The two vectors a and b have equal magnitudes of 13.0 m and their angles are θ1 = 30° and θ2 = 100°.(adsbygoogle = window.adsbygoogle || []).push({});

Find the components of their vector sum, r.

I know this is a very simple problem, but I can't get it! And it is frustrating me to no end.

I know the y component of the sum is 16.3. (I don't remember how I got this, but it's right.)

However, when I try to find the x components of each vector, I get 11.26 for a, and -2.26 for b. When these are added, you get 9.0. And the computer(our HW is graded online) is telling me that this is the wrong answer.

What am I doing wrong?!

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Vectors problem trouble

**Physics Forums | Science Articles, Homework Help, Discussion**