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Unit Vector Problem

  1. Oct 5, 2009 #1
    1. The problem statement, all variables and given/known data
    Vector A has a magnitude of 9m. find the angles and the vector A

    2. Relevant equations
    u-hat equals the vector u divided by its length
    cos alpha=Ax divided by A
    cos Beta=Ay divided by A
    cos gamma=Az divided by A

    3. The attempt at a solution
    i do not know where to begin because 9 is the only number given, help please
  2. jcsd
  3. Oct 5, 2009 #2


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    Hi dtrain121, welcome to PF. Is the magnitude all that is given? No diagram, no components? What angles are you supposed to find?
  4. Oct 5, 2009 #3
    yes that is all that is given. im stuck, i do not think you can break it into components, the angles in the x, y, and z axes.
  5. Oct 5, 2009 #4


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    If you don't have the axes, then you cannot do the problem without more information. A vector has magnitude and direction. If you are just given its magnitude, then you cannot describe its direction.
  6. Oct 5, 2009 #5
    it is in all three axes
  7. Oct 5, 2009 #6


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    I don't understand what you mean. What is in all three axes?
  8. Oct 5, 2009 #7


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    Staff: Mentor

    As kuruman says, there is not enough information to solve the problem. Can you scan the original question and post it here as an attachment? There must be a diagram that shows a vector arrow or something.
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