A thermodynamic process is shown in Figure 3.80. The pressures and volumes at some points are P A = 3 × 1 0 4 Pa, V A = 2 × 1 0 − 3 m 3 , P B = 8 × 1 0 4 Pa, V D = 5 × 1 0 − 3 m 3 . In process

Question

A thermodynamic process is shown in Figure 3.80. The pressures and volumes at some points are $P_{A} = 3 \times 1 0^{4}$ Pa, $V_{A} = 2 \times 1 0^{- 3}$ $m^{3}$ , $P_{B} = 8 \times 1 0^{4}$ Pa, $V_{D} = 5 \times 1 0^{- 3}$ $m^{3}$ . In process $A B$ , 600 J of heat and in process $BC$ , 200 J of heat is added to the system. The change in internal energy of the system in process $A C$ would be:

TestHub · Accepted Answer

A B is isochoric, so Δ U A B ​ = 600 J. In BC (isobaric) the work is P B ​ ( V D ​ − V A ​ ) = 8 × 1 0 4 × 3 × 1 0 − 3 = 240 J, so Δ U BC ​ = 200 − 240 = − 40 J. Δ U A C ​ = 600 − 40 = 560 J. A.

Physics - Heat & Thermo Question with Solution | TestHub

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