursa Minor 6. The very bright stars alpha Centauri and Beta Centauri point towards A. The big Dipper B. The southern cross C. The milky way D. Galaxy 7. Sirius the brightest star of all, is in A. Canis major B. Corona Borealis C. Scorpius D. All of the above 8. The zodiac Marks A. Star cluster that are visible all night B. A ring of the brightest star in the night sky C. The path the sun appears to take through the sky D. None of the above 9. How many official constellations are there? 4. A. 48 В. 8 С. 12 D. 21 10. The…arrow_forwardH3. A total lunar eclipse is observed on December 31. Predict the next lunar eclipse. A total lunar eclipse will occur when the full moon and the nominal orbit of the moon line up together (The solution of two equations). From the following data algebraic equation for the phase of the moon and nominal orbit of the moon can be formed. A new moon (0%) was observed on December 17 and the full moon (10%) was observed on December 31 along with the nominal orbit of the moon (0%). The brimming orbit of the moon (100%) was observed on November 29. When the two equations are equal a lunar eclipse will occur. How many days from December 31 will next lunar eclipse occur? Given the coming year is a leap year - on what dates will the next 4 total lunar eclipses occur? Show the algebraic solution, any information you use.arrow_forwardEach year, the radius of the moon’s orbit increases by about 3.8 cm. How does this change affect the length of a month?A. A month gets longer.B. A month gets shorter.C. The length of a month stays the same.arrow_forward
- You take the 10:30 pm bus home after studying at the library. While you wait at the bus stop, what phases of the Moon could you possibly see? A. waxing crescent through full Moon B. full Moon through waning crescent O C. new Moon through waxing gibbous D. waxing gibbous through third quarter O E. first quarter through waning gibbousarrow_forward4. Over the course of a night, suppose you are observing two stars that you label as Star A and Star B. The coordinates of Star A are RA = 9h 00m 0s, DEC = 0° 0' 0" and the coordinates of Star B are RA = 11h 20m 0s, DEC = 0° 0' 0". On that night, Star A passes through the zenith at 12:15 A.M. local time. At what time will Star B pass through the zenith? Explain your answer.arrow_forwardExplain the origin of the leap year. Why is it necessary?arrow_forward
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