i have my physics exam tomorrow and i need help understanding this problem because i got this wrong on a previous test(adsbygoogle = window.adsbygoogle || []).push({});

1. The problem statement, all variables and given/known data

Two concurrent forces are acting on a box with a mass of 50.0 kg. One force is 555 N acting at an angle of 140 degrees; the other force is 785 N at an angle of 200 degrees. What third force would have to be added to the situation to produce a state of equilibrium?

2. Relevant equations

f= ma i guess... i didnt use it though

3. The attempt at a solution

555sin(40)-785sin(20) >> V

-555cos(40)-785cos(20) >> H

then i square rooted V^2 + H^2

then i tan^-1(V/H)

and i got some negative funky number

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# Homework Help: Can someone please help me on an equilibrium problem?

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