PhysicsLAB AP Free Response Question
2013 B5

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In a certain process, 3200 J of energy is added to an ideal gas by heating. During the same process, 2100 J of work is done on the gas.
 
 (a) Determine the change in the internal energy of the gas.

(b) Indicate whether each of the following properties of the gas increases, decreases, or remains the same during the process.
 
 
i. Volume. Justify your choice.
 
____ Increases
____ Decreases
____ Remains the same

 
ii. Temperature. Justify your choice.
 
____ Increases
____ Decreases
____ Remains the same

 
iii. Pressure.  Justify your choice.
 
____ Increases
____ Decreases
____ Remains the same

Suppose that in a different process 1800 joules of work is done on the ideal gas at a constant temperature.
 
 (c) Determine the change in internal energy of the gas during the process.

 
(d) Which of the following correctly describes the energy transfer by heating, if any, between the gas and its surroundings? Justify your answer.
 
____ Energy is transferred into the gas.
____ Energy is transferred out of the gas.
____ There is no energy transfer by heating.




 
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