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OpenStudy (anonymous):
The engine of a car left running for a long period of time becomes hot because _________.
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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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