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#physicsquestion

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Leandro (Cerberus1746)<p>hello, I have a couple questions about <a href="https://mastodon.gamedev.place/tags/physics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>physics</span></a> more precisely <a href="https://mastodon.gamedev.place/tags/relativity" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>relativity</span></a> </p><p>How do I actually use <a href="https://mastodon.gamedev.place/tags/metric" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>metric</span></a> <a href="https://mastodon.gamedev.place/tags/tensors" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>tensors</span></a>? Do I just do a dot product over the elements with a vector? If a metric tensor has a variable inside, does that variable comes from the vector and I just replace it? After I replace the vector and do the equation, only then I do the dot product?</p><p>If I want to have the inverse of a metric tensor, do I just do a <a href="https://mastodon.gamedev.place/tags/matrix" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>matrix</span></a> inversion?</p><p><a href="https://mastodon.gamedev.place/tags/physicsquestion" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>physicsquestion</span></a> <a href="https://mastodon.gamedev.place/tags/pleaseboost" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pleaseboost</span></a> <a href="https://mastodon.gamedev.place/tags/pleaseboostme" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pleaseboostme</span></a></p>
zvavybir :palestina:🍉 :FediPact: :Green: :masked:<p>Question: What is the derivative of the Lagrangian (of what system I don't particularly care right now) with respect to entropy (or to the time derivative of entropy)? Is this even a sensible question? Can we use the Euler-Lagrange equation for entropy?</p><p><a href="https://social.zvavybir.eu/tags/lagrangian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>lagrangian</span></a> <a href="https://social.zvavybir.eu/tags/lagrangianMechanics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>lagrangianMechanics</span></a> <a href="https://social.zvavybir.eu/tags/physics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>physics</span></a> <a href="https://social.zvavybir.eu/tags/physicsQuestion" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>physicsQuestion</span></a> <a href="https://social.zvavybir.eu/tags/entropy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>entropy</span></a> <a href="https://social.zvavybir.eu/tags/eulerLagrangeEquation" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>eulerLagrangeEquation</span></a> <a href="https://social.zvavybir.eu/tags/eulerLagrangeEquations" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>eulerLagrangeEquations</span></a></p>
Steven<p>Turns out infrared thermometers don't get the temperature of water right.<br>Alerted to this when dying a shirt.<br>IR thermometer said 85°C - while I wondered why the water was gently bubbling.<br>Digging out a mercury thermometer revealed why - it was at simmering at 100°C.</p><p>The shirt still seems to have dyed okay.</p><p>Any physicist care to explain?<br><a href="https://fosstodon.org/tags/PhysicsMastodon" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PhysicsMastodon</span></a><br><a href="https://fosstodon.org/tags/PhysicsQuestion" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PhysicsQuestion</span></a><br><a href="https://fosstodon.org/tags/IRThermometer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IRThermometer</span></a><br><a href="https://fosstodon.org/tags/TheNeedForPurple" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TheNeedForPurple</span></a></p>
George Musser<p>Physics friends: When you fill a water bottle from a tap quickly, there’s an audible frequency sweep (to higher frequencies). Why? Can you write an equation for it? <a href="https://mastodon.social/tags/physics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>physics</span></a> <a href="https://mastodon.social/tags/PhysicsQuestion" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PhysicsQuestion</span></a></p>
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