User talk:KimberlyWynne: Difference between revisions

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(Astrophysics Homework)
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****** myself
****** myself
*[[User:MatthewHoza|MatthewHoza]]
*[[User:MatthewHoza|MatthewHoza]]
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{| class="wikitable" align="right" border="1" cellpadding="5" cellspacing="0"
|+align="bottom" style="color:#AAAAAA;"|''Homeworks 1''
|<center><big>'''Homeworks 1'''</big></center>
[[Image:Example.jpg|thumb|center]]
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{| align="center" border="0" cellpadding="5" cellspacing="0" width="240"
! colspan="2" style="background:#ccffff;"| About this Assignment
|- valign="top"
| '''Topics'''
|
|- valign="top"
| '''Chapters'''
| 1 - 3
|- valign="top"
| '''Lectures'''
| 1 - 5
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'''Homeworks 1''' is the attempted solution to our second task<ref>Our first task was to register our PRS, visit the course web-page on Blackboard, look at the textbook, and write an equation for our [[Exercise PhysicsWiki|wiki]]</ref> in the course [[AST4210_5211: Introduction to Astrophysics - Fall 2009|Introduction to Astrophysics]]. This assignment is due on ''Wednesday 09/09/09'' and was assigned on 09/01/09.
==Problem 1==
List in order of increasing size and give the approximate size of the following objects: An atom,
a biological cell, a cluster of galaxies, the Earth, a galaxy, the Local Group of galaxies, a neutron, a neutron star, a person, the Solar System, our sun. Note: you may have to look in other books besides your textbook to get all this information.
# Neutron = <math>3 quarks \; </math> (or <math>r \approx 1 fm = 10^{-25} m \;</math> <ref>Which is larger, the proton or the neutron? http://www.physlink.com/education/AskExperts/ae570.cfm</ref>)
# Atom = <math>r \approx 62 - 520 pm = 62 - 520 \times 10^{-12} m\;</math>
# Biological Cell
# Person
# Earth
# Sun
# Neutron Star
# Solar System
# Galaxy
# Local Group of Galaxies
# Cluster of Galaxies
==Problem 2==
The nearest star outside the solar system is about 4 light years away.
# How far away is the star in kilometers?
# Suppose you travel to the nearest star in a rocket ship moving at 100 km per hour (100 km/hr is
about 62 mi/hr, a typical automobile speed on a Florida highway). How many years will it take
you to get to the star?
# Suppose you travel to the star at 10 km per second (the speed of a rocket in orbit around the Earth). How many years will it take you to get to the star?
==Problem 3==
Use the size of the Astronomical Unit in kilometers and the length of the year in seconds to calculate how fast the Earth moves in its orbit in kilometers/second.
==Problem 4==
Describe the essential differences between the Ptolemaic, Copernican, and Keplerian descriptions
of planetary motion.
==Problem 5==
Use Newton’s laws to show that the orbits of planets are ellipses.
==Notes==
<references/>
==References==
* B.W. Carroll & D. A. Ostlie (2007). ''An Introduction to Modern Astrophysics''. Addison Wesley. ISBN 0-8053-0402-9

Revision as of 23:19, 8 September 2009

      • Use this page to discuss whether or not (or how much) Kim Wynne is actually awesome.



Homeworks 1
Homeworks 1
Example.jpg
About this Assignment
Topics
Chapters 1 - 3
Lectures 1 - 5

Homeworks 1 is the attempted solution to our second task[1] in the course Introduction to Astrophysics. This assignment is due on Wednesday 09/09/09 and was assigned on 09/01/09.

Problem 1

List in order of increasing size and give the approximate size of the following objects: An atom, a biological cell, a cluster of galaxies, the Earth, a galaxy, the Local Group of galaxies, a neutron, a neutron star, a person, the Solar System, our sun. Note: you may have to look in other books besides your textbook to get all this information.

  1. Neutron = (or [2])
  2. Atom =
  3. Biological Cell
  4. Person
  5. Earth
  6. Sun
  7. Neutron Star
  8. Solar System
  9. Galaxy
  10. Local Group of Galaxies
  11. Cluster of Galaxies

Problem 2

The nearest star outside the solar system is about 4 light years away.

  1. How far away is the star in kilometers?
  2. Suppose you travel to the nearest star in a rocket ship moving at 100 km per hour (100 km/hr is

about 62 mi/hr, a typical automobile speed on a Florida highway). How many years will it take you to get to the star?

  1. Suppose you travel to the star at 10 km per second (the speed of a rocket in orbit around the Earth). How many years will it take you to get to the star?

Problem 3

Use the size of the Astronomical Unit in kilometers and the length of the year in seconds to calculate how fast the Earth moves in its orbit in kilometers/second.

Problem 4

Describe the essential differences between the Ptolemaic, Copernican, and Keplerian descriptions of planetary motion.

Problem 5

Use Newton’s laws to show that the orbits of planets are ellipses.

Notes

  1. ↑ Our first task was to register our PRS, visit the course web-page on Blackboard, look at the textbook, and write an equation for our wiki
  2. ↑ Which is larger, the proton or the neutron? http://www.physlink.com/education/AskExperts/ae570.cfm

References

  • B.W. Carroll & D. A. Ostlie (2007). An Introduction to Modern Astrophysics. Addison Wesley. ISBN 0-8053-0402-9
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