physics help

posted by .

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

i tried to solve for part a and i got 1.92 and it was worng using thre equation force divided by area plaease help me. what would the right answer be

  • physics help -

    Your formula is correct, but you forgot to take care of the exponents (10^4=10000, etc.)

    Someone has asked the same question, and the response is here.
    http://www.jiskha.com/display.cgi?id=1289886124

  • physics help -

    i tried to answer part b but not 100 percent sure what the young modulus is for bone i know part a is 1.92E8. please help how to solve part b

  • physics help -

    If you read the article given in the link, you will realize that Young's modulus for bone is variable, depending on many factors, one of which is bone density.

    Such information for a physics question would normally be supplied, but for completeness, the answer to part b had been completed, using an average value of 20 GPa.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. college physics

    From what maximum height can a 61 kg person jump without breaking the lower leg bone of either leg?
  2. physics help please!!!

    From what maximum height can a 61 kg person jump without breaking the lower leg bone of either leg?
  3. physics please help

    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 …
  4. help me physics

    The femur is a bone in the leg whose minium cross-sectional area is about 3.60 E-4 m2. A compressional force in excess of 6.90 E4 N will fracture this bone. (a) Find the maximum stress that this bone can withstand. 1 N/m2 (b) What …
  5. Physics

    Consider a human femur of length L = 469 mm. Model the bone as a hollow cylinder, with inner radius Ra = 4.17 mm and outer radius Rb = 12.51 mm. If a 74 kg person's weight is supported by one leg, calculate the stress on the femur; …
  6. physics

    The maximum applied force of compression that one man’s thighbone can endure without breaking is 7.6 x104 N. The minimum effective cross-sectional area of the bone is 3 x10-4 m2, its length is 0.54 m, and Young’s modulus is Y=9.4x109 …
  7. Physics

    A force compresses a bone by 0.10mm. A second bone has the same length but twice the cross-sectional area as the first. By how much would the same force compress the bone?
  8. Physics

    A femur is a bone in the leg whose minimum cross sectional area is about 4.0 x 10^-4 m^2. A compressional force in excess of 6.8 x 10^4 N will fracture this bone. A.) Find the maximum stress that this bone can withstand and B.) What …
  9. physic

    Depending on how you fall, you can break a bone easily. The severity of the break depends on how much energy the bone absorbs in the accident, and to evaluate this let us treat the bone as an ideal spring. The maximum applied force …
  10. physics

    If a compressive force of 3.2×104N is exerted on the end of a 16cm long bone of cross-sectional area 4.4cm2 , by how much does it shorten?

More Similar Questions