I don't understand how to get the second part of the question: If I use the equation delta U = W + Q and use -4 as U from the first part of the question, I get -4 = W + (-10).

Why would 4/U be posetive as the answer below suggests?

$An amount of air can be expanded between two states as it does $ 21 \mathrm{~kJ} $ of work and $ 17 \mathrm{~kJ} $ of hea$

Question

I don't understand how to get the second part of the question: If I use the equation delta U = W + Q and use -4 as U from the first part of the question, I get -4 = W + (-10).

Why would 4/U be posetive as the answer below suggests?

$An amount of air can be expanded between two states as it does $ 21 \mathrm{~kJ} $ of work and $ 17 \mathrm{~kJ} $ of hea$

An amount of air can be expanded between two states as it does

21 kJ

of work and

17 kJ

of heating is done on it. A second kind of expansion can be found between the same initial and final states which requires heating to the air of only

10 kJ

. What is the increase in internal energy in the first expansion and what is the work done by the air in the second?

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