Calculating Tension: Homework Statement Q33

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Homework Help Overview

The discussion revolves around calculating the tension in ropes supporting a bag in equilibrium, specifically focusing on the forces acting on the system and the angles involved.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the initial assumptions about the tensions being equal and question the reasoning behind the weight distribution among the ropes. There is mention of using a free-body diagram to clarify the problem setup.

Discussion Status

Some participants have provided critical feedback on the original poster's assumptions and calculations, suggesting a need for reevaluation of the approach. There is an indication that a correct understanding may have been reached, but the specifics of that understanding are not detailed.

Contextual Notes

The problem involves analyzing forces in both vertical and horizontal directions, with emphasis on equilibrium conditions. The original poster's calculations are challenged based on the angles of the ropes and their implications for tension.

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Homework Statement


Question 33. Just T1 and T2 are okay, I know T3
20150720_194737.jpg


Homework Equations


F=ma

The Attempt at a Solution


325/2 = 162.5N

For T1: (162.5)(sin 60)

For T2: (162.5)(sin 40)

Thanks!
 
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And you would be wrong.

The bag is hanging in equilibrium, according to the problem statement, so not only must the sum of the forces in the vertical direction equal zero, the horizontal forces must also be equal and opposite.

You can't blindly assume that the tension in each rope is equal, given the unequal size of the angles the ropes make with the horizontal.
 
This is not correct. Why do you think that the weight is equally supported by the two wires?

Chet
 
Before solving the problem, you need to simplify the problem by using free-body diagram. And then you can realize what is wrong in your equations.
 
thank you guys, I got the right answer.
 

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