# Engineering question about angle?

1. Aug 25, 2009

### fball558

Engineering question about angle??

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

Determine the angle (theta) for connecting member 1 to the plate soo that the resultant force of F1 and F2 is directed horizontally to the right. Also, what is the magnitude of the resultant force?
i drew a sketch diagram up in paint to help me but it did not. here is what i made.

2. Relevant equations
i know you will have to use some trig like cos and sin
also maybe law of cos

3. The attempt at a solution

i did the sketch also i tried braking down the both the F1 and the F2 into x and y components but got stuck on the x and y components for the F1 because i get for
x= 8 cos (90 - theta)
any help would be great.
thanks

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2. Aug 25, 2009

### Staff: Mentor

Re: Engineering question about angle??

So far, so good. Keep going. (Note that you can also express that x-component using sinθ.)

3. Aug 25, 2009

### fball558

Re: Engineering question about angle??

sin θ = Fr/8 where Fr is the resultant force. but that is 2 unknowns and i dont know what to do from there. i dont have the text book for this class, the book store ran out or i would just look in there for examples.

4. Aug 26, 2009

### Staff: Mentor

Re: Engineering question about angle??

One step at a time. You haven't gotten to the resultant force yet. You're still finding the x-component of F1: F1x = 8 sinθ. Now find F1y, F2x, and F2y.

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