A converging-diverging frictionless nozzle is used to accelerate an airstream emanating from a large chamber. The nozzle has an exit area of 30 cm2 and a throat area of 15 cm2 . If the ambient pressure surrounding the nozzle is 101 kPa and the chamber temperature is 500 K, calculate the following:. (a) Minimum chamber pressure to choke the nozzle
(b) Mass flow rate for a chamber pressure of 400 kPa

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?