Physics
posted by Fabricus .
Consider four vectors ~F1, ~F2, ~F3, and ~F4, where their magnitudes are F1= 57 N, F2= 38 N, F3= 25 N, and F4= 67 N. Let θ1= 130◦, θ2=−130◦, θ3= 29◦, and θ4=−64◦, measured from the positive x axis
with the counterclockwise angular direction as positive. What is the magnitude of the resultant vector ~F, where ~F=~F1+~F2+~F3+~F4?
Answer in units of N.

x components of each
57 cos 130 = 36.6
38 cos 130= 24.4
25 cos 29=
67 cos 64=
sum of x components = sumx =
y components of each
57 sin 130=
38 sin 130=
25 sin 29=
67 sin 64=
sum of y components = sumy =
F^2 = sumx^2 + sumy^2