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3psilon Group Title

Two vectors A and B have magnitudes of 6m and make an angle of 60 degrees with each other. Find A DOT B.

  • one year ago
  • one year ago

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  1. zonazoo Group Title
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    \[\cos \theta=\frac{ x \dot y }{ \left| x \right|\left| y \right|}\]

    • one year ago
  2. zonazoo Group Title
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    so then just plug in your info, and solve for x dot y, or a dot b in this case.

    • one year ago
  3. 3psilon Group Title
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    How did you get the Cos theta = that stuff?

    • one year ago
  4. zonazoo Group Title
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    its just a theorem or an equation which comes from the law of cosines

    • one year ago
  5. 3psilon Group Title
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    So is it just 3?

    • one year ago
  6. zonazoo Group Title
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    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.

    • one year ago
  7. 3psilon Group Title
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    Oh they each have 6 So it would be 18>?

    • one year ago
  8. 3psilon Group Title
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    18

    • one year ago
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