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/sci/ Science & Math

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Most viewed threads in this category

14 more posts in this thread. [Missing image file: 081.gif]
why is physics so fucking hard /sci/ im in first year engineering, and while chem and math are coming along easily (quantum mechanics, derivatives and so forth), physics is raping me in the literal asshole I did well in phys 12 in HS, (90%), we went over all of classical mechanics including EM and Circuits. I thought it wouldnt be this hard but holy fuck this shit gets retard complicated. Any tips for excelling in physics? I tihnk some people have the same problem with math. People in my calc class are running into magnitudes of difficulty, but for me it's very straightforward because it's juts one thing. But with physics, it's either my teacher or my curriculum, but everything is one jumbled fucking mess. For instance, my first midterm is on ALL classical mechanics. Taking first year physics w/ calculus usage.
1 more posts in this thread. [Missing image file: american science.png]
what is your favourite pop-science magazine? Science Illustrated? Scientific American? etc etc...
3 more posts in this thread. [Missing image file: Desert.jpg]
Intelligence can be developed or is an innate hability?


1 more posts in this thread. [Missing image file: 1363376332637.jpg]
In general relativity photons always follow the spacetime geodesics. Their path is therefore uniquely determined. In Feynman's path integral formulation a particle travels ALL paths. That means there has to be non-zero probability for the photon to travel a path that isn't a geodesic. Which one is wrong? GR or QM?
1 more posts in this thread. [Missing image file: image.jpg]
How do get smarter?

IQ is stupid

10 more posts in this thread. [Missing image file: giraffe and elephant.jpg]
OK, I have a great Stanford-Bennet score, I love how that has allowed me to skate through some things without any actual work but I gotta admit that the whole idea of rating something as complex as a human mind one a one dimensional linear scale is simple minded at best. The test was developed to identify the mentally handicapped for use in primary education and it does that well enough but to describe the difference between Einstein and Shakespeare? Absurd. A few things I want to say before asking for response: Me, personally, I took a battery of tests recently and they verified things I already knew. My long term memory is peak; like top 0.001%. My short term memory is well below average. The IQ score I get on every test reflects none of that. In biology the intelligence of a very simple animal is judged by testing “responsiveness to the environment”. If you present food or poke them with a stick some mesofauna respond quickly, others slowly. By this standard the guy trying to study his math while the music and laughter from people partying in the next dorm room distracts him is not responding to his environment. But of course it is simple minded to call him the stupid one. I knew a maintenance man who had vastly superior spatial functions and pattern recognition. He could barely speak English, his native language. Once he and I were walking down the hall and found a small black plastic thingamabob. “Dis dat fing offa da floor scrubber macheen.” He said. “Does it come off a lot?” “I dunno. Never seent it afore.” “Then how do you know what it is?” “Cause it like dis.” He moves his finger in the air to describe part of the shape of it. When we got to the janitors closet he reached down and popped it back in place. “I get some ‘poxy so da axle don get wallered out.” What was his IQ? Probably 80. My point is there are a lot of things that make up a mind and a composite number simply does not tell the whole story.
0 more posts in this thread. [Missing image file: walter-white-photograph.png]
I read science and meth. No precursors discussion here, disappointing.

Operator norms

3 more posts in this thread. [Missing image file: David Hilbert.jpg]
I'm stuck on showing that the usual definitions of linear operator norms are equivalent. So far I have that \|A\| = \sup_{x \leq 1} \| A x \| = \sup_{x = 1} \| A x \| But I'm having trouble showing that \|A\| = \sup_{x < 1} \| A x \| is an equivalent definition. Pic related.


0 more posts in this thread. [Missing image file: Matrix System.jpg]
HELP!!! I'm writing a speech right now due tomorrow about the theory that life and the universe is a virtual reality simulation controlled by a more advanced civilization that us. And I'm having trouble finding credible and easily legible sources to use. Do you guys have any material I can work with? Also, any info you have about this subject would be appreciated. This is an informative speech, so I can't make it sound too bias.
2 more posts in this thread. [Missing image file: magnets.jpg]
4 more posts in this thread. [Missing image file: amplutihedron_span.jpg]
Can someone explain this to me, and why it is such a big deal, like I am a 5th grader?


8 more posts in this thread. [Missing image file: oh_you!.jpg]
Mrs. Ligon I know you browse this board so I am going to have to ask you to stop, because its weird.

