User talk:KimberlyWynne: Difference between revisions

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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.
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^{-15} m \;</math>) <ref>Which is larger, the proton or the neutron? http://www.physlink.com/education/AskExperts/ae570.cfm</ref>
# Neutron = <math>3 quarks \;</math> (or <math>r \approx 1 fm = 1.113284057367 \times 10^{-15} m \;</math>) <ref>Which is larger, the proton or the neutron? http://www.physlink.com/education/AskExperts/ae570.cfm</ref> <ref>What are the sizes of protons neutrons and electrons? http://wiki.answers.com/Q/What_are_the_sizes_of_protons_neutrons_and_electrons</ref> <ref>On the Radius of the Neutron, Proton, Electron and the Atomic Nucleus http://www.wbabin.net/physics/yue.pdf</ref>
# Atom = empirical atomic radius <math>r \approx 62 - 520 pm = 62 - 520 \times 10^{-12} m \;</math> <ref>Information about Atomic Radii: http://www.webelements.com/</ref> <ref>J.C. Slater, ''J. Chem. Phys.'' 1964, '''41''', 3199.</ref>
# Atom = empirical atomic radius <math>r \approx 62 - 520 pm = 62 - 520 \times 10^{-12} m \;</math> <ref>Information about Atomic Radii: http://www.webelements.com/</ref> <ref>J.C. Slater, ''J. Chem. Phys.'' 1964, '''41''', 3199.</ref>
# Biological Cell = <math>10 \mu m \;</math> <ref>Campbell, Neil A.; Brad Williamson; Robin J. Heyden (2006). [http://www.phschool.com/el_marketing.html Biology: Exploring Life]. Boston, Massachusetts: Pearson Prentice Hall. ISBN 0-13-250882-6</ref>
# Biological Cell = <math>10 \mu m \;</math> <ref>The Biological Cell on Wikipedia http://en.wikipedia.org/wiki/Cell_(biology)</ref> <ref>Campbell, Neil A.; Brad Williamson; Robin J. Heyden (2006). [http://www.phschool.com/el_marketing.html Biology: Exploring Life]. Boston, Massachusetts: Pearson Prentice Hall. ISBN 0-13-250882-6</ref>
# Person
# Person
# Earth
# Earth

Revision as of 01:46, 9 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] [3] [4]
  2. Atom = empirical atomic radius [5] [6]
  3. Biological Cell = [7] [8]
  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
  3. ↑ What are the sizes of protons neutrons and electrons? http://wiki.answers.com/Q/What_are_the_sizes_of_protons_neutrons_and_electrons
  4. ↑ On the Radius of the Neutron, Proton, Electron and the Atomic Nucleus http://www.wbabin.net/physics/yue.pdf
  5. ↑ Information about Atomic Radii: http://www.webelements.com/
  6. ↑ J.C. Slater, J. Chem. Phys. 1964, 41, 3199.
  7. ↑ The Biological Cell on Wikipedia http://en.wikipedia.org/wiki/Cell_(biology)
  8. ↑ Campbell, Neil A.; Brad Williamson; Robin J. Heyden (2006). Biology: Exploring Life. Boston, Massachusetts: Pearson Prentice Hall. ISBN 0-13-250882-6

References

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