Tension and compression forces on a femur bone

[mishelhad]

Summary:: Hello all,
I need help with this question, ill attach the equations i managed to solve.
How do i continue from there?

 

[Chestermiller]

The stress should be expressed as N/m^2.

I have no idea how you determined the moment, but it certainly is not determined by the equation that you employed. It should be the force times the moment arm.

 

[onatirec]

Looks like they found the axial stress and set it equal to the bending stress, which is incorrect. They should each be solved for by their respective equations.

I don't think there's anything inherently wrong with N*mm^-2, which is MPa, as long as the units are properly tracked. That said, the final answer doesn't even have any units with it.