A submerged steel-reinforced concrete block, with a specific weight of 164 lbf/ft3, is needed to keep the 2 foot-wide gate in a closed position when the depth, H, of the liquid is 4.4 feet. The block is connected to the gate by a cable and system of pulleys. The specific gravity of the liquid is 0.98. The gate pivots about point A. To 3 significant digits, the minimum volume of the submerged concrete block is (if the third digit is a zero, make sure you include it)

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?