<h2>Constants in Equations</h2>
<p>A constant in an equation <strong>always</strong> has the same value. For example the speed of light ($c=\text{2.99} \times \text{10}^{\text{8}}\text{ m·s$^{-1}$}$, Planck's constant ($h$) and Avogadro's number (${N}_{A}$) are all examples of constants that are used in science. The following table lists some of the constants you will encounter.</p>
<div>
<table>
<tbody>
<tr>
<td>
<h3><strong>Constant</strong></h3>
</td>
<td>
<h3><strong>Symbol</strong></h3>
</td>
<td>
<h3><strong>Value and Units</strong></h3>
</td>
<td>
<h3><strong>SI Units</strong></h3>
</td>
</tr>
<tr>
<td>
<p>Atomic mass unit</p>
</td>
<td>
<p>u</p>
</td>
<td>
<p>$\text{1.67} \times \text{10}^{-\text{24}}$ $\text{g}$</p>
</td>
<td>
<p>$\text{1.67} \times \text{10}^{-\text{27}}$ $\text{kg}$</p>
</td>
</tr>
<tr>
<td>
<p>Charge on an electron</p>
</td>
<td>
<p>e</p>
</td>
<td>
<p>$-\text{1.6} \times \text{10}^{-\text{19}}$ $\text{C}$</p>
</td>
<td>
<p>$-\text{1.6} \times \text{10}^{-\text{19}}$ $\text{s·A}$</p>
</td>
</tr>
<tr>
<td>
<p>Speed of sound (in air, at $\text{25}$ $\text{℃}$)</p>
</td>
<td> </td>
<td colspan="2">
<p>$\text{344}$ $\text{m·s$^{-1}$}$</p>
</td>
</tr>
<tr>
<td>
<p>Speed of light</p>
</td>
<td>
<p>c</p>
</td>
<td colspan="2">
<p>$\text{3} \times \text{10}^{\text{8}}$ $\text{m·s$^{-1}$}$</p>
</td>
</tr>
<tr>
<td>
<p>Planck's constant</p>
</td>
<td>
<p>h</p>
</td>
<td>
<p>$\text{6.626} \times \text{10}^{-\text{34}}$ $\text{J}$</p>
</td>
<td>
<p>$\text{6.626} \times \text{10}^{-\text{34}}$ $\text{kg·m$^{2}$·s$^{-1}$}$</p>
</td>
</tr>
<tr>
<td>
<p>Avogadro's number</p>
</td>
<td>
<p>${N}_{A}$</p>
</td>
<td colspan="2">
<p>$\text{6.022} \times \text{10}^{\text{23}}$</p>
</td>
</tr>
<tr>
<td>
<p>Gravitational acceleration</p>
</td>
<td>
<p>g</p>
</td>
<td colspan="2">
<p>$\text{9.8}$ $\text{m·s$^{-1}$}$</p>
</td>
</tr>
</tbody>
</table>
<h2>Trigonometry</h2>
<p>Trigonometry is the relationship between the angles and sides of right angled triangles. Trigonometrical relationships are ratios and therefore have no units. You should know the following trigonometric ratios:</p>
<p><a href="https://data.ulearngo.com/assets/5162ba1c-1ed1-4f07-9869-510c1494c41d"><img alt="" class="size-full wp-image-102621 alignnone" height="234" src="https://data.ulearngo.com/assets/5162ba1c-1ed1-4f07-9869-510c1494c41d" width="234"/></a></p>
<h3>Sine</h3>
<p>This is defined as $\sin A = \frac{\text{opposite}}{\text{hypotenuse}}$</p>
<h3>Cosine</h3>
<p>This is defined as $\cos A = \frac{\text{adjacent}}{\text{hypotenuse}}$</p>
<h3>Tangent</h3>
<p>This is defined as $\tan A = \frac{\text{opposite}}{\text{adjacent}}$</p>
</div>
<section></section>

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Constants and Trigonometry

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Constants and Trigonometry

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