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what does "7.5J" refer to?
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<blockquote data-quote="astroboy" data-source="post: 621596" data-attributes="member: 4527"><p>"<strong>Radius</strong>" is represented by "<strong>r</strong>" lar!</p><p></p><p><em><a href="http://en.wikipedia.org/wiki/Circle" target="_blank">http://en.wikipedia.org/wiki/Circle</a></em></p><p><em>As proved by Archimedes, the area enclosed by a circle is equal to that of a triangle whose base has the length of the circle's circumference and whose height equals the circle's radius,[3] which comes to π multiplied by the radius squared:</em></p><p><img src="http://upload.wikimedia.org/wikipedia/en/math/0/1/f/01fcc4892814dea3c4385c7b9187db0c.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>"<strong>J</strong>" however stands for "<strong>Joule</strong>"</p><p><em></em></p><p><em><a href="http://en.wikipedia.org/wiki/Joule" target="_blank">http://en.wikipedia.org/wiki/Joule</a></em></p><p><em>The <strong>joule</strong> ( /ˈdʒuːl/ or sometimes /ˈdʒaʊl/); symbol <strong>J</strong>) is <u>a derived unit of energy, work, or amount of heat</u> in the International System of Units. It is equal to the energy expended (or work done) in applying a force of one newton through a distance of one meter (1 newton metre or N·m), or in passing an electric current of one ampere through a resistance of one ohm for one second.</em></p><p></p><p>... and it's totally irrelevant in this context. :thefinger:</p></blockquote><p></p>
[QUOTE="astroboy, post: 621596, member: 4527"] "[B]Radius[/B]" is represented by "[B]r[/B]" lar! [I][url]http://en.wikipedia.org/wiki/Circle[/url] As proved by Archimedes, the area enclosed by a circle is equal to that of a triangle whose base has the length of the circle's circumference and whose height equals the circle's radius,[3] which comes to π multiplied by the radius squared:[/I] [img]http://upload.wikimedia.org/wikipedia/en/math/0/1/f/01fcc4892814dea3c4385c7b9187db0c.png[/img] "[B]J[/B]" however stands for "[B]Joule[/B]" [I] [url]http://en.wikipedia.org/wiki/Joule[/url] The [B]joule[/B] ( /ˈdʒuːl/ or sometimes /ˈdʒaʊl/); symbol [B]J[/B]) is [U]a derived unit of energy, work, or amount of heat[/U] in the International System of Units. It is equal to the energy expended (or work done) in applying a force of one newton through a distance of one meter (1 newton metre or N·m), or in passing an electric current of one ampere through a resistance of one ohm for one second.[/I] ... and it's totally irrelevant in this context. :thefinger: [/QUOTE]
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