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Archive for January, 2012

ReAssessment Notes

January 31, 2012 Leave a comment

Just a few quick reminders:

  • If you want to submit a reassessment, you must submit something within 2 weeks of the original assessment.  After that, if you still don’t understand the material, you can re-reassess.
  • Peer review.  I said you need to have your screen cast reviewed by at least two other students.  I am not going to check this, but it is still a requirement.  I don’t want you sending me something that you haven’t had someone else go over also.  Trust me, this is good for you.
  • If you have technical difficulties with screen casts, ask me for help.  If you ask me for help one hour before the screen cast is due, I will talk really slowly.
  • VPython.  I still haven’t decided how to assess the vpython things.  They will be optional – in that your scores on vpython items will replace your other lowest scored standards.  For now, just pick some program to show a screen cast of – hopefully you will show a vpython program that can demonstrate your understanding.
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Collision Example

January 31, 2012 Leave a comment

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Approximation for constant gravitational field

January 31, 2012 Leave a comment

Here is a post you might like. It is an analysis of some gravitational wells.

http://blog-admin.wired.com/wiredscience/2010/01/xkcd-and-gravity-wells/

Yes, I know. We haven’t looked at potential energy yet. However, this does show how near the surface of the Earth the gravitational force is essentially constant. Sorry, I thought I had a post that did the same thing with forces, but I was wrong.

An example of the momentum principle

January 26, 2012 Leave a comment

This is very similar to the problems in the chapter 2 homework.

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Quick Intro to the Momentum Principle

January 26, 2012 Leave a comment

Maybe this is useful, maybe not.

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Equations for Chapter 2

January 26, 2012 Leave a comment

For Chapter 2, I would expect that you would know:

  • The definition of average velocity
  • The definition of momentum
  • The momentum principle

I will give you the following equations (along with any constants you might need):

\vec{p} = \frac{m\vec{v}}{\sqrt{1-\frac{v^2}{c^2}}}
\vec{F}_\text{spring} = -ks\hat{L}
\vec{F}_\text{grav} = m\vec{g}
\vec{g} = \text{} \text{ N/kg}

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Regarding VPython Standards

January 26, 2012 Leave a comment

Here is what I am thinking: VPython is super important (well, numerical calculations) for all fields.  However, since we don’t have computers in class I think someone could claim these standards are unfair.  With this in mind I will make the following rule regarding the VPython Standards:

  • It is highly recommended that you work on the VPython standards.
  • I will even give a couple of questions in class regarding VPython standards.
  • At the end of the semester, I will replace any of your lowest standards with VPython scores that are higher.  So, say you do terrible on standard 1.3 and you only scored a 2/5.  You did a VPython standard with a score of 4/5.  I would replace the 2 with a 4 at the end of the semester.

 

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