When a system is taken from state ' a ' to state ' c ' along a path abc, it is found that Q = 80 cal and W = 35 cal. Along path adc Q = 65 cal the work done W along path adc is (a) 20 cal. (b) 35 cal. (c) 45 cal. (d) 65 cal.

Answer: (a). Δ U is path independent: Δ U = Q - W = 80 - 35 = 45 cal. Path adc: W = Q - Δ U = 65 - 45 = 20 cal So the answer is (a) 20 cal.

When a system is taken from state ' a ' to state ' c ' along a path… | MHT CET 2024 (15 May, Shift 1)

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P-V Diagrams & Cyclic Processes

When a system is taken from state ' $a$ ' to state ' $c$ ' along a path abc, it is found that $Q = 80\text{ cal}$ and $W = 35\text{ cal}$ . Along path adc $Q = 65\text{ cal}$ the work done W along path adc is

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Answer: (a)

$\Delta U$ is path independent: $\Delta U = Q - W = 80 - 35 = 45\ \text{cal}$ .
Path adc: $W = Q - \Delta U = 65 - 45 = 20\ \text{cal}$
So the answer is (a) 20 cal.

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