Finding magnitude and direction of vectors

  • Thread starter Maddy315
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  • #1
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1. Vectors A and B both have a magnitude of 3.0 meters. Find the magnitude and direction of:
a) A+B
b) B-A
c) A-2B


2. additional info...
the problem comes with a picture of a the vectors. It shows the x and y axis. Vector B is going directly along the positive y axis. vector A is pointint 30 degrees up fromt he positive x axis.

I'm not sure if I'm looking too much into this problem and if it's super simple but for some reason I just can't get it.
Am I supposed to just rearrange the vectors?
For instance: B-A would be the vertical B vector attached to the A vector going the opposit way. and thenn...what? Not really sure what this problem wants me to do because it doesnt match up to what my teacher explained.
Help fast please!!
 

Answers and Replies

  • #2
49
2
When we add/subtract two vectors we put the tail of the second vector to the first vector and then we draw the resultant vector from the tail of the first vector to the second or last vector (if there are many) - which you already got. The problems actually want you to find for the direction and magnitude of the resultant vector. Next step would be to do component wise operation.

Try to look at this site http://hyperphysics.phy-astr.gsu.edu/hbase/vect.html.
 

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