- #1
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Discussion Overview
The discussion revolves around determining the moment of a force applied to a total hip replacement, specifically calculating the moments about two points, A and B. The context is primarily homework-related, with participants seeking assistance in solving the problem and clarifying their understanding of the concepts involved.
Discussion Character
- Homework-related
- Technical explanation
- Conceptual clarification
Main Points Raised
- One participant states the problem involves a force of F = 120N and seeks to determine the moment about points A and B using the equation M = r X F.
- Several participants request to see the original poster's work to provide more targeted help.
- Another participant expresses being stuck on the problem and asks for guidance on how to proceed.
- A participant confirms the moment about point A is calculated correctly but notes the need for additional information to determine the moment about point B.
- There is a suggestion to extend a line from a given angle to find the necessary distances for calculating the moment about point B.
- One participant realizes they misinterpreted the diagram and discusses how to find the required distances using angles provided in the problem.
Areas of Agreement / Disagreement
Participants generally agree on the need to show their work to receive assistance. However, there is no consensus on how to proceed with the calculations for point B due to missing information in the problem statement.
Contextual Notes
The discussion highlights limitations regarding the clarity of the diagram and the specific distances needed to calculate the moment about point B, which are not provided in the original problem statement.
- #2
Dr.D
- 2,411
- 723
So, ... where is your work?
- #3
tiny-tim
Science Advisor
Homework Helper
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Welcome to PF!
Hi yosheey ! Welcome to PF!
Show us what you've tried, and where you're stuck, and then we'll know how to help!
Hi yosheey ! Welcome to PF!
Show us what you've tried, and where you're stuck, and then we'll know how to help!
- #4
jining
- 3
- 0
Hi! I am stuck on this problem too, is there anyone that would mind showing me how to do it? My group and I are stuck.
Last edited:
- #5
tiny-tim
Science Advisor
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welcome to pf!
hi jining! welcome to pf!
(you know what I'm going to say, don't you? …)
Show us what you've tried, and where you're stuck, and then we'll know how to help!
hi jining! welcome to pf!
(you know what I'm going to say, don't you?
…)Show us what you've tried, and where you're stuck, and then we'll know how to help!
- #6
jining
- 3
- 0
Hello! Thanks!
Um, so I managed to get the moment about a, but I don't know what to do for b
http://imgur.com/Wx939
- #7
tiny-tim
Science Advisor
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hello jining!
yes, your moment about A looks fine (you drew that 5° really large … good idea!
)
for the moment about B, do it the same way, extending that 15° line until it gets near B …
but of course you need to know how far down B is, and the question doesn't tell you
yes, your moment about A looks fine (you drew that 5° really large … good idea!
) for the moment about B, do it the same way, extending that 15° line until it gets near B …
but of course you need to know how far down B is, and the question doesn't tell you
- #8
jining
- 3
- 0
Yea... :| that's where I am stuck haha .. any ideas? Thanks for the help.
- #9
tiny-tim
Science Advisor
Homework Helper
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oh i see now, i wasn't looking at the diagram properly 
…
you can find how far that 150° point is to the right, then use the 10° to find how far down it is from there to B
…you can find how far that 150° point is to the right, then use the 10° to find how far down it is from there to B
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