Air is blown through a large wind tunnel by a 5m diameter circular fan. if the air velocity just downstream of the fan is 2.5m/s, what will be its velocity at a 1.5m square section further down the wind tunnel? a7 [2] a) 18.3m/s 17.4m/s b) 2.5m/s 250m/s 21.81m/s

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?