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vector math
- Thread starter Farcus
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vectors are quantities with direction, this is what separates speed from velocity <-- vector.
ive done some vector math during my physics 1 days (hence a physics book would be helpful, the algebra-based one that is ). its more like adding together vectors like (velocity and acceleration), adding vectors from two opposite directions is like adding a positive and negative numbers. if u have to solve for vectors along the x-axis and y-axis, u have to find the diagonals (pythagorean theorem i think?)
p.s. i dont remember my score exactly, but i got a 60-70% on practice test (chemistry on barrons). i missed stupid ****. should i be worried much? i have a lot of time till october and i know what i did wrong (cliche
). but im confident about my organic skills. other sections are fine. bio, math, and verbal are my thing. and soon is reading
ive done some vector math during my physics 1 days (hence a physics book would be helpful, the algebra-based one that is ). its more like adding together vectors like (velocity and acceleration), adding vectors from two opposite directions is like adding a positive and negative numbers. if u have to solve for vectors along the x-axis and y-axis, u have to find the diagonals (pythagorean theorem i think?)
p.s. i dont remember my score exactly, but i got a 60-70% on practice test (chemistry on barrons). i missed stupid ****. should i be worried much? i have a lot of time till october and i know what i did wrong (cliche
). but im confident about my organic skills. other sections are fine. bio, math, and verbal are my thing. and soon is readingI saw one question probably. Manipulation of vectors. And that was about the hardest (and only) thing on vectors that I saw.
So you'll be given 2 vectors or so, with their XY coordinates and you have to compute some manipulations... like 2A - 3B where A and B are vectors.
Those probably are quite straightforward, any vector with a coefficient in front of it you just multiply the X and Y values by that coefficient, do that for both vectors and then subtract the X coordinates from each other and the same for the Y's to get your final vector.
More concrete example: vector A(3,-2) and B(4,6)
2A - 2B = ?
so 2(3, -2) - 2(4,6) = (6,-4) - (8,12)
= (6-8, -4-12) = (-2, -16)
So you'll be given 2 vectors or so, with their XY coordinates and you have to compute some manipulations... like 2A - 3B where A and B are vectors.
Those probably are quite straightforward, any vector with a coefficient in front of it you just multiply the X and Y values by that coefficient, do that for both vectors and then subtract the X coordinates from each other and the same for the Y's to get your final vector.
More concrete example: vector A(3,-2) and B(4,6)
2A - 2B = ?
so 2(3, -2) - 2(4,6) = (6,-4) - (8,12)
= (6-8, -4-12) = (-2, -16)
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Linear Algebra a.k.a matrix theory is way, way, way more complicated than putting a couple of vectors together. As others have mentioned here, vector problems will involve the elementary kinds of addition/subtraction, multiplication, and/or applying that on a Cartesian x-y grid.
where exactly did you find this out?
theres no way that can be possible since vector analysis is not part of first year calc... which is just single variable... and theres not supposed to be any physics on there.. thats not very comforting ! lol
theres no way that can be possible since vector analysis is not part of first year calc... which is just single variable... and theres not supposed to be any physics on there.. thats not very comforting ! lol
Um, maybe because it was on the June PCAT?
Like I posted, the hardest thing you'll see on vectors is just vector addition/subtraction. There won't be anything worse than that.
