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For your cabin in the wilderness, you decide to build a
Chapter 17, Problem 99P(choose chapter or problem)
For your cabin in the wilderness, you decide to build a primitive refrigerator out of Styrofoam, planning to keep the interior cool with a block of ice that has an initial mass of 24.0 kg. The boxhas dimensions of 0.500 m × 0.800 m × 0.500 m Water from melting ice collects in the bottom of the box. Suppose the ice block is at 0.00 °C and the outside temperature is 21.0°C, if the top of the empty boxis never opened and you want the interior of the boxto remain at 5.00°C for exactly one week, until all the ice melts. What must be the thickness of the Styrofoam?
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QUESTION:
For your cabin in the wilderness, you decide to build a primitive refrigerator out of Styrofoam, planning to keep the interior cool with a block of ice that has an initial mass of 24.0 kg. The boxhas dimensions of 0.500 m × 0.800 m × 0.500 m Water from melting ice collects in the bottom of the box. Suppose the ice block is at 0.00 °C and the outside temperature is 21.0°C, if the top of the empty boxis never opened and you want the interior of the boxto remain at 5.00°C for exactly one week, until all the ice melts. What must be the thickness of the Styrofoam?
ANSWER:Solution 99P For water 3 Lf= 334 × 10 kg For styrofoam k=0.01 W/m.K One week i= 7 × 24 × 60 × 60 = 604800 s The surfa