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Determine the magnitude of the resultant force

  • Thread starter Precursor
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  • #1
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Homework Statement
If [tex]F_{B} = 5kN[/tex] and the resultant force acts along the positive u axis, determine the magnitude of the resultant force.

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The attempt at a solution

[tex]F_{Rx} = F_{R}cos 30[/tex]

[tex]F_{Ry} = F_{R}sin 30[/tex]

[tex]F_{Rx} = 3 + 5cos\theta[/tex]

[tex]F_{Ry} = 5sin\theta[/tex]

Therefore, [tex]\frac{3 + 5cos\theta}{5sin\theta} = \sqrt{3}[/tex]

Is this correct so far? I don't know how to isolate [tex]\theta[/tex]
 
Last edited:

Answers and Replies

  • #2
diazona
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What variable is the problem asking you to find?
 
  • #3
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What variable is the problem asking you to find?
It is asking for the resultant force which acts along the u axis.
 
  • #4
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It is asking for the resultant force which acts along the u axis.
That is right so you don't have to find [tex] \theta [/tex]
 
  • #5
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That is right so you don't have to find [tex] \theta [/tex]
Then how would I go about finding the resultant force? Using a combination of the equations I posted in my attempt?
 
  • #6
diazona
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Yep. I asked which variable the question was asking for for a reason; make sure you know which variable you need to find the value of and don't let it disappear when you combine the equations.
 
  • #7
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Yep. I asked which variable the question was asking for for a reason; make sure you know which variable you need to find the value of and don't let it disappear when you combine the equations.
But I still don't see how I can solve for the resultant force without first solving for theta. Am I missing something?
 

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