I need help with vectors

Question

anonymous · Answer

attachment

amistre64 · Answer

up in the sky, its a bird, its a plane, .... it only a direction with magnitude :)

amistre64 · Answer

perp and parallel are your tangent and normals

anonymous · Answer

ok

amistre64 · Answer

but v is only a single vector so its hard to derive that with what i was thinking

anonymous · Answer

F = F parallel + F perpindicular

amistre64 · Answer

|dw:1331748311890:dw|

what is F by chance?  they just name it

amistre64 · Answer

I see, F is defined in the following numberal things ..

amistre64 · Answer

the i and j parts are just your x and y component; i find it easier to read in <x,y> notation

amistre64 · Answer

v = <3,4> F1 = <4,1> F2 = <0.2,-0.5)

amistre64 · Answer

the of F component parallel/perp to v?

anonymous · Answer

ugghhh idk nething

amistre64 · Answer

it might help if I could survey the material that this chapter is covering becasue the question is making no good sense to me

anonymous · Answer

LOL

amistre64 · Answer

vi and Fi are most likely parallel components parts; same for vj to Fj

and vi is perp to Fj  is about all i can make from it ....

anonymous · Answer

just forget it

anonymous · Answer

whtvr

amistre64 · Answer

since Work = Force * distance; the dot product of F.v is the answer for c :)

anonymous · Answer

ok thanks

amistre64 · Answer

http://www.asu.edu/courses/kin335/documents/Work,%20Power,%20and%20Energy.pdf "for those of you who have had advanced math, the parallel component is computed by the dot product of the force and displacement vectors"

anonymous · Answer

ok thanks @amistre

bahrom7893 · Answer

amistre how do u know all this??

amistre64 · Answer

oh its quite simply, I never bother to retain it so each time I have to learn it anew lol