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An electrodynamic problem for amateur physicists.

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Author Topic:   An electrodynamic problem for amateur physicists.
coffee_addict
Member (Idle past 496 days)
Posts: 3645
From: Indianapolis, IN
Joined: 03-29-2004

coffee_addict Posts Only
Message 1 of 7 (137118)
08-26-2004 3:38 PM

in another thread, Phatboy writes:
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I believe that humans are unable to achieve their maximum potential or destiny without Gods help.
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This gave me an idea. Besides bigotry, some christian fundies seem to dominate the realm of I-know-all-there-is-to-know.
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So, here is a very simple electrodynamic problem. See if amateur physicists can get this. Actually, the difficulty level of this problem is a tenth that of Eta's planetary bodies problem.
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Let vector A = 5i + 9j - 7k and vector B = 3i + 4j + 5k.
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Find a unit vector that is perpendicular to both A and B.
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The Laminator
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We are the bog. Resistance is voltage over current.
​
For goodness's sake, please vote Democrat this November!
Replies to this message:
 Message 2 by Darwin Storm, posted 08-26-2004 7:29 PM coffee_addict has replied
  
Darwin Storm
Inactive Member

Darwin Storm Posts Only
Message 2 of 7 (137198)
08-26-2004 7:29 PM 		Reply to: Message 1 by coffee_addict
08-26-2004 3:38 PM

Its just the cross product divided by the magnitude, if I remember correctly
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something like" (7142)^-1/2(73i-42j-7k)
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I am a bit sloppy with my math sometimes, so not sure if I got the numbers right.
This message is a reply to:
 Message 1 by coffee_addict, posted 08-26-2004 3:38 PM coffee_addict has replied
Replies to this message:
 Message 3 by coffee_addict, posted 08-26-2004 7:31 PM Darwin Storm has replied
  
coffee_addict
Member (Idle past 496 days)
Posts: 3645
From: Indianapolis, IN
Joined: 03-29-2004

coffee_addict Posts Only
Message 3 of 7 (137199)
08-26-2004 7:31 PM 		Reply to: Message 2 by Darwin Storm
08-26-2004 7:29 PM

No.
​
The Laminator
​
We are the bog. Resistance is voltage over current.
​
For goodness's sake, please vote Democrat this November!
This message is a reply to:
 Message 2 by Darwin Storm, posted 08-26-2004 7:29 PM Darwin Storm has replied
Replies to this message:
 Message 4 by Darwin Storm, posted 08-27-2004 1:00 AM coffee_addict has replied
  
Darwin Storm
Inactive Member

Darwin Storm Posts Only
Message 4 of 7 (137275)
08-27-2004 1:00 AM 		Reply to: Message 3 by coffee_addict
08-26-2004 7:31 PM

my bad, the numbers were off a bit, cross product should look like this
: (7494)^(1/2) [73i -46j -7k]
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This message has been edited by Darwin Storm, 08-27-2004 12:33 AM
This message is a reply to:
 Message 3 by coffee_addict, posted 08-26-2004 7:31 PM coffee_addict has replied
Replies to this message:
 Message 5 by coffee_addict, posted 08-27-2004 1:38 AM Darwin Storm has replied
  
coffee_addict
Member (Idle past 496 days)
Posts: 3645
From: Indianapolis, IN
Joined: 03-29-2004

coffee_addict Posts Only
Message 5 of 7 (137278)
08-27-2004 1:38 AM 		Reply to: Message 4 by Darwin Storm
08-27-2004 1:00 AM

Actually, you only need to do a cross product the 2 vectors. No need to divide by the magnitude. So, the answer is C = 73i + 46j - 7k.
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Good job, by the way.
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This message has been edited by Darth Mal, 08-27-2004 12:39 AM
​
The Laminator
​
We are the bog. Resistance is voltage over current.
​
For goodness's sake, please vote Democrat this November!
This message is a reply to:
 Message 4 by Darwin Storm, posted 08-27-2004 1:00 AM Darwin Storm has replied
Replies to this message:
 Message 6 by Darwin Storm, posted 08-27-2004 3:12 AM coffee_addict has replied
  
Darwin Storm
Inactive Member

Darwin Storm Posts Only
Message 6 of 7 (137292)
08-27-2004 3:12 AM 		Reply to: Message 5 by coffee_addict
08-27-2004 1:38 AM

Let vector A = 5i + 9j - 7k and vector B = 3i + 4j + 5k.
​
Find a unit vector that is perpendicular to both A and B.
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sorry, habit from 3rd semester calc, you ask for a unit vector, you get a unit vector, hence the magnitude : )
​
This message has been edited by Darwin Storm, 08-27-2004 02:12 AM
This message is a reply to:
 Message 5 by coffee_addict, posted 08-27-2004 1:38 AM coffee_addict has replied
Replies to this message:
 Message 7 by coffee_addict, posted 08-27-2004 10:44 AM Darwin Storm has not replied
  
coffee_addict
Member (Idle past 496 days)
Posts: 3645
From: Indianapolis, IN
Joined: 03-29-2004

coffee_addict Posts Only
Message 7 of 7 (137337)
08-27-2004 10:44 AM 		Reply to: Message 6 by Darwin Storm
08-27-2004 3:12 AM

Ahhhhh, I see. I didn't even pay attention to that one word. Good job.
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This message has been edited by Darth Mal, 08-27-2004 09:47 AM
​
The Laminator
​
We are the bog. Resistance is voltage over current.
​
For goodness's sake, please vote Democrat this November!
This message is a reply to:
 Message 6 by Darwin Storm, posted 08-27-2004 3:12 AM Darwin Storm has not replied
  
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