There are 4 people in an Igloo (half shpere) with an r of 2.4m and each person emits 120 watts of heat. How thick must the igloo walls be to maintain an inside tmep of 10C if outside temp is -17.8C. (Heat is only lost in this problem through conduction) k of ice blocks is 0.32j/smC. Assume no heat is lost throught the ground Cross section area of sphere 2pi(r)^2

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