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MathGroup Archive 2007

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Re: What's wrong?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75334] Re: What's wrong?
  • From: siewsk at bp.com
  • Date: Wed, 25 Apr 2007 05:41:28 -0400 (EDT)
  • References: <f0kbuc$r25$1@smc.vnet.net>

On the wikipedia page for Cross Product, it says

Magnitude[ A cross B ] = Magnitude[A] * Magnitude[B] * Sin[theta]

In spherical coordinates, the vector  {0,1,0} has the magnitude of
ZERO.

Thus   Magnitude[ A cross {0,1,0} ] = Magnitude[A] * ZERO * Sin[theta]
= ZERO

So when the resultant vector has a magnitude of ZERO, it's spherical
coordinates is {0,0,0}

Steven Siew

On Apr 24, 5:34 pm, "gogoan... at yahoo.com.hk" <gogoan... at yahoo.com.hk>
wrote:
> In[1]:=
> <<Calculus`VectorAnalysis`
>
> In[2]:=
> CrossProduct[{1,0,0},{0,1,0},Spherical]
>
> Out[2]=
> {0,0,0}
>
> Isn't the result supposed to be {0,0,1}, even in spherical
> coordinates?
>
> lion




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