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Physics Vector Question

  1. Sep 11, 2010 #1
    I am having trouble with this problem I have solved most of it it is just the last part I don't understand.

    Problem:
    Two vectors are given by

    a= ( 4.0 m)i - (3.0 m)j + (1.0 m) k



    and

    b= (-1.0 m)i + (1.0 m)j + (4.0 m)k


    In unit-vector notation, find (a) a + b, (b)a - b, and (c) a third vector c such that a - b + c = 0.

    the answers I got for letters a) and b)

    a) (3.0 m)i + (-2.0 m)j + (5.0 m) k

    b) (5.0 m)i + (-4.0 m) j + (-3.0 m) k

    c) ?

    I need help with letter c) please :)

    Thanks :)
     
  2. jcsd
  3. Sep 11, 2010 #2

    PhanthomJay

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    You already solved a - b correctly in part (b), so now you want to find a vector c to cancel that out.
     
  4. Sep 11, 2010 #3
    there is no vector c though?
     
  5. Sep 11, 2010 #4

    PhanthomJay

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    You are asked to find a vector c such that when it is added to the vector (a -b), you get 0.
     
  6. Sep 11, 2010 #5
    thank you I understand now! thanks for the help!
     
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