<p>E = mc^2 gives the amount of energy, E, released when m kg of matter is detroyed in a process such as nuclear reaction. The constant c is the velocity of light, 2.998 * 10^8 ms^-1. The unit of measurement of the energy realeased is kgm^2s^-2. Find the amount of energy released when 5.000 * 10^-2 kg of matter is destoyed.</p>
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<p>WHAT?! im so confused</p>
<p>How would you graph the exponential growth of Y if it’s doubling every time.</p>
<p>Y = ?</p>
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<p>I believe you can assume an optical cable is cylindrical in shape. Find the area of the base (r^2*π) and multiply by length (2000m). </p>
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<p>Square c and multiply by your mass. That’s total energy released. You can check it dimensionally: c^2 has units of m^2s^-2, multiplied with mass (kg) gives you kgm^2s^-2. </p>
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<p>y = x^2. That’s power growth, not exponential.</p>
<p>ok thanks CT. :)</p>
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<p>just wondering-how did you figure that out?</p>
<p>Care to read my essay? (No one else seems like they want to!) =[</p>
<p>It’s dimensional analysis. A basic technique of physics.</p>
<p>Oh, gotcha.</p>
<p>Can you sing?
What’s your favorite mathematical symbol?
What calculator do you use?
Have you ever played World of Warcraft?
If scientists were going to take a few thousand people to start a colony on the moon, would you go?</p>
<p>“Can you sing?”</p>
<p>Most people can, I’d prefer not to. ^_^</p>
<p>What’s your favorite mathematical symbol?</p>
<p>Symbols are arbitrary and don’t mean anything. ^_^</p>
<p>What calculator do you use?</p>
<p>Ti-83+. Yeah I’m outdated. Sometimes mathematica/maple/matlab</p>
<p>Have you ever played World of Warcraft?</p>
<p>I downloaded the trial and explored the world for like 2 hours before my attention span expired. </p>
<p>If scientists were going to take a few thousand people to start a colony on the moon, would you go?</p>
<p>Not to the moon. 
There’s so much more on the Earth</p>
<p>How can I improve my visualization skills and by extension my understanding of mathematics and science?</p>
<p>Do you think I would get very many responses if I started a thread on the topic?</p>
<p>Will you tell mj93 that I think the answer to her second question is ‘yes’?</p>
<p>Will you tell rockermcr that he is often sarcastic in his posts so I will not act on his response without first hearing your opinion?</p>
<p>(no offence, rocker :))</p>
<p>Will you tell mj that I’m definitely not being sarcastic?</p>
<p>Will you tell rocker that he has said that before when he was indeed being sarcasting thus losing my trust with these kinds of things?</p>
<p>Will you tell mj that I really am not sarcastic if I say that I’m not being sarcastic, and will you also tell her that I know what instance she is talking about, and that I really wasn’t sarcastic then?</p>
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<p>Hm, one suggestion: learn the right hand rule.
<a href=“http://en.wikipedia.org/wiki/Right_hand_rule[/url]”>http://en.wikipedia.org/wiki/Right_hand_rule</a></p>
<p>And get it very well known. That rule is central in A LOT of math/science. </p>
<p>Another suggestion: look at diagrams of multivariate functions (one suggestion is to look at a calculus textbook like stewart, and to look at the “which function is this, which function is that” in the exercises on 3-D representations of functions). Although that may not be the best route for a 9th grader.</p>
<p>Maybe looking at 3-D biological structures (and their 2-D representations on paper) would also help (in which case a biochemistry book would help). Such as the 2-D representation of the double helix, or the 2-D representation of phosphate-base pairs. </p>
<p>I have problems with visualization as well (and I still do).</p>
<p>I have a friend who’s going to college. Do you have any suggestion on what should I get her? It should be useful or at least remind her of me but shouldn’t take up too much space in her dorm.</p>
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<p>Hard to say here, it’s possible you might have better luck on <a href=“http://www.physicsforums.com%5B/url%5D”>http://www.physicsforums.com</a> or <a href=“http://www.sciforums.com%5B/url%5D”>http://www.sciforums.com</a>. </p>
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<p>haha <a href=“http://talk.collegeconfidential.com/showthread.php?t=82285[/url]”>http://talk.collegeconfidential.com/showthread.php?t=82285</a></p>
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<p>[url=<a href=“http://xkcd.com/199/]This[/url”>xkcd: Right-Hand Rule]This[/url</a>] may help with that. :D</p>
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<p>outdated? psht, I still use a scientific.
(then again, I also play games that were released in 1985.)</p>