A supercritical airfoil is designed Group of answer choices A) to allow the normal shock wave to occur where the upper surface pressure gradient is favorable. B) with less curvature on the upper surface. C) to lower the critical Mach number. both A and B above.

In a unit cell of fcc structure, indicate the position of one of the tetrahedral interstitial sites by plotting the corresponding tetrahedron. do the same for one of the octahedral interstitial sites (in a separate fcc unit cell). mark the positions of all the tetrahedral and octahedral interstitial sites in the unit cells. how many equivalent tetrahedral sites and how many equivalent octahedral sites are contained in a fcc unit cell, respectively. what is the coordination number for a tetrahedral site and what is the coordination number for an octahedral site?