Human Bone Youngs Modulus and Load Question

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SUMMARY

The Young's modulus of human bone is established at 1010 N/m2, with a fracture threshold occurring at a compressive strain exceeding 1%. For a bone with a cross-sectional area of 3 cm2, the maximum load it can sustain is calculated using the formula F = Y * (change in length/original length) * cross-sectional area. The correct calculation yields a maximum load of 30,000 Newtons, confirming that the initial confusion regarding unit conversion and the modulus value was clarified during the discussion.

PREREQUISITES
  • Understanding of Young's modulus and its application in material science
  • Knowledge of basic mechanics, specifically force and strain calculations
  • Familiarity with unit conversions, particularly between cm2 and m2
  • Proficiency in algebraic manipulation of equations
NEXT STEPS
  • Study the principles of material mechanics, focusing on Young's modulus
  • Learn about unit conversions in physics, especially for area and force
  • Explore the implications of strain and stress in biological materials
  • Investigate the mechanical properties of different types of bone and their applications in biomedical engineering
USEFUL FOR

This discussion is beneficial for students studying biomechanics, material science, and engineering, as well as professionals involved in orthopedic research and development.

ElBell
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Homework Statement



A human bone has a youngs modulus of 10^10 N m^-2. It fractures when the compressive strain exceeds 1%. What is the maximum load that can be sustained by a bone of cross sectional area 3cm^2?

Homework Equations

?

F= Y*(change in length/ original length)* cross sectional area



The Attempt at a Solution



F= (10*10^10)* (1/100)* (3^2)

I then get the answer 9* 10^8

I don't understand what units I am supposed to use...and if this answer appears correct or not.

Can anyone shed any light? Have I done this correctly?

TIA! :)
 
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you can't use cm^2 your constant is in N/m^2, also you don't square it...
 
i get 30000N Newtons is the unit from your actual question
ps Y is 10^10 not 10*10^10 could be a typo??
 
When I take onboard the tips you have given me, I get the same answer as you! I thought (10* 10^10) was the same as (10^10)?

Anyway, I also received an answer of 30000.

Is that the final answer? Do I need to do something with the results? Isnt that too big?
 
not really sure what you mean, that is the answer... units of force are Newtons. and who did you receive an answer form... teacher?
 
No I didnt receive an answer from teacher, I formulated it myself but it appears I didnt get it right!

Thanks so much for your help, I know I am lacking the basic knnowledge for this but I am doing my best :)
 

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