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The first law of thermodynamics is the law of conservation of energy. It states that energy is always conserved. ... To keep a machine moving, the energy applied should stay with the machine without any losses. Because of this fact alone, it is impossible to build perpetual motion machines.
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Explanation:

according to the first law of thermodynamics, the energy is always conserved. To keep a machine moving, the energy applied should stay with the machine without any losses. Because of this, first law of thermodynamics states it as impossible to build perpetual motion machines.

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