Apiston-cylinder assembly contains 2 lb of air at a temperature of 540 degrees r and a pressure of 1 atm. the air is compressed to a state where the temperature is 840 degrees r and the pressure is 6 atm. during the compression there is a heat transfer from the air to the surroundings equal to 20 btu. determine the work during the process, in btu. state your assumptions, if any.

Explanation:

Hello,

In this problem, the piston-cylinder assembly make us state the energy balance as:

Thus, we must now compute in terms of Cv as follows:

Now, since heat is given off, its sign is negative, thus, the work is computed as:

This work means that work was done over the system in order to allow the compression.

The suppositions were:

- The change in the internal energy is a function of the temperature.

- Air is an ideal gas.

Best regards.

answer:

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