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Homework Help: Position and Velocity Vector

  1. Jan 1, 2009 #1
    A point M is located by the vector r(t), which depends on time, but the length of r(t) is constant. Show that the velocity v(t) of M is perpendicular to r(t).
     
  2. jcsd
  3. Jan 1, 2009 #2

    arildno

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    Well, what can you say about the quantity:
    [tex]\vec{r}\cdot\vec{r}[/tex]
     
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