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anonymous

  • 5 years ago

Find the vector <v>, knowing that its modulus is 5, and it is orthogonal to x axis. and <v>.<w>=6 and <w>=i+2j

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  1. anonymous
    • 5 years ago
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    being orthogonal to the x axis means it is parallel to the y axis so it is a scalar multiple of the unit vector in that direction, <j>. so it is of the form k<j> and can be written 0i+kj so dotting it with <w>, you get 0(1) + 2(k) = 6 according to what the problem says Therefore, 2k=6 so k=3 so the vector <v>=3j

  2. anonymous
    • 5 years ago
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    Does that help?

  3. anonymous
    • 5 years ago
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    yes this helped me a lot. thanks.

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