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Vectors, and some weried stuff that I dont get

  1. Sep 4, 2009 #1
    http://img30.imageshack.us/img30/1265/34711100.png [Broken]

    What is Vector D?? I only see Vector A and B, not the invisible one? Well you can define a new coridnate system X prime and Y prime and not worry about the degrees. But the other stuff is all greek to me. Book doesnt help :(, so any help is appreciated
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Sep 4, 2009 #2


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    Since this is homework, in the future it should be posted in the homework help section.

    It looks to me like D is the vector constructed as per the rule given on the left hand side, namely 4.7 (A+B).

    Keep in mind that while it may seem like a good idea to use a tilted coordinate axis defined by A and B, the question asks for the components of the resultant vector D in terms of x and y, the original coordinate axes. So you will have to deal with the angle eventually.
  4. Sep 4, 2009 #3


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    You are given a "recipe" for computing D. Simply do the specified operations. The result is D.
  5. Sep 5, 2009 #4
    4.7A + B, without the parentheses.
  6. Sep 5, 2009 #5


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    Science Advisor

    Right. Order of operations gets me every time.
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