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