# Determine the moment of this force

1. Feb 26, 2009

### yosheey

1. The problem statement, all variables and given/known data
The total hip replacement is subjected to a force of F = 120N.
Determine the moment of this force about the neck at A and at the stem B

2. Relevant equations

M = r X F

3. The attempt at a solution

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Last edited by a moderator: May 12, 2014
2. Feb 26, 2009

### Dr.D

Re: Statics(Moment)

So, .... where is your work?

3. Feb 27, 2009

### tiny-tim

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!

4. Oct 18, 2010

### jining

Re: Statics(Moment)

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: Oct 18, 2010
5. Oct 19, 2010

### tiny-tim

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!

6. Oct 19, 2010

### jining

Re: Statics(Moment)

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. Oct 19, 2010

### tiny-tim

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

8. Oct 19, 2010

### jining

Re: Statics(Moment)

Yea... :| thats where im stuck haha .. any ideas? Thanks for the help.

9. Oct 19, 2010

### tiny-tim

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