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Find the Magnitude and the Direction (Unit Vetors)

  1. Feb 5, 2009 #1

    I missed the first lecture of my physics class and need help answering these simple questions. They have to do with adding and subtraction and multiplying unit vectiors. What do they mean by direction, this is in degrees?

    Also, Im not sure if this is possible but a diagram would be very helpful.

    1. The problem statement, all variables and given/known data

    Suppose B = -7i + 2j and G=6i - 4j. Find the magnitude and direction of:

    a.) B + G
    b.) B - G
    c.) 3B

    Thank you
  2. jcsd
  3. Feb 5, 2009 #2


    Staff: Mentor

    Do you have a textbook for your class? It will show you how to add and subtract vectors, calculate their magnitudes, and find unit vectors.
  4. Feb 5, 2009 #3


    User Avatar
    Science Advisor

    Can you determine at least what B+ G, B- G, and 3B are? The point of "component notation" is that you can deal with the corresponding components separately:
    (ai+ bj)+ (ci+ dj)= (a+c)i+ (b+d)j, 3(ai+ bj)= 3ai+ 3bj.
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