A50 wt% ni–50 wt% cu alloy is slowly cooled from 1400°c (2550°f) to 1200°c (2190°f).
(a) at what temperature does the first solid phase form?
(b) what is the composition of this solid phase?
(c) at what temperature does the liquid solidify?
(d) what is the composition of this last remaining liquid phase?

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.