The thermal conductivity of a sheet of rigid, extruded insulation is reported to be k = 0.029 W/m·K·The meas- ured temperature difference across a 25-mm-thick sheet of the material is T1-T2 12°C. (a) What is the heat flux through a 3 m x 3 m sheet of the insulation? (b) What is the rate of heat transfer through the sheet of insulation? (c) What is the thermal resistance of the sheet due to conduction?