I Place a 500-G Ice Cube (Initially at 0 $\degree$ C)in a Styrofoam Box with Wall Thickness 1

question 7

Multiple Choice

I place a 500-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 4 hours the ice is completely melted,what is the conductivity of the Styrofoam material? (L_f = 80 cal/g)

• A)9.6 x 10^-5 cal/s*cm* \(\degree\)C
• B)2.8 x 10^-6 cal/s*cm* \(\degree\)C
• C)1.15 x 10^-2 cal/s*cm* \(\degree\)C
• D)2.3 x 10^-4 cal/s*cm* \(\degree\)C

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