## anonymous 4 years ago The displacement vectors A and B, when added together, give the resultant vector R, so that R = A + B. Use the data in the drawing and the fact that phi = 34° to find the magnitude R of the resultant vector and the angle θ that it makes with the +x axis. R = m θ = °

1. anonymous

WHERE IS THE DRAWING???

2. anonymous

in the physics section ill post it here

3. anonymous

|dw:1327256275315:dw|

4. anonymous

is R = $\sqrt{(A _{x}+B _{x}}) ^{2}+ (A _{y}+B _{y)}^{2}$

5. anonymous

use the Law of Cosines

6. anonymous

so 4cos34 would be R?

7. anonymous

I'm using cos(56) as my middle angle, something like A^2 + B^2 - 2ABcos(56) = R to find the length of R

8. anonymous

the angle 56 is complementary to 34, sandwiched between A and B with R as the opposite side of the triangle.