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Math Help - Find U dot V

  1. #1
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    Find U dot V

    Find U ● V, angle between them is 55, |u| = 6, |v|=4. I was wondering how to set this up, thanks.
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  2. #2
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    Re: Find U dot V

    One fairly standard definition of the dot product of u and v is |u||v| cos(\theta) where \theta is the angle between the vectors. Have you not seen that before?
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  3. #3
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    Re: Find U dot V

    I have not.
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  4. #4
    Senior Member sakonpure6's Avatar
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    Re: Find U dot V

    The dot vector http://www.mathsisfun.com/algebra/ve...t-product.html
    This is the geometric dot vector because the definition has cos theta in it: a \cdot b = |b| |a| cos \theta
    This is the algebraic dot vector, Let vector a=(x,y,z) b = (m,n,o) : a \cdot b = (x,y,z) (m,n,o) \\= x*m + y*n + z*o
    Also you should note that the dot vector of any two vectors produces a SCALAR.

    So provided the information and equation, can you solve the problem you have?
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  5. #5
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    Re: Find U dot V

    Quote Originally Posted by sakonpure6 View Post
    The dot vector Dot Product
    This is the geometric dot vector because the definition has cos theta in it: a \cdot b = |b| |a| cos \theta
    This is the algebraic dot vector, Let vector a=(x,y,z) b = (m,n,o) : a \cdot b = (x,y,z) (m,n,o) \\= x*m + y*n + z*o
    Also you should note that the dot vector of any two vectors produces a SCALAR.

    So provided the information and equation, can you solve the problem you have?
    It is NOT the dot vector. It is either called the DOT PRODUCT or the SCALAR PRODUCT. The result is a scalar, not a vector, and the vector product is different. Please use the correct terminology to avoid confusing the OP.
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  6. #6
    Senior Member sakonpure6's Avatar
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    Re: Find U dot V

    Thanks for noticing that, I meant "dot product".
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