# Tension in a cable

1. Jun 9, 2013

### datphysics

1. The problem statement, all variables and given/known data
Im having trouble understanding how to find the tension 'T' and pretty much answering the question on the .jpg file i have attached

2. Relevant equations
ƩFx=0, ƩFy=0, τ=r x F

3. The attempt at a solution
For question 17 i have:
TLsinθ - w(l/2cosθ)-w(Lcosθ)= 0 (*because net sum of torques =0*)

And for question 18 i have no attempts at the question haha.

Help would be much appreciated!

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2. Jun 9, 2013

### Staff: Mentor

Good. That will give you the tension. What about the other conditions for equilibrium?

3. Jun 9, 2013

### datphysics

Umm i have no idea what are the other conditions of an equilibrium are..

4. Jun 9, 2013

### Staff: Mentor

You posted them under "Relevant Equations".

5. Jun 12, 2013

### datphysics

Sorry for the delayed reply but i have completed number 18 but have not completed 17 (been doing other topics, anyways back this topic).

The next part should be: (But im not sure how haha)
3.TLsin60-3/2WLcos60 = 0

Last edited: Jun 12, 2013
6. Jun 12, 2013

### Staff: Mentor

Show your equations for ƩFx = 0 and ƩFy = 0.

Hint: Label the force components exerted by the pivot as Px & Py. You'll solve for those components, of course.