Young's modulus for bone is 1.5x10^10 N/m^2 and that bone will fracture if more than 1.5X10^8 N/m^2 is exerted.(adsbygoogle = window.adsbygoogle || []).push({});

What is the max force that can be exerted on the femur if the effective diameter is 2.5cm?

[tex]Y=F/A[/tex]

[tex]1.50x10^8N/m^2 =\frac{F}{\pi (0.0125m^2)^2}[/tex]

[tex]F=73631N[/tex]

is that correct?

if this force is applied compressively, by how much does the 25cm long bone shorten?

[tex]\Delta L=\frac{FL}{AY}[/tex]

[tex]\Delta L=\frac{73631N*0.25m}{\pi (0.0125m^2)^2 * 1.5x10^{10} N/m^2}[/tex]

[tex]\Delta L=0.0025m[/tex]

I think I did some of this wrong but I'm not sure how to approch these problems. Any guidance?

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# Homework Help: Young's modulus for bone

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