October 7th, 2009, 01:29 PM  #1 
Member Joined: Sep 2009 Posts: 51 Thanks: 0  Vectors
Suppose that vectors A, B and C are related by AB=C. a) Is it possible that AB=C? If so, draw the sort of situation when this is so. (A is the magnitude of A, B of B and C of C.) b) Is it possible that C=A+B? If so, then draw the sort of situation when this is so.  a) I used the Pythagorean triplet 3,4,5 for this situation. b) I'm not sure but I think the question basically asks whether C can equal A+B and at the same time can C equal the square root of the sum of the squares of A and B. I'm having trouble getting my head around this. 
October 7th, 2009, 02:59 PM  #2 
Member Joined: Sep 2009 Posts: 51 Thanks: 0  Re: Vectors
OK never mind, false alarm. For some reason I was thinking strictly in the form of triangles for my vector subtraction. I believe situation b) is possible if you have any two vectors of opposite direction.


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