Attachment 19210

Ok, so I spent like 15min on this and I got no luck -_- some help on how to do this question, plz and ty

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- Oct 6th 2010, 07:37 PMhaddad287adding vectors
Attachment 19210

Ok, so I spent like 15min on this and I got no luck -_- some help on how to do this question, plz and ty - Oct 6th 2010, 08:26 PMpickslides
For each of the 3 vectors you are given r and $\displaystyle \theta$

First of all, convert them back to cartesian co-ordinates.

$\displaystyle x = r \cos \theta$

$\displaystyle y = r \sin \theta$ - Oct 6th 2010, 08:28 PMhaddad287
Here is what I did. (after taking another 15min lol)

I found out the x-coord's and y-coord's for each. Added them all up. Then I found the Rx and Ry, then I found the angle and magnitude.

My anwer for angle waws -8.6, and the magnitude was 20.1 - Oct 6th 2010, 08:48 PMUnknown008
You need to say the from where you are measuring the angle. If you measure it from the x direction, you'll need 180 - 8.6 = 171.4 and since it is anticlockwise, you say that it's -171.4 degrees from the x axis.

I got slightly different answers. (20.0 N for magnitude and 8.7 degrees in your answer. Maybe you rounded off your numbers?)

But I think it's okay.