A Styrofoam Cooler Has a Surface Area of 2,700 Cm² $^{\circ}$

question 74

Multiple Choice

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

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

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