Cross section help on compression calc

  • Thread starter jphillip
  • Start date
  • #1
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Homework Statement



The Femur bone in the human leg has a minimum effective cross section of about 3.0 cm2 How much compressible force can it withstand before breaking

Homework Equations



Compressive Strength (bone)(N/m2) = 170 x 106
P = F/A

The Attempt at a Solution


Not sure what a cross section is exactly, how should A in formula Stress = F/A be written when they state 3 cm2 cross section.
A = PI*R2

which one do I use for R
A = .0152
A = .03
A = .032

170 x 106 = F / .03m2
 

Answers and Replies

  • #2
218
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The A in the formula is the cross sectional area. The cross section is a "slice" of the object in question. For example, if you cut into an apple, the resulting flat shape you see would be a cross section of the apple.
 
  • #3
3.0cm^2 * (1m/100cm)^2 = 0.0003m^2 which is the cross sectional area of the bone.
 

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