Posted by Wellness on Thursday, October 29, 2009 at 3:11pm.
(a) Given that A= 3i  j + 2k and
B=2i + 3j  k find A x B
(b) if A= i + j, B= 2i  3j + k and
C= 4j  3k
find (i) (AxB)x C
(ii) Ax(BxC)

Help on Vectors & Geometry  bobpursley, Thursday, October 29, 2009 at 6:19pm
I will do one. These are much easier to do as matrix multipication on your calc, I would learn to do that.
1)
AxB= (3ij+2k)x(2i+3jk)
= 3*3ixj3ixk2jxi+jxk+4kxi+6kxj
well, ixj=k
jxk=i
kxi=j (and the opposite order means )
AxB= 9k+3j+2k+i+4j6i
check that, and combine terms.
Answer This Question
Related Questions
 math  given that vectors(p+2q) and (5p4q) are orthogonal,if vectors p and q ...
 math  given that vectors(p+2q) and (5p4q) are orthogonal,if vectors p and q ...
 vectors and geometry  Given that a = 5i +2j  k and b = I  3j + k. Find (a + b...
 PreCalculus  Given vectors u=7i + 3j and v = 4i + 3j, find 5u4v in terms of ...
 Trig  I need help with my vectors unit. I'm really confused about how to set ...
 vectors  Given the vectors v=2i+5j and w=3i+4i, determine (do I just plug what...
 Vectors  Vectors "v" and "w" are given by v = 5i  2j and w = i + 3j. Find ...
 Math  Algebraic Vectors  Given the vectors: u = [3, 0] v = [1, 2] a) Express ...
 Physics  Given the displacement vectors A = (7.00  1.00 + 3.00 ) m and B = (6....
 Vectors/Calc  Note: u,v,w,a,b are all vectors Given that u= xa + 2yb v= 2ya + ...
More Related Questions