Question

Anybody explain me, please

Answer 1

whats 2 plus 2

Answer 2

iam not done yet

Answer 3

\(\vec a\) =(-3,2,sqr3), find the unit vector that has the same direction as the given vector. I have (\[\frac{ -3 }{4 },\frac{ 1 }{ 2 },\frac{ \sqrt{3} }{4 }\]

Answer 4

dang ur smart

Answer 5

or wat

Answer 6

but according to the definition, sum of components of unit vector must be =1, I don't get it even mine is the same with the answer in book, please explain me what is wrong

Answer 7

Sum of the components SQUARED will equal 1.

Answer 8

@pepsa I am really need explanation from people who know about the field. please, don't have fun with my problem

Answer 9

You can't just add the components together - you need to square each one first if you're looking for the magnitude of the vector.

Answer 10

Square each of these and add them together\[\frac{ -3 }{4 },\frac{ 1 }{ 2 },\frac{ \sqrt{3} }{4 }\]

Answer 11

yes, i got it if do as you guide. so, it means i have to square them first?

Answer 12

thanks a lot, I got it now. since the length of the unit vector means I must do as you guide.

Answer 13

eg.
\[\left( \frac{ 1 }{\sqrt 2 } \right) ^2+ \left( \frac{ 1 }{\sqrt 2 } \right) ^2 = 1\]
If you just add 1/sqrt 2 +1/sqrt2, that won't equal 1.

Answer 14

yes, pythagorean theorem

Answer 15

Yep, that's how the length of a vector is found. ~same thing applies in 3D.