Senior Physics - Solutions
Chapter 12. Heat Transfer - Worked Solutions
...to selected Complex Reasoning questions from the OUP text "New Century" Senior Physics - Knowledge, Processes and Reasoning by Walding, Rapkins and Rossiter
The area of the walls = 2x (4 x 2.5) + 2 x (3.5 x 2.5) = 37.5 m2
rate of heat loss R = k(T2 - T1)/d
= 0.8 (25 - 15) 37.5/0.2 = 1500 W
E = P x t = 1500 W x 30 x 60 s = 2.7 x 106 J.
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