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<div class="page">
<p class="pageHeading">Fysik</p>
<div class="section" id="measures-and-units">
<p class="sectionHeading">Mål og Enheder</p>
<table>
<tr>
<th>Mål</th>
<th>Symbol<sub> af mål</sub></th>
<th>Enhed</th>
<th>Symbol<sub> af enhed</sub></th>
</tr>
<tr class="small">
<th colspan="4">Mål<sub> med navngivede enheder</sub></th>
</tr>
<tr>
<td>energi</td>
<td class="math">\(E\)</td>
<td>joule</td>
<td class="math">\(J\)</td>
</tr>
<tr>
<td>kraft</td>
<td class="math">\(F\)</td>
<td>newton</td>
<td class="math">\(N\)</td>
</tr>
<tr>
<td>frekvens</td>
<td class="math">\(f\)</td>
<td>hertz</td>
<td class="math">\(Hz\)</td>
</tr>
<tr>
<td>strømstyrke</td>
<td class="math">\(I\)</td>
<td>ampere</td>
<td class="math">\(A\)</td>
</tr>
<tr>
<td>lysstyrke</td>
<td class="math">\(I_v\)</td>
<td>candela</td>
<td class="math">\(cd\)</td>
</tr>
<tr>
<td>masse</td>
<td class="math">\(m\)</td>
<td>kilogram</td>
<td class="math">\(kg\)</td>
</tr>
<tr>
<td>effekt</td>
<td class="math">\(P\)</td>
<td>watt</td>
<td class="math">\(W\)</td>
</tr>
<tr>
<td>tryk</td>
<td class="math">\(p\)</td>
<td>pascal</td>
<td class="math">\(Pa\)</td>
</tr>
<tr>
<td>ladning</td>
<td class="math">\(q\)</td>
<td>coulomb</td>
<td class="math">\(C\)</td>
</tr>
<tr>
<td>distance</td>
<td class="math">\(s\)</td>
<td>meter</td>
<td class="math">\(m\)</td>
</tr>
<tr>
<td>temperatur</td>
<td class="math">\(T\)</td>
<td>kelvin</td>
<td class="math">\(K\)</td>
</tr>
<tr>
<td>tid</td>
<td class="math">\(t\)</td>
<td>sekund</td>
<td class="math">\(s\)</td>
</tr>
<tr class="small">
<th colspan="4">Mål<sub> med unavngivede enheder</sub></th>
</tr>
<tr>
<td>areal</td>
<td class="math">\(A\)</td>
<td>kvadratmeter</td>
<td class="math">\(m^2\)</td>
</tr>
<tr>
<td>acceleration</td>
<td class="math">\(a\)</td>
<td>meter pr. kvadratsekund</td>
<td class="math">\(\frac {m}{s^2}\)</td>
</tr>
<tr>
<td>varmekapacitet</td>
<td class="math">\(C\)</td>
<td>joule pr. kelvin</td>
<td class="math">\(\frac {J}{K}\)</td>
</tr>
<tr>
<td>specifik varmekapacitet</td>
<td class="math">\(c\)</td>
<td>joule pr. kelvin-kilogram</td>
<td class="math">\(\frac {J}{K \cdot kg}\)</td>
</tr>
<tr>
<td>flux</td>
<td class="math">\(i\)</td>
<td>watt pr. kvadratmeter</td>
<td class="math">\(\frac {W}{m^2}\)</td>
</tr>
<tr>
<td>volumen</td>
<td class="math">\(V\)</td>
<td>kubikmeter</td>
<td class="math">\(m^3\)</td>
</tr>
<tr>
<td>hastighed</td>
<td class="math">\(v\)</td>
<td>meter pr. sekund</td>
<td class="math">\(\frac {m}{s}\)</td>
</tr>
<tr>
<td>densitet</td>
<td class="math">\(\rho\)</td>
<td>kilogram pr. kubikmeter</td>
<td class="math">\(\frac {kg}{m^3}\)</td>
</tr>
<tr class="small">
<th colspan="4">Mål<sub> uden enheder</sub></th>
</tr>
<tr>
<td>strålingsfaktor</td>
<td class="math">\(\varepsilon\)</td>
</tr>
</table>
<p>Mål med variante enheder:</p>
<table>
<tr>
<th>Mål</th>
<th>Enheder</th>
<th>Symboler<sub> af enheder</sub></th>
</tr>
<tr>
<td>temperatur</td>
<td>grader celsius</td>
<td class="math">\({}^{\circ}C\)</td>
</tr>
<tr>
<td>hastighed</td>
<td>kilometer pr. time</td>
<td class="math">\(\frac {km}{h}\)</td>
</tr>
</table>
<p>Variante mål:</p>
<table>
<tr>
<th>Mål</th>
<th>Symbol</th>
<th>Afledt af</th>
</tr>
<tr>
<td>tyngdeacceleration</td>
<td class="math">\(g\)</td>
<td>acceleration</td>
</tr>
<tr>
<td>kinetisk energi</td>
<td class="math">\(K\)</td>
<td rowspan="4">energi</td>
</tr>
<tr>
<td>potentiel energi</td>
<td class="math">\(U\)</td>
</tr>
<tr>
<td>varmeenergi</td>
