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Coffee is in an insulated cup 0.5 cm thick in the shape of a cube 10 cm on a side. The cup has a very small opening (its area is much smaller than the area of a square wall) through which coffee can be drunk. The temperature of the coffee is 95^oC and the surrounding temperature is 21^oC. Find the ratio of the heat loss due to conduction to the heat loss due to the radiation. Assume the emissivity of 1.0 and the thermal conductivity of cup of 2 x 10^-4 cal/cm.s.°C. 1 x 10^-3.

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