# Finding Tensions (3 strings and 1 mass)

1. Nov 17, 2012

### Prima

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

In the picture, what are the tensions in strings 1, 2, and 3?

http://www.flickr.com/photos/90172232@N04/8194075362/

2. Relevant equations

3. The attempt at a solution

I know string 3 is obviously 200N. I forget how to solve for the other strings. Do I add vectors here? string 1 = ?*sin(70) perhaps. Can somebody just point me in the right direction with this?
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Nov 17, 2012

### haruspex

At the junction, you have some forces acting. There is no acceleration. Draw a free-body diagram for the junction and write out equations representing the lack of acceleration.

3. Nov 17, 2012

### tiny-tim

Welcome to PF!

Hi Prima! Welcome to PF!

Start by giving things names

call the tensions T1 and T2.​

Then write the equations for components in the x and y directions.

(alternatively, draw a vector triangle)