Static equilibrium; pulley and inclined plane problem.

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Homework Help Overview

The problem involves a static equilibrium scenario with a pulley system and an inclined plane, focusing on determining the weight WB that will maintain equilibrium while neglecting friction and other assumptions.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants discuss the calculation of tensions and resultant forces, with some expressing confusion over the conversion of units and the implications of different weight measurements.

Discussion Status

The discussion includes attempts to clarify the calculations related to weight and tension, with some participants providing feedback on the correctness of the values obtained. There is an ongoing exploration of unit conversions and their impact on the results.

Contextual Notes

Participants are navigating issues related to unit conversions between English and metric systems, and there is mention of assumptions made in the problem setup, such as neglecting friction.

J-dizzal
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Homework Statement


What weight WB will cause the system to be in equilibrium? Neglect all friction, and state any other assumptions.
20150703_125114_zpskvhgwrb0.jpg

Homework Equations


ΣF=0

The Attempt at a Solution


I can't figure out what I am doing wrong with these pully problems, I tried putting in resultant forces at pully A, but that just added another variable.[/B]
20150703_124617_zpsxzgyk5c7.jpg
 
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You should check the Wb is Tb or ___ ?
 
I did a redo of the tensions this time starting from A going to B, I am still missing something though. solving for weight at B i got 8.72lb (on the right side of my paper)
20150703_131312_zps5z8gcb8z.jpg
 
It seems correct to me.
 
Thyphon said:
It seems correct to me.
Yea, but I am still missing something, its not the correct answer.
 
Oh, find the F again you will see the wrong :) 79,5 N or kg ?
 
Thyphon said:
Oh, find the F again you will see the wrong :) 79,5 N or kg ?
If the weight of block A is 175 lb that is equal to 79.5N
 
ok i got, my mistake was trying to convert from english to standard, i should of just left it in english. thanks thypon.
 
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No, 1lb is equal to 0,453 kg, so 175lb =79,27 kg
N means kg*m/(s^2)
 
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  • #10
Thyphon said:
No, 1lb is equal to 0,453 kg, so 175lb =79,27 kg
N means kg*m/(s^2)
i got confused because 175 lb of weight = 175 lb mass.
 
  • #11
Is it okay now ?
 
  • #12
Thyphon said:
Is it okay now ?
yea its correct now. thanks
 
  • #13
Why is the tension T/2?
 

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