Three Forces: Equilibrium

  • Thread starter BioBabe91
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  • #1
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Homework Statement


Forces of 5N, 7N, and 8N are applied to an object, calculate the angle between the lines of action of the 5N and 7N forces.


Homework Equations


Sin, cos, and tan relationships


The Attempt at a Solution


I know that you have to use components, but I don't see how to do this without knowing at least one angle.
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
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According the cosine rule
a^2 = b^2 + c^2 - 2bc*cosθ. In the problem a, b and c is given. Find θ.
 

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