Your answer is correct.
A camera is suspended by two wires over a football field to get shots of the action from above. At one point, the camera is closer to the left side of the field. The tension in the wire on the left is 1500 N and the tension in the right side of the wire is 800 N. The angle between the two wires is 130 degrees. Determine the approximate magnitude and direction of the resultant force.
I ended up getting 1160.7 N upwards. The answer in my text says 1371.7 N upwards.
I got my answer like this:
1500^2 + 800^2 - 2(1500)(800)cos50
Is mine right?