1.

The Boussinesq equation representing the vertical stress is ___________

A. ( _z= frac{3}{2 } left[ frac{1}{1+( frac{r}{z})^2} right]^{5/2} )
B. ( _z= frac{3Q}{2 } left[ frac{1}{1+( frac{r}{z})^2} right]^5 )
C. ( _z= frac{3Q}{2 z^2} left[ frac{1}{1+( frac{r}{z})^2} right]^{ frac{5}{2}} )
D. ( _z= frac{3Q}{2 } left[ frac{1}{1+( frac{r}{z})^2} right]^2 )
Answer» D. ( _z= frac{3Q}{2 } left[ frac{1}{1+( frac{r}{z})^2} right]^2 )


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