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Thread: physics, displacement problem

  1. Oct 7th 2007, 02:21 PM #1
    rcmango
    rcmango is offline
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    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. Oct 7th 2007, 03:21 PM #2
    saywhat
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    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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