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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
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<title>CAPQ</title>
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<div class="jumbotron titlebar">
<h2 class="text-center">the handy booklet of</h2>
<h1 class="text-center">Constantly Asked Physics Questions</h1>
</div>
<div class="container">
<div class="col-md-8 col-xs-12 introduction">
<!--<div class="version">
commit a9f752e685967adcb11bc65b92f881344309d901
Author: Riccardo Antonelli <[email protected]>
Date: Mon Nov 16 12:37:31 2015 +0100
</div>--!>
<p>Everyone gets bored of always answering the same questions over and over again. It's normal. Especially if it's Physics. That's why we have FAQs. But next to the <em>always</em> asked questions, there are also the <em>often</em> asked, those who just can not make it to big FAQs but really are popular enough to annoy the answerer, helplessly scrolling for new adventures in a sea of déjà-vus.</p>
<p>This is not a definitive FAQ, nor is it necessarily a good FAQ, it's just my FAQ. It's shamelessly skewed towards my view of the physical world. It is also very inconsistent in the level requested of the reader. Typically, I'd just assume the minimal background needed for the answer to be a pleasurable conversation, neither a patronizing poem nor a bored review.</p>
<p>You can contribute if you want! Check the <a href="https://github.com/rantonels/capq">README at the Github project page</a> or just <a href="https://reddit.com/u/rantonels">hit me up on Reddit</a>.</p>
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<div class="col-md-4 col-xs-12 downloadpanel">
<h3><i class="fa fa-arrow-down"></i> Download .pdf</h3>
<p>You can find a printable, up-to-date .pdf version of the CAPQ <a href="tex/capq-booklet.pdf">here</a>. (This .pdf is a work in progress and content might be scrambled, missing, or badly laid out.)<p>
</div>
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<a href="https://github.com/rantonels/capq"><i class="fa fa-github-alt"></i></a>
<a href="https://www.reddit.com/r/AskPhysics/comments/3c0feo/meta_im_making_a_physics_faq/"><i class="fa fa-reddit"></i></a>
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<div class="col-md-12 col-xs-12 toc">
<hr>
<h2 id="kinematicsgeneral-physics">Kinematics/General Physics</h2>
<p><a href="q/KGP1.html">KGP1 - Why is <span class="math">\(c\)</span>/<span class="math">\(\hbar\)</span>/<span class="math">\(k_B\)</span>/(other fundamental constant) the value it is? What would happen if it was different?</a></p>
<h2 id="classical-mechanics">Classical Mechanics</h2>
<p><a href="q/CM1.html">CM1 - Why is my physics teacher so anal about centripetal vs centrifugal? Is the centrifugal force "fictitious"?</a></p>
<p><a href="q/CM2.html">CM2 - What would happen if you were struck by a primordial (<span class="math">\(10^{14} \; \mathrm{kg}\)</span>) black hole at orbital speed (<span class="math">\(8 \, \mathrm{km}/\mathrm{s}\)</span>)?</a></p>
<h2 id="thermodynamics">Thermodynamics</h2>
<p><a href="q/TD1.html">TD1 - How are negative temperature possible? Why are they hotter than any positive temperature? How were they acheived?</a></p>
<h2 id="celestialorbital-mechanics">Celestial/Orbital Mechanics</h2>
<p><a href="q/OM1.html">OM1 - How do gravity assists/slingshots work?</a></p>
<p><a href="q/OM2.html">OM2 - Why won't/didn't New Horizons stop at Pluto and instead had to fly by?</a></p>
<h2 id="fluid-mechanics">Fluid Mechanics</h2>
<h2 id="classical-electrodynamics">Classical Electrodynamics</h2>
<p><a href="q/CED1.html">CED1 - What is the Maxwell stress tensor <span class="math">\(\mathbf{\sigma}\)</span> and how does it work?</a></p>
<p><a href="q/CED2.html">CED2 - Why is current produced to a wire when moving a magnet close to it?</a></p>
<h2 id="analytical-mechanics">Analytical Mechanics</h2>
<p><a href="q/AM1.html">AM1 - Why are <span class="math">\(q(t)\)</span> and <span class="math">\(\dot q(t)\)</span> treated as indipendent in Lagrangian mechanics? Shouldn't <span class="math">\(\dot q(t)\)</span> be viewed as a function(al) of <span class="math">\(q(t)\)</span>?</a></p>
<h2 id="special-relativity">Special Relativity</h2>
<p><a href="q/SR1.html">SR1 - In what sense does <span class="math">\(E=mc^2\)</span>, and what does it mean?</a></p>
<p><a href="q/SR2.html">SR2 - if photons are massless, how can <span class="math">\(E=mc^2\)</span>?</a></p>
<h2 id="general-relativity">General Relativity</h2>
<p><a href="q/GR1.html">GR1 - How long does a year on Mercury last from Mercury's point of view?</a></p>
<h2 id="general-quantum-field-theorymany-bodyrelativistic-qm">General Quantum Field Theory/Many Body/Relativistic QM</h2>
<p><a href="q/QFT1.html">QFT1 - What is "imaginary time"? And what is meant by "Euclidean spacetime"?</a></p>
<h2 id="nuclear-physics">Nuclear Physics</h2>
<h2 id="quantum-electrodynamics">Quantum Electrodynamics</h2>
<p><a href="q/QED1.html">QED1 - How does <span class="math">\(1+2+3+\ldots=-1/12\)</span>/<span class="math">\(\zeta\)</span>-regularization enter in the Casimir effect?</a></p>
<h2 id="particle-physicshigh-energy-physics">Particle Physics/High Energy Physics</h2>
<p><a href="q/HEP1.html">HEP1 - Why are photons massless?</a></p>
<p><a href="q/HEP2.html">HEP2 - Why do photons not acquire a mass through the Higgs mechanism?</a></p>
<p><a href="q/HEP3.html">HEP3 - Why do photons not acquire a mass through quantum corrections/interaction with virtual particles? What is charge renormalization?</a></p>
<p><a href="q/HEP4.html">HEP4 - Is the electron a point particle, or an extended object? How sure are we of that?</a></p>
<h2 id="quantum-gravitystring-theory">Quantum Gravity/String Theory</h2>
<p><a href="q/QG1.html">QG1 - If the Planck length/Planck time is the smallest measurable/possible length/time, then...?</a></p>
<p><a href="q/QG2.html">QG2 - since the electron is a point mass, is it a black hole?</a></p>
<h2 id="list-of-well-known-crackpots">List of well-known crackpots</h2>
<p><a href="q/Aether.html">Aether Wave Theory / Zephir</a></p>
<p><a href="q/Imagining.html">Imagining the Tenth Dimension / Rob Bryanton</a></p>
<p><a href="q/Standup.html">The Stand-Up Physicists / Doug Sweetser</a></p>
<p><a href="q/Nassim.html">Nassim Haramein / Resonance Project / Schwarzschild proton / Haramein-Rauscher metric</a></p>
<p><a href="q/Lisi.html">An exceptionally simple theory of everything / <span class="math">\(E_8\)</span> Theory / Garret Lisi</a></p>
<p><a href="q/EMdrive.html">EM drive / Roger Shawyer / NASA "warp" drive</a></p>
</div>
</div>
</body>
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