Below 24.5 k, ne is a crystalline solid with an fcc structure. the interatomic interaction energy per atom can be written as ev14511(ev/atom) where and ơ are constants that depend on the polarizability, the mean dipole moment, and the extent of overlap of core electrons. for crystalline ne, 1-3121 x 10-3 ev and ơ 0.274 nm. a. show that the equilibrium separation between the atoms in an inert gas crystal is given by ro (1.090)o. what is the equilibrium interatomic separation in the ne crystal? b. find the bonding energy per atom in solid ne c. calculate the density of solid ne (atomic mass 20.18).

Around steel bar, 20 mm in diameter and 400 mm long, is placed concentrically within a brass long. tube which has an outside diameter of 30 mm and thickness 4 mm. the tube is 400 mm the upper end of the vertically placed compound bar is rigidly fixed and a collar is fitted to the bottom end. the application of a load p results in the compound rod storing a total of 5 j of energy.calculate (a) the gradually applied load; (b) the suddenly applied load; (c) the impact load that falls 100 mm and induces 5 j of energy; (d) the instantaneous stresses in both materials; and (e) the instantaneous elongation of the compound rod (egt = 200 gpa and egr = 100 gpa).