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  • When 30J of work was done on gas, 20J of heat energy was released. If the initial energy of the gas was 40J, what is the  final internal energy (In J)Option

When 30J of work was done on gas, 20J of heat energy was released. If the initial energy of the gas was 40J, what is the  final internal energy (In J)

Option: 1

50


Option: 2

30


Option: 3

40


Option: 4

20


Answers (1)

best_answer

As we learnt

 

Sign of dU (internal energy) -

 

If internal energy increases then dU is positive, if internal energy decreases then dU is negative.

- wherein

dU> 0 (if  U_{f}> U_{i} )

dU< 0 (if  U_{f}< U_{i})

 

 

\Delta U=Q-W= (-20)-(-30)= 10J

\Delta U is positive so internal energy is increasing.

\Delta U= U_f-U_i= 10\Rightarrow U_f-40=10

U_f=50J

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