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Q.

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

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a

10 J

b

40 J

c

20 J

d

70 J

answer is A.

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Detailed Solution

Q=Uf−Ui+W⇒−30=Uf−30+(−10)⇒Uf=10J

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