physics

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Vector A has a magnitude of 8.00 units and makes an angle of 45.0° with the positive x-axis. Vector B also has a magnitude of 8.00 units and is directed along the negative x-axis. Using graphical methods, find (a) the vector sum A + B and (b) the vector difference A – B.

Could someone please show me how this problem is done, maybe even with a graph somehow? Thanks

  • physics -

    Vectors are directed. When the problem says " is directed along the negative x axis" IT DOES NOT MEAN that. It means the vector is in the same direction as the negative x axis.

    Draw from the origin the A vector. At its tip,put a little arrow head. Now, in the DIRECTION of the negative x axis, from the tip of A, draw B.

    A+B will then be the vector from the origin to the tip of B.

    Now for A-B. From the tip of A, draw B but in the direction of +x axis. From the origin to the tip of that reversed B is A-B.

  • physics -

    See
    http://i263.photobucket.com/albums/ii157/mathmate/VECTORS.jpg

  • physics -

    vecter a has a magnitude of 8.00 uints and makes an angle of 45.0with the positive x-axis?

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