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The Age of Reason is left the Dark Ages of the history of mechanics. Clifford A. Truesdell) 1. 1 THE INVISIBLE TRUTH OF CLASSICAL PHYSICS There are some questions that physics since the days of Newton simply cannot an­ swer. Perhaps the most important of these can be categorized as 'questions of eth­ ics', and 'questions of ultimate meaning'. The question of humanity's place in the cosmos and in nature is pre-eminently a philosophical and religious one, and physics seems to have little to contribute to answering it. Although physics claims to have made very fundamental discoveries about the cosmos and nature, its concern is with the coherence and order of material phenomena rather than with questions of mean­ ing. Now and then thinkers such as Stephen Hawking or Fritjof Capra emerge, who appear to claim that a total world-view can be derived from physics. Generally, however, such authors do not actually make any great effort to make good on their claim to completeness: their answers to questions of meaning often pale in compari­ 2 son with their answers to conventional questions in physics. Moreover, to the extent that they do attempt to answer questions of meaning, it is easy to show that they 3 draw on assumptions from outside physics.

Conservation de l'énergie --- Conservation of energy --- Correlation of forces --- Force and energy --- Force et énergie --- Kracht en energie --- Mechanica --- Mechanics --- Mécanique --- Énergie --- Énergétique --- Force and energy. --- Mechanics. --- Physics --- Philosophy. --- Philosophy --- Classical mechanics --- Newtonian mechanics --- Dynamics --- Quantum theory --- Energy --- Philosophy and science. --- Physics. --- History. --- Philosophy of Science. --- History and Philosophical Foundations of Physics. --- Classical Mechanics. --- History, general. --- Annals --- Auxiliary sciences of history --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Science and philosophy --- Science --- Physics - Philosophy