16Jun/100
Metal Wire
A Metal Wire is in thermal contact with two heat reservoirs at both of its ends. Reservoir 1 is at a temperatu
A metal wire is in thermal contact with two heat reservoirs at both of its ends. Reservoir 1 is at a temperature of 527 K, and reservoir 2 is at a temperature of 379 K. What is the change in entropy (in J/K) of Reservoir 1 arising from the conduction of 1202 J of heat through the wire.
answer: -2.28
i know the answer but need to know the steps ...plz help, need to study for exam..thanks
♦ entropy change ΔS =∫ Q’(t)*dt/T(t) {for t=0 until t1}, where t is time, t1 is duration of process, T(t) is temperature of tub#1 during process, Q’(t) is rate of heat transfer;
we are lucky to have an easy problem because temperature in tub#1 remains const;
♥ thus ΔS = (1/T) ∫ dQ {for Q=0 until 1202 J} =
= 1202/527 = 2.28 J/1°;
Metal wire puzzle double loop
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