I Place a 250-G Ice Cube (Initially at 0 $\degree$ C) in a Styrofoam Box with Wall Thickness 1

question 71

Multiple Choice

I place a 250-g ice cube (initially at 0 $\degree$ C) in a Styrofoam box with wall thickness 1.0 cm and total surface area 600 cm². If the air surrounding the box is at 20 $\degree$ C and after 2 hours the ice is completely melted, what is the conductivity of the Styrofoam material? (L_f = 80 cal/g)

• A) 9.6 *10^-5
• B) 2.8 * 10^-6
• C) 1.15 * 10^-2
• D) 2.3 *10^-4

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