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physics please help

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The femur is a bone in the leg whose minimum cross-sectional area is about 3.60 10-4 m2. A compressional force in excess of 6.90 104 N will fracture this bone.

(a) Find the maximum stress that this bone can withstand.

(b) What is the strain that exists under a maximum-stress condition

  • physics please help -

    (a) Stress = Force/Area
    = 6.90 10^4/3.60 10^-4 m2
    = ___ N/m^2 (or Pascals)

    (b) You need Young's modulus (E) for bone material. You will have to look it up. It probably varies with type of bone and the person's age.

    Strain = Stress/E

    See http://www.engin.umich.edu/class/bme456/bonefunction/bonefunction.htm

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