Determine the moment of this force

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

M = r X F

The Attempt at a Solution

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So, .... where is your work?

tiny-tim
Homework Helper
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! 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:
tiny-tim
Homework Helper
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!

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

tiny-tim
Homework Helper
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

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

tiny-tim
Homework Helper
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