Calculate the equilibrium concentration of vacancies, nv, per cubic meter in pure copper at 850°c. assume that the energy of formation of a vacancy in pure copper is 1.3 ev. (density of copper = 8.96 × 106 g/m3, boltzmann constant = 8.62 × 10-5 ev/k, and atomic mass of copper = 63.54 g/atomic mass.)

Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.

Select any two (2) areas of applications of chain-drive. (clo4) a)-permanent lubrication necessary b)-hydraulic forklift truck operation c)-rigging and heavy moving materials d)-relatively high maintenance costs e)-costlier than belt drives