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July 31, 2014

July 31, 2014

Posted by **Jat** on Tuesday, February 21, 2012 at 1:00pm.

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 1:21pmin 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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