A rod is 2m long is initially at a temperature of 10 degrees c. Find the expansion of the rod when the temperature is raised to 100 degrees c. If this expansion is prevented, find the stress induced in the material of the rod. Take E= 105kN\mm2 and co efficient of thermal expansion a= 1.2×10 raised to negative 5 per centigrade

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.