- #1
M_J
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Homework Statement
The force on a knee cartilage can cause a large force to deform it. The cartilage area is 11cm^2 and the shear modulus is 12MPa. Max force at impact is 904N at an angle of 12 degrees with the cartilage, through what angle (in degrees) will the cartilage be deformed?
Homework Equations
http://session.masteringphysics.com/problemAsset/1026529/6/yg.11.35.jpg
Shear modulus = Stress/Strain
Stress = F(perpendicular)/A
Strain = x/h
The Attempt at a Solution
Stress = 904sin(12)/11x10^-4
Strain = 0.0142
h=11x10-2 ??
angle = tan^-1(0.0142/11x10-2) = 7.4
This method appears a little wrong, is someone able to point out where I have gone wrong and how I should have got to the answer? Thanks! :-)