Tension in a cable

  • Thread starter datphysics
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  • #1
datphysics
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Homework Statement


Im having trouble understanding how to find the tension 'T' and pretty much answering the question on the .jpg file i have attached


Homework Equations


ƩFx=0, ƩFy=0, τ=r x F


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!
 

Attachments

  • question 17,18..jpg
    question 17,18..jpg
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Answers and Replies

  • #2
Doc Al
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For question 17 i have:
TLsinθ - w(l/2cosθ)-w(Lcosθ)= 0 (*because net sum of torques =0*)
Good. That will give you the tension. What about the other conditions for equilibrium?
 
  • #3
datphysics
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Umm i have no idea what are the other conditions of an equilibrium are..
 
  • #4
Doc Al
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Umm i have no idea what are the other conditions of an equilibrium are..
You posted them under "Relevant Equations". :smile:
 
  • #5
datphysics
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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:
  • #6
Doc Al
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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
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.
 

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