3psilon
  • 3psilon
Two vectors A and B have magnitudes of 6m and make an angle of 60 degrees with each other. Find A DOT B.
Mathematics
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3psilon
  • 3psilon
Two vectors A and B have magnitudes of 6m and make an angle of 60 degrees with each other. Find A DOT B.
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
\[\cos \theta=\frac{ x \dot y }{ \left| x \right|\left| y \right|}\]
anonymous
  • anonymous
so then just plug in your info, and solve for x dot y, or a dot b in this case.
3psilon
  • 3psilon
How did you get the Cos theta = that stuff?

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anonymous
  • anonymous
its just a theorem or an equation which comes from the law of cosines
3psilon
  • 3psilon
So is it just 3?
anonymous
  • anonymous
well i took it when i first read it that A and B each had a magnitude of 6, but if they are 6 together, then yes it would be 3.
3psilon
  • 3psilon
Oh they each have 6 So it would be 18>?
3psilon
  • 3psilon
18

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