anonymous
  • anonymous
can some body help me with this vector problem? http://tinyurl.com/3wne3vx
Mathematics
schrodinger
  • schrodinger
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amistre64
  • amistre64
ae is an addition of p+q; h is a fraction magnitude of AC
amistre64
  • amistre64
and its scalar so AE = hp + hq AE = h(p+q)
amistre64
  • amistre64
is that other symbol a gradient symbol?

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amistre64
  • amistre64
DE:EF is a ration of g:1...
amistre64
  • amistre64
DE = g(EF)
amistre64
  • amistre64
or just plain g = DE/EF
amistre64
  • amistre64
AF = k(p)
amistre64
  • amistre64
is g a magnitude?
amistre64
  • amistre64
that seems to be the best I can pull out if it....
amistre64
  • amistre64
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anonymous
  • anonymous
i need help for part b
amistre64
  • amistre64
p*q = cos(t) |p||q|
amistre64
  • amistre64
(1/2)(2)(3) = 3 p*q = 3
anonymous
  • anonymous
how do you find k?
amistre64
  • amistre64
if you determined that g=1/k; then k = 1/g
amistre64
  • amistre64
if DF is perp to AC then: DF * AF = 0
amistre64
  • amistre64
DF*AC = 0
amistre64
  • amistre64
given the magnitudes expressed as they are, that is helpful
anonymous
  • anonymous
so (-p+kq)*(p+q) = 0
amistre64
  • amistre64
|DF| = * --------- |kp||q| and theres a place to put the cos(pi/3); just gotta recall it :)
amistre64
  • amistre64
its the law of cosines... |DF|^2 = |k3|^2 + |2|^2 -2|k3||2| cos(pi/3)
amistre64
  • amistre64
|DF|^2 = 9k^2 + 4 -12k(1/2) |DF|^2 = 9k^2 + 4 -6k
amistre64
  • amistre64
|DF|^2 = 9k^2 -6k + 4 dont know how much this is gonna be useful :)
amistre64
  • amistre64
angle b=120degrees or 2pi/3
amistre64
  • amistre64
- =
amistre64
  • amistre64
k = p*q ----- 3
amistre64
  • amistre64
p*q = 3 |3k||2| (1/2) = kp*q 3k = k(p*q) since DAB = pi/3, then q = <1,sqrt(3)>
amistre64
  • amistre64
p = <0,3>
amistre64
  • amistre64
right?
anonymous
  • anonymous
yeah
anonymous
  • anonymous
i get it now
amistre64
  • amistre64
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amistre64
  • amistre64
im starting to get it :)
anonymous
  • anonymous
do you have any tips on how to solve vector because im going to have a very important test in 2 weeks?
amistre64
  • amistre64
nothing that you probably dont already know, ive been reading up on them for the past week to get a feel for them.

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