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Posted by on Wednesday, January 5, 2011 at 6:57pm.

When energy changes forms, the total amount of energy is conserved. However, the amount of useful energy is
almost always less than the total amount of energy. Explain the energy conversions and unwanted energy that might be produced by the hinges of a squeaky door.

  • Science - , Wednesday, January 5, 2011 at 6:59pm

    mechanical to sound and frictional heat generation

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