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PHY 105 Final
Terms in this set (63)
When does a star reach it's highest altitude?
When it crosses the meridian.
If Draco is in the North, which part of the sky will the constellation Ursa Major appear at 10 pm tonight?
What is the name of the constellation that will appear near the Western Horizon?
An observer located in Allendale, MI sees a star rise directly in the East (90 degree azimuth). What direction would the observer have to face to view the same star six hours later?
A star is observed to cross the meridian at exactly midnight. At what time will the star cross the meridian again the next day?
A little earlier than midnight
An observer sees a star moving near the Eastern Horizon as shown below. What is the location of the observer?
The Southern Hemisphere
An observer sees a star pass directly through Zenith and later set directly in the West. Where on Earth is the observer located?
Where is the Sun located at local solar noon on the day of the Summer solstice for an observer in Michigan?
On what days of the year does the sun rise directly in the East and set directly in the West?
Vernal Equinox and Autumnal Equinox
An observer located in the continental United States sees the sun at noon on the first day of September at an altitude of 40 degrees. How will the position of the sun be different at noon tow weeks later?
It will be closer to the horizon.
Which of the following statements is true about the location of the Sun at sunrise on December 21st?
The Sun will rise South of East.
Which of the following statements is correct for the day of the year when a flagpole in the continental US casts its shadow at noon?
It is the day of the Winter Solstice.
Imagine that the Earth's orbit about the sun were changed to a perfect circle so that the distance to the sun never changed, but the length of a year remained the same. How would this affect the seasons?
We would continue to experience seasons in essentially the same way we do now.
The maximum declination of the sun (the farthest North the Sun moves above the celestial equator) is determined by...
The tilt of the Earth's rotation axis relative to Earth's orbit around the Sun.
What is the Right Ascension and Declination of the Sun at the time of the Spring Equinox?
If the direction of the Earth's orbit around the Sun was somehow reversed, but the rotation of Earth remained unchanged, a sidereal day would be...
longer than a solar day.
A model for which the stars, planets, and other objects orbit the stationary Sun is called...
Which of Galieleo Galilei's observations suppor a heliocentric model of the solar system?
The Phases of Venus
A planet is moving prograde (normal) motion will, over the course of one night, appear to....
move East to West in the Sky.
The explanation for the retrograde motion of planets in the current heliocentric model is that...
The planets closer to the Sun move faster and overtake those farther from the Sun.
According to Kepler's Second Law of Planetary Motion, a planet with an orbit like that of Earth would...
Experience very little change in orbital speed over the course of the year.
What would happen to the orbital period of a planet orbiting the Sun if the mass of the planet were doubled but it stayed at the same orbital distance? It would take...
The same amount of time to orbit the Sun.
Imagine a new planet in our solar system located 3 AU from the Sun. Which of the following best approximates the orbital period of this planet?
Which of the following bests describes what would happen if Mercury and Jupiter were to switch places in their orbits around the Sun?
Jupiter, the larger planet, would have a shorter orbital period than before.
Consider a satellite that is three times as far away as Earth's center as the surface of Earth. The gravitational force exerted on the satellite by Earth is...
1/9 the force it would experience at Earth's surface.
Imagine two asteroids (A and B) with asteroid A having a mass 5 times larger that the mass of Asteroid B. How does the gravitational force exerted by A on B compare to the gravitational force exerted by B on A?
The force exerted by A on B is the same force as B on A.
Which of the asteroids experiences a larger acceleration resulting from the gravitational force between the asteroids?
Asteroid B experiences a larger acceleration than asteroid B.
In 1971, Commander David Scott of the Apollo 15 mission did an experiment on the surface of the moon (which has no air) dropping a hammer and a feather from the same height at the same time. Which statement correctly describes the outcome of the experiment?
While the moon exerts different forces on the hammer and the feather, both reached the ground at the same time because of Newton's 2nd Law and the Law of Gravity.
Because of that, which of the statements is true.
Both the feather and the hammer experience the same acceleration.
Which of the following hypothetical changes to the Earth-Moon system would increase the gravitational force by Earth on the Moon by the largest amount.
