One crystalline form of silica (sio2) has a cubic unit cell, and from x-ray diffraction data it is known that the cell edge length is 0.700 nm. if the measured density is 2.32 g/cm3, how many

(a) si4+ and

(b) o2- ions are there per unit cell? the atomic weights of si and o are, respectively, 28.09 g/mol and 16.00 g/mol.

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines

Water vapor initially at 10 bar and 400 °c is contained within a piston-cylinder assembly. the water lost heat to the surrounding according to isochoric (iso-volumetric) process until its temperature is 150 °c. the water is then condensed isothermally to saturated liquid. for the water as a system, calculate the work in kj/kg