Air flows through a constant area duct. at the inlet to the duct the stagnation pressure is 600 kpa and the stagnation temperature 200°c. if the mach number at the inlet of the duct is 0.5 and if the flow is choked at the exit of the duct, determine the heat transfer per unit mass and the exit temperature. assume that friction effects can be neglected.

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?