How can I apply statics principles to solve a problem with unknown forces?

[scotthands]

Homework Statement

http://aycu38.webshots.com/image/29917/2000751813907860134_rs.jpg

Homework Equations

http://aycu03.webshots.com/image/28722/2000720045713558449_rs.jpg

The Attempt at a Solution

http://aycu07.webshots.com/image/27726/2000735660703319218_rs.jpg

i assumed that there is a 90 degree angle at point B but I'm not sure if that's correct, I'm pretty stumped with this question...i just need a few pointers.

 

[PhanthomJay]

i assumed that there is a 90 degree angle at point B but I'm not sure if that's correct, I'm pretty stumped with this question...i just need a few pointers.

The tension in the cable acts in a direction along its length. You can calculate the angle that it makes at B from the given dimensions using trig. It is not 90 degrees. Once you determine the angle, get the x and y components from your relevant equations, and watch the direction, left or right, up or down.