Lauren V.

asked • 09/21/16

please help! physics vector question pt 5


Find the magnitude of the resultant when you add these two vectors:
3.8 Newtons at 56 degrees North of East
6.9 Newtons at 43 degrees North of West

Make sure you do the following in your answer:
include correct units
make your answer correct within 0.2
make your answer positive (because magnitudes are always considered positive)
put your answer in a form like one of these:
#.# N
##.# N

Neal D.

If you were to draw the vectors on a coordinate system and label them,
I believe you would see that you are going to use the Law of Cosines to 
find your resultant vector:
 
c2 = a2 + b2 -2ab(cos C)
 
a, b, and c are lengths of sides, C is the angle 
 
If you need help, let me know.
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09/21/16

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