A polystyrene esky is used to keep cans of drink cold while at the beach. The es

Question

A polystyrene esky is used to keep cans of drink cold while at the beach. The esky has a total surface area (including the lid) of 0.9 m2 and the walls and lid have a thickness of 5.0 cm. In the morning it is filled with ice, water and cans of drink, all at 0 oC.

a) What is the rate of heat flow into the esky assuming that the outside is a constant 42 oC? (The thermal conductivity of polystyrene is 0.01 W m-1 K-1.)

b) How much ice will melt during your 5 hours at the beach?

can you please show the formula used in the salution

Explanation / Answer

a)q=kAΔT/l=0.01*1.1*37/0.04=10.175Wb)Heat flowing in 5 hours=qt=10.175*5*3600=183150JIce melted=Q/L=183150/334000=0.548kg=548g

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