I've got a homework problem that starts like so:(adsbygoogle = window.adsbygoogle || []).push({});

Assume that Young's Modulus is 1.5 x 10^10 N/m^2 for bone and that the bone will fracture if stress greater than 1.5 x 10^8 N/m^2 is imposed on it.

If the effective diameter of the bone is 2.5cm, what is the maximum force that can be imposed on it (before breaking, I assume)

Here's what I've done:

A=(.0125m)2π = 4.91*10^-4 m^2

1.5*10^8 N/m^2 = F/A

1.5*10^8 N/m^2 = F/(4.91*10-4m^2)

3.055*10^11 = F

Problem is, that's a completely off-the-wall figure to get. It equates to about 68 billion pounds, and I know that bone would break well before then. I assume that the Young's Modulus provided isn't perfect, but couldn't bethatfar off.

So where did I go wrong?

Thanks in advance,

-Reisen

Edit: I got it, finally. Apparently, Algebra > Me

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# Homework Help: Young's Modulus/Breaking Point

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