<td class="math">\(Q\)</td>
</tr>
<tr>
<td>arbejde</td>
<td class="math">\(W\)</td>
</tr>
<tr>
<td>bølgelængde</td>
<td class="math">\(\lambda\)</td>
<td>distance</td>
</tr>
</table>
<p>Afledte enheder:</p>
<p class="math">\(1\ C=1\ A \cdot 1\ s\)</p>
<p class="math">\(1\ Hz=1\ s^{-1}\)</p>
<p class="math">\(1\ J=1\ \frac {kg \cdot m^2}{s^2}\)</p>
<p class="math">\(1\ N=1\ \frac {kg \cdot m}{s^2}\)</p>
<p class="math">\(1\ Pa=1\ \frac {kg}{ms^2}\)</p>
<p class="math">\(1\ W=1\ \frac Js\)</p>
<br />
<p>Variante enheder:</p>
<p class="math">\(1\ {}^{\circ}C=\frac {5463}{20}\ K\)</p>
<p class="math">\(1\ \frac {km}h=\frac 5{18}\ \frac ms\)</p>
</div>
<div class="section" id="electrodynamics">
<p class="sectionHeading">Elektrodynamik</p>
<p class="math">\(I=\frac qt\)</p>
<br />
<p class="math">\(i=\frac PA\)</p>
<p class="math">\(i=T^4{\sigma}{\varepsilon}\)</p>
<p>... afgives ved stråling.</p>
<br />
<p class="math">\(P=iA\)</p>
<br />
<p class="math">\(q=It\)</p>
<br />
<p class="math">\(T=\sqrt[4] {\frac i{{\sigma}{\varepsilon}}}\)</p>
<p>... ved overfladen af det strålende objekt.</p>
<br />
<p class="math">\(\lambda=\frac {v}{f}\)</p>
</div>
<div class="section" id="mechanics">
<p class="sectionHeading">Mekanik</p>
<p class="math">\(a=\frac Fm\)</p>
<p class="math">\(a=\frac vt\)</p>
<p class="math">\(g=\frac {Gm}{r^{2}}\)</p>
<p>... hvori <i>r</i> er distancen til planetens kerne.</p>
<p class="math">\(g_♁=\frac {981}{10^2}\ \frac {m}{s^2}\)</p>
<p>... er standard på Jorden.</p>
<br />
<p class="math">\(E=Pt\)</p>
<p class="math">\(K=\frac {mv^2}2\)</p>
<p class="math">\(U=Fs\)</p>
<p>... hvori <i>F</i> er tyngdekraften og <i>g</i> er den lokale tyngeacceleration.</p>
<p class="math">\(W=Fs\)</p>
<br />
<p class="math">\(F=\frac Es\)</p>
<p class="math">\(F=\frac {Gm_{0}m_{1}}{r^{2}}\)</p>
<p>... hvori <span class="math">\(m_0\)</span> og <span class="math">\(m_1\)</span> er masserne af objekterne og <span class="math">\(r\)</span> er distancen mellem centrene af de to objekter.</p>
<br />
<p class="math">\(P=\frac Et\)</p>
<br />
<p class="math">\(p=\frac FA\)</p>
<br />
<p class="math">\(\rho=\frac mV\)</p>
</div>
<div class="section" id="thermodynamics">
<p class="sectionHeading">Termodynamik</p>
<p class="math">\(C=Cm\)</p>
<br />
<p class="math">\(c=\frac Cm\)</p>
<br />
<p class="math">\(Q=CT\)</p>
</div>
<div class="section" id="constants">
<p class="sectionHeading">Konstanter</p>
<p class="subHeading">Jf. <a href="/html/topic/mathematics.html#constants">matematikkens konstanter</a>.</p>
<table>
<tr>
<th>Navn</th>
<th>Symbol</th>
</tr>
<tr>
<td>lysets hastighed i et vakuum</td>
<td class="math">\(c\)</td>
</tr>
<tr>
<td>elementærladningen</td>
<td class="math">\(e\)</td>
</tr>
<tr>
<td>gravitationskonstanten</td>
<td class="math">\(G\)</td>
</tr>
<tr>
<td>Plancks konstant</td>
<td class="math">\(h\)</td>
</tr>
<tr>
<td>Boltzmanns konstant</td>
<td class="math">\(k_B\)</td>
</tr>
<tr>
<td>Stefan-Boltzmann konstanten</td>
<td class="math">\(\sigma\)</td>
</tr>
</table>
<p class="math">\(c=299\ 792\ 458\ \frac {m}{s}\)</p>
<p class="math">\(e=\frac {1\ 602\ 176\ 634}{10^{28}}\ C\)</p>
<p class="math">\(G \approx \frac {66\ 743}{10^{15}}\ \frac {m^3}{kg \cdot s^2}\)</p>
<p class="math">\(h=\frac {662\ 607\ 015}{10^{42}}\ \frac {J}{Hz}\)</p>
<p class="math">\(k_B=\frac {1\ 380\ 649}{10^{29}}\ \frac {J}{K}\)</p>
<p class="math">\(\sigma=\frac {2\pi^5k_B^4}{15h^3c^2} \approx \frac {5\ 670\ 374\ 419}{10^{17}}\ \frac {W}{m^2K^4}\)</p>
</div>
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