Posted by Jat on Tuesday, February 21, 2012 at 1:00pm.
When Studying Vectors, How Would I Go About Answering This Question?
In Each of the following Cases, find the magnitude and direction of the resultant vectors of the two given vectors:
a) a displacement of magnitude 26km on a bearing of 175 degrees and a displacement of magnitude 18km on a bearing 294 degrees
b) Forces of 355 N on a bearing of 320 degrees and 270 N on a bearing of 025 degrees
help would be MUCH appreciated, if you could also explain how you answer it ?
also if you feel like drawing a diagram on paint or something if you could link it?
THANKS :D

Mechanics AS (Vectors)  Steve, Tuesday, February 21, 2012 at 1:21pm
in order to add vectors, it's necessary to convert to (x,y) from (r,θ)
For problem (a), we want to add
(26,175°) and (18,294°)
Now, bearings use 0° as North, measured clockwise, so we have to use
x = r*sinθ
y = r*cosθ
(26,175°) > (2.266,25.901)
(18,294°) > (16.444,7.321)
add 'em up to get
(14.178,18.580)
convert back to (r,θ) to get distance and bearing.
now go and do (b) the same way
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