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Equation that equates the magnitude of a vector

  1. Oct 14, 2004 #1
    I am in 11th grade, in AP Physics... its calculus based, and I have never had calculus so its confusing. At this time I cannot find the equation that equates the magnitude of a vector off of an ai+bj equation. Does anyone know?
     
  2. jcsd
  3. Oct 14, 2004 #2

    Pyrrhus

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    Draw a vector, and mark his components, what figure does it look to you??
     
  4. Oct 14, 2004 #3
    ... thats not what my question was. I need to know how to find the magnitude for a vector before my test today during fifth period...
     
  5. Oct 14, 2004 #4

    Pyrrhus

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    It makes a Triangle, but an specific type of triangle, the one you can apply pythagoras theorem.

    a is a component of the vector, and b is another component of the vector.
    Both of these are cathetes(sp?) and the vector's magnitude is the hypotenuse.
     
  6. Oct 14, 2004 #5
    Oh I understand what you were saying. So its just, as per the ai+bj, a^2+b^2=the vector side^2?

    And is it just me or does three dimensional vector graphing really blow? :)

    Thank you.
     
  7. Oct 14, 2004 #6

    Pyrrhus

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    It's the vector is tridimensional, it's the same for the magnitude, the sum of the squares of the components is equal to the vector's magnitude squared.
     
    Last edited: Oct 14, 2004
  8. Oct 14, 2004 #7
    Ahah! I wont fail my test! Thanks for the help.
     
  9. Dec 5, 2004 #8
    hey.. i hope to take AP physics B next year but i woudnt have done a calclus course by then... is the course manageable without basic knowledge of calculus?

    thanks
     
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