Phys... vectors

posted by .

Consider the following three vectors: a = 3i + 4j ; b = pi + 2j ; c = mi + nj , where
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


3n + 1m = 1


a.c = 10


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 -

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

    The equation on the dot is correct.

  • Phys... vectors - at what one little mistake can do

    THANKS!~ i got it now

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. linear algebra

    which of the following sets of vectors span R^3?
  2. vectors

    ok theres a graph. its like this. basically theres a ray coming from the origin going up and left diagonally at about a 30 degree angle. the question says "for the following vectors draw the component vectors along the x and y axis". …
  3. physics

    Can you help me with this one also? I know how to do it with 3 vectors but I can't seem to draw it with 4 vectors. The magnitudes of the four displacement vectors shown in the drawing are A=16.0 m, B=11.0 m, C=12.0 m, and D=26.0 m.
  4. Calculus and vectors

    Please, help I don't understand vectors T.T 1. In the prism, assume all dimensions have different lengths, state the following: a) state 3 equal vectors to DC⃗ b) state 4 opposite vectors to BC⃗ ------------------------------------- …
  5. math

    given that vectors(p+2q) and (5p-4q) are orthogonal,if vectors p and q are the unit vectors,find the product of vectors p and q?
  6. math

    given that vectors(p+2q) and (5p-4q) are orthogonal,if vectors p and q are the unit vectors,find the dot product of vectors p and q?
  7. Physics

    Find the scalar product of the vectors ai+bj and bi-aj . Where a and b are arbitrary constants. What's the angle between the two vectors?
  8. Calculus

    How would I find the equilibrant of three vectors?
  9. Physics

    Consider two vectors one of magnitude 3 and the other 4 unit, which of the following is not correct?
  10. Physics

    Please help me with this its very hard to visualize the problem. The analytical method of adding vectors expressed in terms of their components may be applied to vectors in three dimensions, for which graphical work is inconvenient. …

More Similar Questions