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Mathematics 24 Online
OpenStudy (anonymous):

vectors again

ganeshie8 (ganeshie8):

find the unit vector in the given direction, multiply it wid the required magnitude

OpenStudy (anonymous):

\[\frac{ 1 }{ 10 } <0,3,3>\]

ganeshie8 (ganeshie8):

nopes

OpenStudy (anonymous):

oooops

ganeshie8 (ganeshie8):

we're supposed to find a vector wid magnitude: 10 , and in the direction of vector: <0,3,3>

OpenStudy (anonymous):

first find the unit vector in the given direction and then multipluy the unit vector by 10 unit vector along the vector <a,b,c> is given by (<a,b,c> ) /sqrt(a^2 +b^2 +c ^2)

ganeshie8 (ganeshie8):

to find that, we can simply find the unit vector in the given direction <0, 3, 3> <0, 3, 3> ---------- 3^2+3^2

OpenStudy (psymon):

Find the magnitude of your current vector then multiply it by the number necessary to make the value = to 10.

ganeshie8 (ganeshie8):

*sqrt missing <0, 3, 3> ---------- sqrt(3^2+3^2)

OpenStudy (psymon):

\[\sqrt{(0)^{2}+(3)^{2}+(3)^{2}}*x = 10\]

OpenStudy (anonymous):

1/3sqrt(2) <0,3,3>

ganeshie8 (ganeshie8):

yes thats the unit vector. which will have magnitude 1

ganeshie8 (ganeshie8):

to get magnitude 10, multiply the unit vector wid scalar 10

OpenStudy (anonymous):

alright so the unmbers would be \[<0,\frac{ 10 }{ \sqrt(2) }, 10/\sqrt(2)>\]

ganeshie8 (ganeshie8):

looks correct !

OpenStudy (anonymous):

yep thank you...but i didn't understand why did we multiplied the magnitude by the unit vector

ganeshie8 (ganeshie8):

|dw:1378182283419:dw|

ganeshie8 (ganeshie8):

when we multiply the unit vector by a scalar, its magnitude increases by that factor

ganeshie8 (ganeshie8):

its simple as that, you can make urself convinced by doing the reverse process :- take the magnitude, and see if u get 10 back... :)

OpenStudy (anonymous):

got it ty

ganeshie8 (ganeshie8):

np :)

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