Determine the moment of this force

  • Thread starter yosheey
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  • #1
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Homework Statement


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

Homework Equations



M = r X F

The Attempt at a Solution



...
 

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Answers and Replies

  • #2
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So, .... where is your work?
 
  • #3
tiny-tim
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Welcome to PF!

Hi yosheey ! Welcome to PF! :wink:

Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
 
  • #4
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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.
 
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  • #5
tiny-tim
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welcome to pf!

hi jining! welcome to pf! :smile:

(you know what i'm going to say, don't you? :wink: …)

Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
 
  • #6
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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
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hello jining! :smile:

yes, your moment about A looks fine (you drew that 5° really large … good idea! :biggrin:)

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 :confused:
 
  • #8
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Yea... :| thats where im stuck haha .. any ideas? Thanks for the help.
 
  • #9
tiny-tim
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oh i see now, i wasn't looking at the diagram properly :redface:

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 :wink:
 

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