A Styrofoam Cooler Has a Surface Area of 2,700 Cm²

question 37

Multiple Choice

A Styrofoam cooler has a surface area of 2,700 cm² and a wall thickness of 3.00 cm. Styrofoam has a thermal conductivity of 0.010 W/m °C. A 2.00 kg block of ice is placed inside the cooler that has a temperature inside of 2°C. When the temperature outside is 30.0°C, the ice lasts for 8.00 hours. If the temperature outside becomes 20.0°C, then how long will the ice last? Ignore the effect of the air inside the cooler.

• A) 20.3 hr
• B) 18.5 hr
• C) 12.4 hr
• D) 10.1 hr
• E) 8.5 hr

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