Simple vector problems (but causing me a headache)

  • #1

Homework Statement


For the vectors vector A and vector B in the figure below, use a scale drawing to find the magnitude and direction of the following vector operations. (A = 12.4 m, and B = 18.6 m.)
(Measure angles counterclockwise from the +x axis) Visual link below

I was digging a little online and I found another guy with the same problem. He even has the same questions I am stuck on.
http://www.cramster.com/physics-answers-5-631433-cpi0.aspx

The only thing different are the numbers I have which are stated above. Someone replied with the answer but I have no idea how he got them.


Homework Equations



The only ones I have been given are A+ B = The square root of a^2 + b^2
I also have that Tan(theta) = (ay/ax)


The Attempt at a Solution



I got a correct (both the magnitude and angle). However on b I cannot get the angle correct. C and D I am on now. If any help could be provided that would be great. Moreso is how you set up the equations =) I care more on that than the actual answer.

Homework Statement





Homework Equations





The Attempt at a Solution

 
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Answers and Replies

  • #2
179
0
Just draw the vectors accurately, length and angles, then measure the length and angle of the resultant.
 
  • #3
tiny-tim
Science Advisor
Homework Helper
25,832
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Hi Wishingwell! :smile:
For the vectors vector A and vector B in the figure below, use a scale drawing to find the magnitude and direction of the following vector operations. (A = 12.4 m, and B = 18.6 m.)

Homework Equations



The only ones I have been given are A+ B = The square root of a^2 + b^2
I also have that Tan(theta) = (ay/ax)

Moreso is how you set up the equations =)
Nooo … the question asks you to "use a scale drawing", not equations. :redface:

Draw a different https://www.physicsforums.com/library.php?do=view_item&itemid=99" for each part of the question, and just measure the third side. :smile:
 
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