Question

A gas is compressed at a constant pressure of 20 Nm 2 from a volume of 10m to a volume of 5m?. Later energy of 100J is added to the gas by
heating it. What is the change in internal energy
(A) 100 J
(B) 200 J
(C) 300 J
(D) 400 J​

Answer 1

Answer:

D) 400 J

Explanation:

Change in volume △V

2

−V

1

=4−10=−6m

3

A volume decreases, work is done on the gas and so it is negative.

W=p△V=50×(−6)=−300J

Additional heat supplied (G=+100J). So, for the first law of thermodynamics change in external energy is given by

△U=Q−W=100−(−300)=400J

Internal energy increases by 400 J.

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