Vector A has a magnitude of 3.0 m and direction 1o3 degrees relative to the positive x-axis. Vector B has magnitude 5.0m and direction 215 relative to the positive x-axis.

Question

For the resultant
I did Rx= 3 cos 103 + 5 cos 215

Ry=3 sin 103 + 5 sin 215

Then sqrt Rx^2 + Ry^2 and got 4.77

1) The resultant R has direction?

less than 90 degrees
between 90 and 180
between 180 and 270
between 280 and 360

I do not know how to figure this out. Thank you.

Answer 1

Wasn't Rx something like -4.7
and Ry something like zero, but small positive? (I don't remember).

anyway, if Rx is negative, and Ry is slight postive, then theta is almost 180 deg.

Recheck Rx and Ry

Answer 2

so would it be between 90 and 180 or 180 and 270?