The moon is moved to half its current distance from Earth.
In Which direction does the Moon orbit Earth when observed from a point high above Earth's North Pole?
Which of the following best describes why the Moon goes through phases?
We see only part of the illuminated half of the moon depending on it's position relative to Earth and Sun.
How much of the Moon's surface is being illuminated when the Moon is in it's New phase?
Which of the following consecutive sequences of Moon phases are possible within once cycle of phases?
new, waxing,crescent, first quarter, gibbous.
If the moon is waning gibbous phase tonight, approximately how long will it be until the Moon is waning crescent?
You observe a full Moon rising in the East. What phase will the Moon be in when it sets later that day/night.
You observe the Moon rising at 6pm. this means the Moon is...
In the East and Full.
If the moon is highest in the sky this morning at 6 am, what phase will the moon be one week from now?
What phase will the Moon be in during a Solar Eclipse?
No particular phase.
Which statement best describes the relative positions of the Sun Earth and Moon during a lunar eclipse?
The Earth is located between the Sun and the Moon.
Mars performs retrograde motion when it is near...
Consider a scale model of the inner solar system in which the Earth's orbit has a radius of 10cm. About how large would the diameter of the Sun be in this scale model?
For the scale model in the previous problem, about how large would the diameter of the Moon's orbit around Earth be?
A red giant star has a diameter about 10 times the diameter of the Sun. Approximately how many Earth's could fit across this red giant star?
The diameter of the Sun is about 100 times the diameter of Jupiter. Approximately how many Jupiters would fit inside the diameter of the Moon's orbit around Earth?
What are the defining characteristics of the terrestrial planets?
Small orbits, rocky, few moons, no rings, small size.
The standard model of the solar system formation offers what explanation for the different compositions of the terrestrial and Jovian planets?
The terrestrial planets were formed near the Sun where, because of high temperatures, only heavier elements were able to condense.
Astronomers have discovered giant, Jupiter-like gas planets orbiting their companion stars at closer than 0.7 AU. Why do astronomers believe that these giant gas planets did not originally form at these locations?
The temperature in the early solar nebula was too high at these distances.
Which of the following planets formed at temperatures above the boiling point?
Venus, Earth, and Mars
Which of the innermost planet that initially formed at a distance from the Sun where the temperature was below the freezing point of water?
Mars and Jupiter
On Earth the parallax angle measured for the star Procyon is 0.29 arcseconds. If you were to measure Procyon's parallax angle from Marts, what would the parallax angle be?
more than 0.29 arcseconds
Rank the following electromagnetic radiation from lowest to highest energy...(visible, infrared, ultraviolet, xray, radio)
Radio, infrared, visible, ultraviolet, x-ray.
Rank the following electromagnetic radiation from shortest to longest wavelength...(Blue, red, yellow, microwave, gamma-ray)
gamma-ray,blue, yellow, red, microwave.
Rigel is a much more luminous star than Sirius B, but both stars have the same temperature. Which star has the smaller surface area?
Imagine you are observing two stars. One star is hot and small and the other star is cooler and larger. Which of the stars is more luminous?
There is insufficient information to answer this question.
If the stars Betelgeuse and Rigel were to have the same luminosity, but the surface are of Betelgeuse was larger than that of Rigel, which star would have the greater temperature?
Suppose that you observe the Sun while in a space ship far above Earth's atmosphere. Which of the following spectra would you observe by analyzing the sunlight?
Dark line absorption spectrum
What happened to the light that is missing in an absorption spectrum?
It was absorbed by atoms in a low-density gas cloud.
If you analyzed the light from a hot, low-density gas such as a flame, which type of spectrum would you see?
Bight line emission spectrum
Light can be thought of as being composed of tiny particles called...
Light is emitted by atoms when electrons...
move from high energy levels to low energy levels.
If an electron in an atom moves from an energy level of 10 to an energy level of 5...
a light particle of energy 5 is emitted.
Imagine that light from a hot, dense object passes through a cool, diffuse could through a prism. If the temperature of the hot, dense object were increased slightly, which of the following changes would happen to the resulting spectrum?
The lines in the spectrum would not change.
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