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{"ops":[{"insert":"Questions 3 \u2013 5 refer to the diagram below, which shows composite bars made from sections of\ntwo metals, P and Q, of conductivities of 400 W m -1 K -1 and 200 W m -1 K -1 respectively. P and Q\nare both of cross-sectional area 1.00 X 10 -2 m 2 . The structures are perfectly lagged and a\ntemperature difference of 40 K is set up across their lengths.\n\n40 K\n40 K P\n\nP Q Q\n\n50.0 cm 50.0 cm 50.0 cm\n\nQ3. What is the rate of heat flow under steady state conditions with P and Q in series?\nA) 107 W\nB) 120 W\nC) 480 W\nD) 240 W\nNote that the effective k for a series composite of two slabs, k series = k 1 k 2 \/ (k 1 + k 2 )\nQ4. What is the rate of heat flow under steady state conditions with P and Q in parallel?\nA) 120 W\nB) 480 W\nC) 240 W\nD) 107 W\nNote that the effective k for a parallel composite of two slabs, k parallel = k 1 + k 2\n\n"}]}
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