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Q.

In a thermodynamical process pressure of fixed mass of gas is changed in such a way that the gas molecules give out 30 J of heat and 10 J of work is done on the gas. If the internal energy of the gas was 40 J, the final internal energy will be:

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a

zero

b

80 J

c

20 J

d

-20 J

answer is C.

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Detailed Solution

dQ = du + dw-30 = UdQ =U2-U1+dw -30 =U2-40 -10 U2=20 J
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In a thermodynamical process pressure of fixed mass of gas is changed in such a way that the gas molecules give out 30 J of heat and 10 J of work is done on the gas. If the internal energy of the gas was 40 J, the final internal energy will be: