A gas at 2 × 1 0 5 Pa and 1 m 3 expands isobarically to 1.6 m 3 . Then in an isochoric process its pressure is raised to 3 × 1 0 5 Pa. It is then returned to the initial state with pressure changing l

Question

A gas at 2 × 1 0 5 Pa and 1 m 3 expands isobarically to 1.6 m 3 . Then in an isochoric process its pressure is raised to 3 × 1 0 5 Pa. It is then returned to the initial state with pressure changing linearly with volume. Find the total heat supplied to the gas in the cycle, in joules (negative if heat is lost).

TestHub · Accepted Answer

Δ U = 0 over the cycle, so Q = W = signed loop area. The path A(1, 2 × 1 0 5 ), B(1.6, 2 × 1 0 5 ), C(1.6, 3 × 1 0 5 ) is traversed counterclockwise, so W = − 2 1 ​ ( 0.6 ) ( 1 0 5 ) = − 30000 J. Q = − 30000 J.

Physics - Heat & Thermo Question with Solution | TestHub

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