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/sci/ Science & Math

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Most viewed threads in this category

0 more posts in this thread. [Missing image file: 56oE1.png]
I know I'll probably get a bunch of "lel homework" responses but this is technically prelab work and I'm stuck. So anyway, I'm doing a rotational motion prelab. Diagram of what the device looks like attached. In the following problems, assume the following parameters: Mass of the bottom steel disc: 1.4678 kg Mass of the upper steel disc: 1.4795 kg Mass of the upper aluminum disc: 0.4614 kg Radius of each disc: 63.3 mm Radius of the take-up spool: r = 125 cm Mass of the falling weight: 25 grams 1. Using the values given above, calculate the following: a) The moment of inertia of the lower, steel disc b) The moment of inertia of the upper, steel disc c) The moment of inertia of the upper, aluminum disc d) The combined moment of inertia of the two steel discs Which I found to be 2940.7kg mm^2, 2964.1kg mm^2, 924.39kg mm^2, and 5904.75kg mm^2 using moment of inertia= 1/2 MR^2 (capital M and R to denote different values from m and r to follow) 2.Using the results of problem 1, what percentage error is made by neglecting mr^2 with respect to I in the equation (mgr)/(mr^2+I) where I= Inertia I'm not sure whether to use exact values, or to just manipulate formulas for 2. I've tried both, gotten significantly higher percent error than I should've (the check is to affirm that we can neglect mr^2 due to really low percent error). Any help would be greatly appreciated.
29 more posts in this thread. [Missing image file: mass-relay.jpg]
So /sci/ No doubt you've heard of the NASA attempting to make warp drive thing (first small steps). What does sci think? http://techland.time.com/2012/09/19/nasa-actually-working-on-faster-than-light-warp-drive/
4 more posts in this thread. [Missing image file: WAT.jpg]
Hi there /sci/ Does anyone know how I can convert FSH and LH mIU's to ng/ml? Google didnt' help much. Any advice?
0 more posts in this thread. [Missing image file: 1320460167597.jpg]
Are contradictions impossible in the universe or are they just incomprehensible to the human mind? We believe "anything follows" from a contradiction but maybe that isn't the case. How could we know if contradictions are limitations on what can happen in reality instead of just mental limitations we can't conceptualize? What if a species that could harness the power of contradictions was able to achieve mathematical and scientific superiority
9 more posts in this thread. [Missing image file: 1335414906767.png]
Is anthropology just bullshit?
9 more posts in this thread. [Missing image file: latex_logo[1].png]
Sorry to be a huge faggot but can anyone spot wtf I'm doing wrong here. I've narrowed it down to the commented lines, but they all look fine to me and uncommenting any of them breaks the compile. I'm pretty sure 4chan is going to fuck up the formatting. \begin{table} \begin{tabular}{|l|l|l|l|l|} \hline $y \in [a,b)$ & Observed Pregnancies & $p_0$ & $np_{i_0}$ & $\frac{(k_i-np_{i_0})^2}{np_{i_0}}$ \\ \hline % [0,230) & 1 & 0.0122 & 0.854 & 0.025 \\ % [230,240) & 5 & 0.0394 & 2.758 & 1.823 \\ % [240,250) & 10 & 0.1071 & 7.497 & 0.836 \\ % [250,260) & 16 & 0.1933 & 13.531 & 0.182 \\ % [260,270) & 23 & 0.2467 & 17.269 & 1.902 \\ % [270,280) & 7 & 0.2119 & 14.833 & 4.136 \\ % [280,290) & 6 & 0.1226 & 8.582 & 0.777 \\ [290,$\infty$) & 2 & 0.0668 & 4.676 & 1.531 \\ Total & 70 & 1 & 70 & 11.212 \\ \hline \end{tabular} \end{table}
24 more posts in this thread. [Missing image file: fuckin v.png]
Argument on another board needs a solution Halp /sci/
63 more posts in this thread. [Missing image file: Andrew Wiles.jpg]
Define zero. Go.
