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3psilon

  • 2 years ago

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

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  1. zonazoo
    • 2 years ago
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    \[\cos \theta=\frac{ x \dot y }{ \left| x \right|\left| y \right|}\]

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

  3. 3psilon
    • 2 years ago
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    How did you get the Cos theta = that stuff?

  4. zonazoo
    • 2 years ago
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    its just a theorem or an equation which comes from the law of cosines

  5. 3psilon
    • 2 years ago
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    So is it just 3?

  6. zonazoo
    • 2 years ago
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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.

  7. 3psilon
    • 2 years ago
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    Oh they each have 6 So it would be 18>?

  8. 3psilon
    • 2 years ago
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    18

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