- #1

lokobreed

- 15

- 0

I am not posting in the homework sections because its not for homework although I will gie an example of a problem... I just want to understand why/how they use these to find the force/tension...

Example:

A 20 kg loudspeaker is suspended 2m below the celing by two cables that are each 30* from vertical. What is the tension in the cables?

For this I will cable 1 T1 and cable 2 T2.

So to find the X compenent of forces

since the x would use the 30 degree angle and it would be using the hyp and adjacent sides I will use the cos of the angle to find them

-T1x + T2x = 0 N --> -T1 COS 30 + T2 Cos 30 = 0

Now where I am confused is how to find the Y compent and why you would do it the way you do... I know you use sin but I just don't understand how you can use the opposite angle if it is not known... perhaps I am missing something ... please help!