Help! Heat Loss!!! A cup of coffee (with a lid) is enclosed in an insulated cup 0.5cm thick in the shape of a cube 13.1cm on a side. The thermal conductivity of the cup is 0.0002 cal/s*cm*DegreeC. The temperature of the coffee is 87C and the temperature of the surroundings is 14C. Find the heat loss due to conduction. Answer in units of J/s. I've tried P=kA(Th-Tc)/L ------> Energy transfer by conduction but somehow it's wrong? I see no other way! I know that: k = 0.0002cal/s*cm*DegC which = 0.0008372J/s*cm*DegC L=0.5cm A=13.1cm*13.1cm (because cube) A=171.61 cm^2 Th=87C Tc=14C ANY IDEAS?!