Finding Tensions (3 strings and 1 mass)

  • Thread starter Prima
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  • #1
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Homework Statement



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

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

Homework Equations





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?

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
haruspex
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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
tiny-tim
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Welcome to PF!

Hi Prima! Welcome to PF! :smile:

Start by giving things names

call the tensions T1 and T2.​

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

(alternatively, draw a vector triangle)
 

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