A Cup of Coffee Is Enclosed on All Sides in an Insulated

question 16

Multiple Choice

A cup of coffee is enclosed on all sides in an insulated container 1/2 cm thick in the shape of a cube 10 cm on a side. The temperature of the coffee is 95 $\degree$ C, and the temperature of the surroundings is 21 $\degree$ C. Find the rate of heat loss (in J/s) due to conduction if the thermal conductivity of the cup is 2 *10-4 cal/s.cm. $\degree$ C.

• A)62
• B)74
• C)230
• D)160
• E)12

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