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</select> </div> </div> <div class="col s3"> <div class="wrap-drop-option"> <span class="title-drop">Popular</span> <select class="select filter-select" data-sort-type="popular"> <option data-display="Select"></option> <option value="1d">Last day</option> <option value="1w">1 week</option> <option value="1m">1 month</option> <option value="all">All</option> </select> </div> </div> </div> </div> </div> </div> </div> <div class="news-title page-title container"><h1>News tagged with <em>energy</em></h1></div> <div class="container"> <div class="cut-content"> <h5>Energy</h5> <p>In physics, <b>energy</b> (from the Greek ἐνέργεια - <i>energeia</i>, "activity, operation", from ἐνεργός - <i>energos</i>, "active, working") is a scalar physical quantity that describes the amount of work that can be performed by a force, an attribute of objects and systems that is subject to a conservation law. Different forms of energy include kinetic, potential, thermal, gravitational, sound, light, elastic, and electromagnetic energy. The forms of energy are often named after a related force.</p><p>Any form of energy can be transformed into another form, but the total energy always remains the same. This principle, the conservation of energy, was first postulated in the early 19th century, and applies to any isolated system. According to Noether's theorem, the conservation of energy is a consequence of the fact that the laws of physics do not change over time.</p><p>Although the total energy of a system does not change with time, its value may depend on the frame of reference. For example, a seated passenger in a moving airplane has zero kinetic energy relative to the airplane, but non-zero kinetic energy relative to the Earth.</p> <p><small> This text uses material from <a href="https://web.archive.org/web/20201120104058/http://en.wikipedia.org/Energy">Wikipedia</a>, licensed under <a href="https://web.archive.org/web/20201120104058/http://creativecommons.org/licenses/by-sa/3.0/">CC BY-SA</a> </small></p> </div> </div> <div class="container"> Related topics: <a href="https://web.archive.org/web/20201120104058/https://phys.org/tags/electricity/">electricity</a> · <a href="https://web.archive.org/web/20201120104058/https://phys.org/tags/energy+consumption/">energy consumption</a> · <a href="https://web.archive.org/web/20201120104058/https://phys.org/tags/renewable+energy/">renewable energy</a> · <a href="https://web.archive.org/web/20201120104058/https://phys.org/tags/energy+efficiency/">energy efficiency</a> · <a 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neutron drip line is related to deformation</a></h2> <div class="card-content-footer"> <div class="date"> <i class="icon-clock greycolor"></i> <span>Nov 05, 2020</span> </div> <div class="badge-wrapper"> <span class=" badge blue-white badge-a_report">report</span> </div> </div> </div> </div> </div> </div> </div> </section> <div class="container ads-container"> <script async src="//web.archive.org/web/20201120104058js_/https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script> <ins class="adsbygoogle" style="display:block" data-ad-format="fluid" data-ad-layout="image-side" data-ad-client="ca-pub-0536483524803400" data-ad-slot="7349695930"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div> </section> <div class="load-more-indicator"><i class="icon-spin3 animate-spin"></i> Load more</div> <ul class="sidenav collapsible collapsible-accordion" id="mobile-sidenav-menu"> <li> <a class="collapsible-header waves-effect waves-blue" href="#"><i 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