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OpenStudy (anonymous):

The engine of a car left running for a long period of time becomes hot because _________.

OpenStudy (aaronq):

because the engine's parts are moving and rubbing up against each other (friction)

OpenStudy (aaronq):

pistons, etc

OpenStudy (anonymous):

Well the answer is supposed to have to do with energy or something like that

OpenStudy (aaronq):

the force (friction) between 2 objects converts kinetic energy into heat

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