ximran96 ximran96

09-02-2017
Physics

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“Suppose you throw a football upward. Is it true or wrong to say that you have not increased the internal energy of the air within the football?”

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MissPhiladelphia MissPhiladelphia

10-02-2017

It is wrong to say that the internal energy of the air inside a football when you kick it has not increased. The internal energy of a closed system is the difference between the heat added to the system and the work done by the system. Since the work is done on the system, the internal energy will increase.

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