Question

Excuse me, please
3 vectors (they are not 0), |a|=5 |b|=3
the angle between a and b is 60
to balance , |c|=?

Answer 1

@ParthKohli can you help?

Answer 2

No, I am not well-versed in vectors :-(

Answer 3

Try putting a coordinate system on it, with a or b as one of the axes. Let's say b is the negative x-axis.
Then you can write a as the sum of its x- and y-components. I will make a drawing to explain...

Answer 4

thanks @ParthKohli , cuz there was nobody viewing, and I'm your fan, so I tried to ask you. that's alright, thanks for replying

Answer 5

thanks , @ZeHanz , I'll wait for your illustration.

Answer 6

Here it is: (try to get the lengths of a_x and a_y, the x and y components of a.

Answer 7

Once you have these values, you can add up all the x-components (there are 2).
There is also only one y-component (that of a).

To get c, you'll have to compensate in the opposite direction, so take the opposite values of the x- and y-components.

Hope this is clear enough ;)

Answer 8

cool how did you draw that? tks a lot,
in your way that I'll get c=5.5, is it?
but the answer is 7, am I misunderstanding or?
sorry for being confused ,still
your pic is very clear

Answer 9

oh sorry, wrong considering , give me a moment

Answer 10

I used Geogebra. Look it up at geogebra.org (it's free).

Answer 11

ok , my bad ,i got 7

Answer 12

thank you very much, i was stupidly stuck,
and thanks for telling me the app, i think it will be useful

Answer 13

Here's another drawing.
The sum of the x-components is -5 + -2.5 = -7.5.
The only y-component is 2.5√3. (there is a 30-60-90-triangle involved).

So to compensate, c should go 5.5 to the right and 2.5√3 down:
(lenght is indeed 7!)

Answer 14

yeah i got 7 when i told you i got it,
thank you very much
sorry for having a wrong considering at first,
i can't thank you enough for your patience and enthusiasm of answering me.
i can imagine what's going on when you gave me first picture.
thaks again

Answer 15

You're welcome!