PHYSICS NOTE

Jun 17th, 2015
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Relate the release of energy in a nuclear reaction with a change of mass according to the equation E = mc2 - • Both nuclear fission and fusion release a large amount of energy. The source of this energy is from the loss of mass in nuclear reactions. • The sum of the masses of the particles before the reaction is more than the sum of the masses of the

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PhysicsVarious examples of physical phenomena.Physics(fromAncientGreek: ()phusik (epistm)knowledge of nature, fromphsis"nature"[1][2][3]) is thenatural sciencethat involves the study ofmatter[4]and itsmotionthroughspace and time, along with related concepts such asenergyandforce.[5]More broadly, it is the general analysis ofnature, conducted in order to understand how theuniversebehaves.[a][6][7]Physics is one of the oldestacademic disciplines, perhaps the oldest through its inclusion ofastronomy.[8]Over the last two millennia, physics was a part ofnatural philosophyalong withchemistry, certain branches ofmathematics, andbiology, but during theScientific Revolutionin the 17th century, thenatural sciencesemerged as uniqueresearchprograms in their own right.[b]Physics intersects with manyinterdisciplinaryareas of research, such asbiophysicsandquantum chemistry, and the boundaries of physics are notrigidly defined. New ideas in physics often explain the fundamental mechanisms of other sciences[6]while opening new avenues of research in areas such asmathematicsandphilosophy.Physics also makes significant contributions through advances in newtechnologiesthat arise from theoretical breakthroughs. For example, advances in the understanding ofelectromagnetismornuclear physicsled directly to the development of new products

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