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Center of Mass

  • #1

Homework Statement


Determine the position of the center of mass of a whole leg (a) when stretched out, and (b) when bent at 90°. Assume the person is 1.70 m tall.

Homework Equations


cm_def_big.gif


The Attempt at a Solution


This is where I'm stuck...what's the mass? I doubt I can just use variable m because the mass is different parts of the leg. Also, when the problem says that the person is 1.7 m tall, should I use that for leg length and assume they meant leg length instead of height?
 

Answers and Replies

  • #2
23
7
Is that all the information you are given? No diagram or anything? I think I would be led to believe that the point about the person being "1.70m tall" is some sort of red herring.
 
  • #3
Yes, sadly that's all the information I'm given, not even a diagram.
 
  • #4
gneill
Mentor
20,795
2,773
There's probably some standard body part model used in kinesiology and the like. No doubt there are mass models for sections of each limb, and I wouldn't be surprised if there's some sort of height index to scale the model.

Where does this problem come from?
 
  • #5
It's from my physics homework :cry:.
 
  • #6
23
7
I would guess that your professor assigned you this piece of work but forgot to reference where you could find the question in your textbook, maybe you'll find more information there :oldtongue:
 

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