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[The word energy is a technical term invented by Thomas Young (1773–1829) in 1807. Its origin is the Greek word ένεργεια which means efficacy or effective force. Young used it as a convenient abbreviation for the sum of kinetic energy and gravitational potential energy of a mass and the elastic energy of a spring to which the mass may be attached. That sum is conserved by Newton’s laws and Hooke’s law of elasticity, although the individual contributions might change.1 The term energy was not fully accepted until the second half of the 19th century when it was extrapolated away from mechanics to include the internal energy of thermodynamics and the electro-magnetic energy. The first law of thermodynamics states that the total sum is conserved: the sum of mechanical, thermodynamic, electromagnetic, and nuclear energies. We shall proceed to describe the difficult birth of that idea.]
Published: Jan 1, 2007
Keywords: Lorentz Transformation; Ether Relation; Gravitational Potential Energy; Mass Defect; Absolute Space
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