NMR and a prior knowledge of physics

2 more posts in this thread. [Missing image file: Benzene.gif]
Hey guys This is my first time posting on this board. I am a novice biochemist (as I like to call myself :) ) and I am in my first year of college. I have a really strong background in chemistry and I managed to challenge out of a beginner chemistry course. I am currently doing an independent overview of major beginner organic chemistry topics as I want to beat curves in that class. I have recently finished reading on IR spectroscopy and I am about to move onto NMR for the hell of it. Before I do it, what should I know about it in relation to physics? I know that a solid physics background helps alot in chemistry. It took a physics course to help me understand thermodynamics fully but I am still lacking in the physics department. Before I start this reading, should I stop and do a quick study up on electromagnetism? If so, what do I need to know? My Ochem textbook will probably offer a weak not to indept overview but I want the whole picture.

Finding Ka of a weak acid...

10 more posts in this thread. [Missing image file: gottapost.png]
Dear sci, My friend is currently taking a chem lab class that I took two years ago, and he came to me with a question that I remember was extremely frustrating for me when I took it. The question is: "In the titration of a weak acid with a strong base, the pH was 4.23 after the addition of 15.23 mL of base. The endpoint for the titration occurred at 30.46 mL of titrant. THe pH was 8.32 at the endpoint. What is the Ka of the acid?" Not remembering how to answer this is bothering me, anyone know how to solve this question when the only concentration data they've given is H+ concentration at both points?

Financial Engineering

0 more posts in this thread. [Missing image file: le speechless man.gif]
Anyone here interested/pursuing/curious/knowledgeable or have an opinion on the intensive multidisciplinary field known as financial engineering? Degrees leading to a possible career in the field are the most notoriously difficult in undergrad academia, the programs are few and far in between, 'hush hush' mentality by the benefactors of the practice, the material dense, and the ignorance of it's existence by the world's most educated all help lend an intrinsic and extrinsic veil around the discipline.
2 more posts in this thread. [Missing image file: mickey.jpg]
weirdos http://www.youtube.com/watch?v=4WaUcXSfPTg

Horrible Teachers/Test Taking Experiences

1 more posts in this thread. [Missing image file: Some Bullshit.gif]
Can we get a thread like this? I remember a really good one a while back that reached about 300 posts. I just finished an exam and, unfortunately, just realized that the sadistic teacher really does aim to fail like everyone tried to warn me about. Whelp, I'm in for a rough semester. >mfw at the end of the exam when 3/4 of the class was still taking it.


0 more posts in this thread. [Missing image file: elephant-toothpaste-o.gif]
Hey /sci/, I need you to answer me a quick question. I am doing in a project in 2 weeks in my chemistry class in which I have to display and explain a chemical reaction. I signed up a little late and everyone took the easy reactions, such as the egg in vinegar and the baking soda volcano.I was thinking of making elephant toothpaste. I have or can easily acquire all of the ingredients, but my only problem is the potency of my hydrogen peroxide. It is only 3%, while most sources suggest 30%. I figured I couldn't counter the lack of potency by increasing the amount used, but I may be wrong. I want to know if any chemistry nerds on /sci/ knew more about me here and could steer me in the right direction. >tl;dr I need help making elephant toothpaste.


12 more posts in this thread. [Missing image file: saturnV.jpg]
I want to talk about rockets+ Now, clearly reusable launch vehicles are no longer the fashion so let’s address what I see as an opportunity for improvement in traditional rocket design. Getting from 0 to 5 kph. If you have ever seen a launch you don’t need to do the math to figure this apartment building sized structure pushing itself off the ground on a column of flame is burning a lot of fuel. Slowly, laboriously large rockets inch themselves upward. It seems if you were running alongside one you would be winning for the first 100 meters. If you have ever pushed a car or truck it takes a couple guys to get a heavy car rolling but a sturdy 12 year old can keep it moving after that. The Saturn V (pic) uses 1.2 million liters of LOX and 770,000 liters of kerosene to fly its first 162 seconds. That’s a lot of juice. At this point it is 67 km off the ground. Amateur rocket clubs get (admittedly smaller) payloads that high all the time. So, what other options do we have? Ballistic: Sure, shooting a rocket out of a gun sounds tricky but not impossible. It could even be pneumatic: no fire until we ignite the onboard engines.
9 more posts in this thread. [Missing image file: 1393250_677866325567715_625471738_n.jpg]
how does /sci/ feel about this? egregious, imo.. and stupid.. eat some dirt faggots. enjoy.

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