Two equal forces act on an object at 80 degree to on another. the resultant force has a magnitude of 100 N. What are the forces.
This is what I did
not sure what to do after
Sorry, I got one more question
$\displaystyle |\overrightarrow{u}|=110, |\overrightarrow{v}|=75$ and the angle between$\displaystyle \overrightarrow{u}$ and $\displaystyle \overrightarrow{v}$ (when placed tail to tail) is $\displaystyle 100^\circ$. Find $\displaystyle |\overrightarrow{u} + 3\overrightarrow{v}|$
1. If you have a new question start a new thread. Otherwise you risk that nobody will notice your need for help.
2. Use the Cosine rule:
$\displaystyle l = \sqrt{110^2+(3 \cdot 75)^2-2\cdot 110 \cdot 3 \cdot 75 \cdot \cos(100^\circ)}$
I've got $\displaystyle l \approx 261.6$