Can someone please help me on an equilibrium problem?

  • #1
i have my physics exam tomorrow and i need help understanding this problem because i got this wrong on a previous test

Homework Statement


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?

Homework Equations


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


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
 
Last edited:

Answers and Replies

  • #2
584
0


Use the principle of deficiencies.
 
  • #4
584
0
[tex]\sum(F)=0[/tex]
 
  • #5
[tex]\sum(F)=0[/tex]
i probably sound really stupid saying this but.. is that calculus? because if it is i am currently only in algebra II
 
  • #6
584
0
i probably sound really stupid saying this but.. is that calculus? because if it is i am currently only in algebra II
No that's not calculus that sign (sigma) stands for the sum of all forces.
 
  • #7
No that's not calculus that sign (sigma) stands for the sum of all forces.
okay thank you!
i really appreciate it
 
  • #8
584
0
okay thank you!
i really appreciate it
Did you learn how to use the principle of inertia?
 

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