In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas releases $20 J$ of heat and $8 J$ of work is done on the gas. If initial internal energy of the gas was $30 J$ , what will be the final internal energy?

42 J

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12 J

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10 J

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18 J

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Solution

The correct option is D $18 J$
Heat energy added $=$ change in internal energy $+$ work done
$20 = (30 - U) + 8$
$30 - U = 12$
$U = 18 J$

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In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20 J of heat and 8 J of work is done on the gas. If initial internal energy of the gas was 30 J, what will be the final internal energy?

The correct option is D 18 JHeat energy added=change in internal energy+work done20=(30−U)+830−U=12U=18 J

In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas releases $20 J$ of heat and $8 J$ of work is done on the gas. If initial internal energy of the gas was $30 J$ , what will be the final internal energy?

The correct option is D $18 J$
Heat energy added $=$ change in internal energy $+$ work done
$20 = (30 - U) + 8$
$30 - U = 12$
$U = 18 J$