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Thread: [Resolved] Trigonometry and Vectors

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  1. Mar 16th, 2006, 03:21 AM #1
    yrwyddfa
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    Resolved [Resolved] Trigonometry and Vectors

    Having a dumb moment, so I need a little help. I have a 'vector' defined as U=-4.3, and V=-3.3

    From these two figures I need to derive an angle of about 45degs and a speed of about 11.

    I have no idea (although remember doing stuff like this ages ago) where to start. Actually that's not true . . .

    The hypo = -5.42 (by way of pythag) I can get the tan of the angle (o over a) but I can't recall how to derive the angle - and I certainly have no idea how to derive speed . . .

    I presume that the speed is the length of the vector?
    Last edited by yrwyddfa; Mar 16th, 2006 at 06:18 AM.
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