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Math Help - More Finding Vectors

  1. #1
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    More Finding Vectors

    1) Find two vectors of length 26 units and slope 5/12

    I'm pretty positive I got this wrong because my answer doesn't make sense so I won't even post it.

    2) Find a unit vector which if the terminal points (4,4) on x^2=4y is normal to the curve and pointed toward the positive y-axis

    I dunno how to do this...
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by aznsushiguy View Post
    1) Find two vectors of length 26 units and slope 5/12

    I'm pretty positive I got this wrong because my answer doesn't make sense so I won't even post it.
    first start with a vector that has terminal point (12,5) (do you see why?)

    find the unit vector of that vector

    multiply the unit vector by 26 to get the final answer

    2) Find a unit vector which if the terminal points (4,4) on x^2=4y is normal to the curve and pointed toward the positive y-axis

    I dunno how to do this...
    the "if" in the question makes it read weird. please review to make sure you have the right wording. anyway, it seems you want the vector perpendicular to the tangent vector that points to the y-axis
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  3. #3
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    Quote Originally Posted by Jhevon View Post
    first start with a vector that has terminal point (12,5) (do you see why?)

    find the unit vector of that vector

    multiply the unit vector by 26 to get the final answer
    I got 13 for the unit vector of (12,5)

    is the answer in terms of i + j? I did that and got 24i + 10j (is that a proper answer for this question?), but that seemed too simple to me because the answer just doubled the points (12,5).

    If by chance I am right, how do i find another vector that's the same?

    Quote Originally Posted by Jhevon View Post
    the "if" in the question makes it read weird. please review to make sure you have the right wording. anyway, it seems you want the vector perpendicular to the tangent vector that points to the y-axis
    ahhhh, do commas help? I skipped over those.

    2) Find a unit vector which, if the terminal points (4,4) on , is normal to the curve and pointed toward the positive y-axis

    Thanks
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by aznsushiguy View Post
    I got 13 for the unit vector of (12,5)
    you mean the length of the unit vector is 13

    is the answer in terms of i + j? I did that and got 24i + 10j (is that a proper answer for this question?), but that seemed too simple to me because the answer just doubled the points (12,5).
    yes, 24i + 10j is right

    If by chance I am right, how do i find another vector that's the same?
    take the negative of the first

    ahhhh, do commas help? I skipped over those.

    2) Find a unit vector which, if the terminal points (4,4) on , is normal to the curve and pointed toward the positive y-axis

    Thanks
    the problem is still kind of weird. you mean the terminal of the unit vector is on the curve at (4,4), pointing to the y-axis. you can't really describe that vector in i,j notation then
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