Physics 1215 Forum

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Friday, April 4, 2008 at 23:29:37 by joshua barron 

Wow, no one has posted since February. We all posted questions and comments every week last semester...what happened?

Anyway, did anyone figure out the railgun problem (Ch. 20 #35)? I have answers that I checked against real values for 
railguns via wikipedia, but they seemed all too easy. I found it odd that I didn't have to do anything with the 
current loop (no KVL, KCL, etc.). I got:

(a) F = IlB = 7.8 x 10^5 N

(b) a = F/m = 7.8 x 10^6 m/s^2
    v = 7.9 x 10^3 m/s (using the kinematics equations)

Is this what everyone got? We've already turned this one in but it was bugging me.

Thursday, February 14, 2008 at 15:06:09 by Michael Strauss 

Grades are now posted.  I will update them about 4 times during the semester, usually
right after every exam and right before the final.

Wednesday, February 6, 2008 at 23:38:15 by Aaron Bugher 

When are grades going to start being posted?

Tuesday, January 22, 2008 at 11:28:45 by Josh Barron 

Anyone figure number 40 from the homework? I'm really not sure whether to set up the problem as F=ma, 
or use the CWE Theorem, or The First Law of thermodynamics, or what.

Wednesday, January 16, 2008 at 13:50:57 by Aaron Bugher 

Hi... I just wanted to be the first person to post..  : )

Thursday, January 3, 2008 at 15:52:28 by Michael Strauss 

This is a test to see if the discussion format works.  The script to run this web page
was written a long time ago and is not very sophisticated.  You must update the page
to see the latest comments, including the comment you just posted.  Also, please hit
the "Enter" key when you get to the end of the line, like you would on an old 
typewriter.  That is, hit "Enter" before you reach the right hand side of the box you
are typing in above.  Then hit the "Submit" button only once to submit your comment.  
It's not very sophisticated, but it does work.