Derek lives in a place that frequently experiences natural disasters. The city mayor asked Derek to design a government structure that can sustain disasters. With which material should Derek embed the concrete that he will use for building the structures? A. wood B. steel C. brick D. stone E. vinyl

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.