It is found that the stress tensor at any point (x, y, z) in a certain continuous medium has the form (with an unspecified, convenient choice of units) XZ z2 0 = [ z2 —y 0 _ (16.145) Find the surface force on a small area dA of the surface x 2+ y 2+ 2z2= 4 at the point (1, 1, 1)
