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For many years inventors tried to develop a perpetual motion machine, one that would continue moving forever once it was set in motion. They were never successful because A. all machines are closed
systems. B. they could never make a perfectly silent machine. C. friction between moving parts would transform the kinetic energy to heat. D. kinetic energy would be transformed to potential energy in such a machine.
C. friction between moving parts would transform the kinetic energy to heat.
Expert answered|KennLJ|Points 192|
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Asked 7/26/2011 12:32:56 PM
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