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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?!

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# Help! Heat Loss

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