Saturday

December 20, 2014

December 20, 2014

Posted by **Kim K** on Thursday, October 9, 2008 at 8:42pm.

m, n and p are constants. If:

a + b = 9i + 6j

a.c = 10

b x c = 2k

Show that p = 6, and determine values for m and n.

i got the p=6

as for the rest...what i did so far

b x c = 2k

so (6i x nj) + 2j x mi

6nk + 2mk = 2k...cancel out k's and simplify by dividing through by 2

so

3n + 1m = 1

___

a.c = 10

so

3i.mi + 4j.nj = 10

3m + 4n = 10

i would say solve simulatneously...but

when i do that, the answer doesn't come out to

m = 2 and n = 1

instead, i get m=3.2 and n=1.4

- Phys... vectors -
**bobpursley**, Thursday, October 9, 2008 at 8:46pmOn the cross product.

ixj=k but jxi=-k. I think you missed the minus

The equation on the dot is correct.

- Phys... vectors -
**Kim K**, Thursday, October 9, 2008 at 8:51pmwow...lol...look at what one little mistake can do

THANKS!~ i got it now

**Answer this Question**

**Related Questions**

math - given that vectors(p+2q) and (5p-4q) are orthogonal,if vectors p and q ...

math - given that vectors(p+2q) and (5p-4q) are orthogonal,if vectors p and q ...

physics - Can you help me with this one also? I know how to do it with 3 vectors...

linear algebra - which of the following sets of vectors span R^3? a.){(1, -1, 2...

Calculus and vectors - Please, help I don't understand vectors T.T 1. In the ...

vectors - ok theres a graph. its like this. basically theres a ray coming from ...

math - two vectors are defined as a=2i+xj and b=i-4j. find value of x if a) the ...

math - two vectors are defined as a=2i+xj and b=i-4j. find value of x if a) the ...

Math - Algebraic Vectors - Given the vectors: u = [3, 0] v = [-1, 2] a) Express ...

PreCalculus - Given vectors u=7i + 3j and v = -4i + 3j, find 5u-4v in terms of ...