Aconcrete column has a diameter of 360 mm and a length of 3 m . if the density (mass/volume) of concrete is 2.45 mg/m3, determine the weight of the column in pounds.

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.