First slide

First law of thermodynamics

Question

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

Easy

A

10 J
B

40 J
C

20 J
D

70 J

Solution

$\begin{array}{l} Q = (U_{f} - U_{i}) + W \\ \Rightarrow - 30 = (U_{f} - 30) + (- 10) \\ \Rightarrow U_{f} = 10 J \end{array}$

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