In thermodynamics process pressure of a fixed mass of gas is changed in such a manner that the gas releases $30 J$ of heat and $18 J$ of work was done on the gas. If the initial energy of the gas was $60 J$ then, the final internal energy will be:

32 J

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48 J

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72 J

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96 J

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Solution

The correct option is C $48 J$
The change in the internal energy of the system, U = Q - W
Q = -30
W = -18
Hence, $U = - 12$
Thus, if the initial internal energy is $60 J$ ,
the final energy x is given by,
$x - 60 = - 12$
or, $x = 48 J$

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In thermodynamics process pressure of a fixed mass of gas is changed in such a manner that the gas releases 30 J of heat and 18 J of work was done on the gas. If the initial energy of the gas was 60 J then, the final internal energy will be:

The correct option is C 48 JThe change in the internal energy of the system, U = Q - WQ = -30 W = -18Hence, U=−12Thus, if the initial internal energy is 60 J, the final energy x is given by, x−60=−12 or, x=48 J

In thermodynamics process pressure of a fixed mass of gas is changed in such a manner that the gas releases $30 J$ of heat and $18 J$ of work was done on the gas. If the initial energy of the gas was $60 J$ then, the final internal energy will be:

The correct option is C $48 J$
The change in the internal energy of the system, U = Q - W
Q = -30
W = -18
Hence, $U = - 12$
Thus, if the initial internal energy is $60 J$ ,
the final energy x is given by,
$x - 60 = - 12$
or, $x = 48 J$