Which illustrates the first law of thermodynamics?

a) a bicycle pump gets warm when used.

b) stoves radiate energy into a room.

c) absolute zero cannot be reached.

d) a refrigerator makes objects colder.

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Among the choices the one that illustrates the first law of thermodynamics is A bicycle pump gets warm when used. which is A. 

A thermodynamics the branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.

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