Lake Sinclair Topics: Perpetual Motion;

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	Name:	dmp -
	Subject:	Perpetual Motion;
	Date:	5/6/2008 4:57:47 PM

Actually a wave can only last for a certain time before the energy is dissapated by forces at the molecular level of the media and losses of energy in transmission. Sound waves are an excellent example of this -- sound energy (like waves in water) is dissapated at an exponential rate as you get farther from the source.