Mathematics 78 Online
OpenStudy (anonymous):

Attached below is a vector question. I'm having trouble grasping the concepts involved, but hopefully i have it figured out. Can someone that knows this stuff view the questions and perhaps verify my answers and/or steer me in the correct direction?

OpenStudy (anonymous):

OpenStudy (anonymous):

do you need help find component of the vector ? or unit vector?

OpenStudy (anonymous):

i'll tell you where i'm at...u tell me if i'm on the right track?

OpenStudy (amistre64):

a unit vector is akin to a "unit" circle, a "unit" anything = 1

OpenStudy (anonymous):

OpenStudy (anonymous):

sounds good

OpenStudy (amistre64):

"unscale the vectors by dividing out the "length"; since length/length = 1

OpenStudy (anonymous):

okay...i'll just work on the A vector....i got a length of 75 and an angle of 27 degrees....so if try to find Ax i use 75cos(27) to get 66.8?

OpenStudy (anonymous):

i'm not following amistre

OpenStudy (anonymous):

75cos(27) is right for Ax

OpenStudy (anonymous):

before this afternoon i've never seen a vecotr in my life

OpenStudy (anonymous):

then for Ay i should do the samething except 75sin(27) for 34.0?

OpenStudy (amistre64):

x = 27 cos(t) ; y = 27sin(t)\[\] A = <27 cos(t),27sin(t)\>[\] unitA = <cos(t),sin(t)\>[\]right?

OpenStudy (anonymous):

yep

OpenStudy (amistre64):

ugh, i got lost in the nukbers; same concept tho i believe

OpenStudy (anonymous):

okay...can you open the answer form attachment and tell me if that's all i put in the A vector slot?

OpenStudy (anonymous):

yes, but they might want exact answer?

OpenStudy (anonymous):

OpenStudy (anonymous):

75 cos(27) i, 75 sin(27)j

OpenStudy (anonymous):

or is that my theta = artcan (ay/ax)?

OpenStudy (amistre64):

let me try that again:\[\] x = 75 cos(27) ; y = 75sin(27)\[\] A = <75 cos(27),75 sin(27)>\[\] unitA = <cos(27),sin(27)>\[\]

OpenStudy (anonymous):

sadly this pellet is probably easy and i'm overcomplicating it huh?

OpenStudy (anonymous):

yes, you got this

OpenStudy (amistre64):

it is; you want to fit the vector into the unit circle

OpenStudy (anonymous):

so the x ^ that rooftop on top of the x is what part?

OpenStudy (amistre64):

|dw:1314314242837:dw|