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Math Help - physics, displacement problem

  1. #1
    Senior Member
    Joined
    Jan 2007
    Posts
    477

    physics, displacement problem

    The x component of a displacement vector is -2.7 cm, the displacement has a magnitude of 6.7 cm, and the y component is negative.

    a. Need to find the angle of the vector, relative to the x-axis?
    So have to give as an angle between -180 and +180.

    b. also, need to find the y-component of the displacement?
    in cm:

    Any help with this would be appreciated please.
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  2. #2
    Newbie
    Joined
    Oct 2007
    Posts
    9
    Well since you know the x component and the magnitude you can set up an equation to find the angle like

     \bigtriangleup x=magnitude * cos(\theta)<br />

    then use the knowledge that the y component is negative to give the angle theta the correct sign. Next solve for y as you did for x.

     \bigtriangleup y=magnitude *sin(\theta)<br />

    And your done.
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