The density and associated percent crystallinity for two poly(ethylene terephthalate) materials are as follows: rho (g/cm3 ) crystallinity (%) 1.408 74.3 1.343 31.2 (a) compute the densities of totally crystalline and totally amorphous poly(ethylene terephthalate). (b) determine the percent crystallinity of a specimen having a density of 1.382 g/cm3 .

Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise

Burgers vector is generally parallel to the dislocation line. a)-true b)-false

Atmospheric air has a temperature (dry bulb) of 80° f and a wet bulb temperature of 60° f when the barometric pressure is 14.696 psia. determine the specific humidity, grains/lb dry air. a. 11.4 c. 55.8 d. 22.5 b. 44.1