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In a thermodynamics process the pressure of a certain  mass of a gas is changed in such a way that 30 J heat  is released from it and 10 J work is done on the gas. If the initial internal energy of the system is 30 J then final internal energy is

a
10 J
b
40 J
c
20 J
d
70 J

detailed solution

Correct option is A

Q=Uf−Ui+W⇒−30=Uf−30+(−10)⇒Uf=10J

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