Mark M. answered • 04/24/20
Mathematics Teacher  NCLB Highly Qualified
Use the Law of Cosines
v^{2} = 3^{2} + 7^{2}  2(3)(7)(cos 120°)
Can you solve for v and answer?
Two vectors act on a point a shown below. What is the resultant vector?
^ 
\ 7 
\ 
30° \ 
—————————

 3
V


(A) 5∠210°
(B) 8.889∠47.02°
(C) 6.083∠175.24°
(D) 7.616∠210°
(E) None of these.
I had gotten (E) but got it wrong. Can someone please help me understand this?!
Also, this was kind of hard to do, i couldn’t find a way to ask the question. So I “drew” what it looked like. So, I get if you have no idea what this is.
Mark M. answered • 04/24/20
Mathematics Teacher  NCLB Highly Qualified
Use the Law of Cosines
v^{2} = 3^{2} + 7^{2}  2(3)(7)(cos 120°)
Can you solve for v and answer?
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