AST201H1 Midterm: Midterm review A

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amethystminnow26

3 Feb 2011

School

UTSG

Department

Astronomy & Astrophysics

Course

AST201H1

Professor

Stefan Mochnacki

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AST201H1 Full Course Notes

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Document Summary

Universe totality of all space, time, energy, and matter. because light takes time to travel to us, looking far away = looking. distance to nearest large galaxy is 2. 5 million ly, therefore we see it as it was 2. 5 million years ago. au (astronomical unit) distance btw sun and earth. (g)acceleration of gravity- all falling objects accelerate at same rate despite mass air resistance causes differences in acceleration. Force is the only way to change mo mentu m causing acceleration ( -/ + ) Net force=combined effect of all the individual forces put together. Angular momentum- rotational mo mentu m of a spinning/orbiting object. = m ass x velocity x radius www. notesolution. com. Mass is amount of matter (on moon body mass stays the same) Weight is the force that a scale measures, depends on mass and forces (gravity) acting on mass ( on moon you weight less because of weaker force of gravity)

Related Questions

Which of the following correctly lists our "cosmic address" fromsmall to large?

a.) Earth, solar system, Milky Way Galaxy, Local Group, LocalSupercluster, universe

b.) Earth, solar system, Local Group, Local Supercluster, Milky WayGalaxy, universe

c.) Earth, Milky Way Galaxy, solar system, Local Group, LocalSupercluster, universe

The great astronomer Edwin Hubble discovered that all distant galaxies are receding from our Milky Way Galaxy with velocities proportional to their distances. It appears to an observer on the Earth that we are at the center of an expanding universe. Figure 3.64 illustrates this for five galaxies lying along a straight line, with the Milky Way Galaxy at the center. Using the data from the figure, calculate the velocities: (a) relative to galaxy 2 and (b) relative to galaxy 5. The results mean that observers on all galaxies will see themselves at the center of the expanding universe, and they would likely be aware of relative velocities, concluding that it is not possible to locate the center of expansion with the given information.

Figure 3.64 Five galaxies on a straight line, showing their distances and velocities relative to the Milky Way (MW) Galaxy. The distances are in millions of light-years (Mly), where a light-year is the distance light travels in one year. The velocities are nearly proportional to the distances. The sizes of the galaxies are greatly exaggerated; an average galaxy is about 0.1 MlY across.

ceruleangiraffe295

Which, if any, of the following statements is/are true?

1)Our galaxy, The Milky Way, is a member of The Local Group, whichis one of several groups of galaxies located in the VirgoSupercluster.
2)Most astrophysicists believe that our Solar System formed from animmense cloud of gas and dust about 4-1/2 million years ago.
3)Planets are believed to have formed by a process known asaccretion.
4)Two key elements in the Condensation Theory of PlanetaryFormation are 5)Conservation of Angular Momentum and CondensationNuclei.
6)The name of the second largest object in the Universe is TheSouthern Wall.
7)In our Solar System, the four jovian planets, Jupiter, Saturn,Uranus, and Neptune, are separated from the four terrestrialplanets, Mercury, Venus, Earth, and Mars, by the Kuiper Belt.
8)Our star, The Sun, is located on the Orion Arm, about 26,000light-years from the center of the Andromeda Galaxy.
9)It takes a photon of light about 4-1/5 years to travel from ourSolar System to the second closest star to Earth, ProximaCentauri.
10)The full range of human knowledge about our Universe spans about40 or 41 orders of magnitude on a spatial scale and about 13.7billion years on a temporal scale.
11)It takes a photon of light about 5-1/2 hours to travel from theSun to the orbit of the former planet Pluto.

AST201H1 Midterm: Midterm review A

AST201H1 Full Course Notes

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