? asked in Science & MathematicsPhysics · 2 years ago

What can you say about the relative magnitudes of W and Q?

Compressing air to fill a scuba tank warms it up. A dive shop compensates by putting the tank in a tub of water, keeping the tank and the gas inside it at a constant temperature as it is filled.

W>0 and Q<0

What can you say about the relative magnitudes of W and Q?

a. |W|>|Q|

b. |W|=|Q|

c. |W|<|Q|

2 Answers

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  • 2 years ago
    Favorite Answer

    Answer b).

    Since the temperature is constant and there is no state-change, there is no change in the air's internal energy (U).

    That means the amount of work done compressing the gas, |W|, must equal the amount of heat removed, |Q|.

    (If b) were not true, the difference between |W| and |Q| would be the change in internal energy; but if the internal energy changed, the temperature coudn't be constant.)

  • 2 years ago

    what is W and Q?

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