Acylindrical specimen of some metal alloy 10 mm (0.4 in.) in diameter is stressed elastically in tension. a force of 15,000 n (3370 lbf) produces a reduction in specimen diameter of 7 x 10 ^-3 mm (2.8 x 10^-4 compute poisson’s ratio for this material if its elastic modulus is 100 gpa ( 14.5 x 10^6 psi).

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

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

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.