108 more posts in this thread. [Missing image file: dr-neil-degrasse-tyson-3.jpg]
Does Neil deGrasse Tyson come off as an elitist prick to anyone else? Really, i used to have far more respect for him, but then i watch a StarTalk where he interviewed Alan Rickman. He was making comments in response to Alan Rickman's difficulties with physics during his school years that would often culminate in something to the effect of, "So then you became an actor!". It was the delivery that rubbed me the wrong way, as if he was suggesting his own position as an astrophysicist was the only noble and respectable path or position, and others were comparably effortless and meaningless. His mentioning philosophers as "Wasting a lot of ink" and "distracting themselves" with issues also came off as asinine, as though he believes philosophy and science to be adversarial fields of study. Am i missing something, here?
7 more posts in this thread. [Missing image file: concussion.jpg]
Can a thrown snowball to the head induce a concussion?
8 more posts in this thread. [Missing image file: 135343991879.jpg]
Can someone explain how the cross and dot vector products work? How does a.b=abcos\theta?
8 more posts in this thread. [Missing image file: GIANTSATEN.jpg]
Okay so Scientists have invented material that slows light down to relatively very slow speeds. What would happen if you took these materials, built a giant window out of them that's really thick, and transported that window backwards faster than the light moves in that medium, so that the light was effectively moving at negative velocity? But then at the same time you have light moving at normal speed moving into the glass, but as soon as it enters the glass it moves backwards because of the effective velocity? What if you had a glass that slowed downed light by centuries, and when you broke the glass, would it unleash all the stored light at once? What if you had a glass like that, but the delay was 12 hours, and you held it up during the day to the sun and during night you put it on your ceiling and then you have lighting without electricity? What if you built an air medium that slowed down light to less than a centimeter per second, put people to live in it and laughed at them when they reacted slowly to changes around them?
22 more posts in this thread. [Missing image file: Bruice6e[1].jpg]
How are all you first quarter/semester o-chem students doing out there? Top of your game? Middle of the pack? Struggling? I got my third and last midterm tomorrow, then finals coming up in a week. The stories are true: o-chem runs a big portion of my life nowadays. And holy fuck this week of studying has been an unrelenting barrage to drill resonance and SN1 SN2 pathways in my head. Obviously it's not conceptually difficult, but it sure is a fucking load to know. Pic related: My beloved textbook I spend more time with than anyone else. ;_;
17 more posts in this thread. [Missing image file: black-background.jpg]
Do any introverted STEM majors lurk this board? I'm just wondering how people cope with loneliness and/or social isolation. I've been attending a fairly small college for a few years, but haven't really found it easy to strike up conversations or find friendship. In before gb2/soc/, this is about the only board I share any commonalities with. Sage away.
5 more posts in this thread. [Missing image file: 1353896112563.jpg]
How would you cite 4chan /sci/ in CBE citation style?
31 more posts in this thread. [Missing image file: 1349326357661.png]
>Interested in Chemistry, Genetics, Microbiology, and Neurology. >Shit job prospects in every field. >Don't want to become a faggot/engineer. Hold me, /sci
42 more posts in this thread. [Missing image file: B23.land_of_psychedelic_illuminations.jpg]
Intellectuals of 4chan, share your infinite wisdom. Do you think certain drugs (Psychedelics and Cannabis but I will focus on psychedelics ITT) should be legalized? I am of course referring to traditional 5HT-2a agonist psychedelics like LSD which have a very high safety profile and a virtually non-existant potential for addiction. Can such substances actually benefit an individual by helping one explore their consciousness in a way most don't? Carl Sagan, Timothy Leay, Aldous Huxley and of course Richard Feynman believed they could, although Feynman was embarrassed to speak publicly about his experiences with psychedelics. He did however believe there was some benefit to this and did in fact use them on a few occasions, look it up. What's /sci/'s take? Should they be legal? Can they benefit those who wish to explore the nature of consciousness? Or do they just make you trip balls with little or no positive benefit? Huxley believe they disabled filters on our perceptions instilled over the course of our evolution, allowing our mind and its interface with the "physical universe" to be more accurately examined, or so he argues in "The Mind at Large". I seriously just want /sci/'s opinion on psychedelics? Should they remain prohibited? Do they have any potential to help one learn more about some aspect of nature? I am neither advocating nor condemning drug use, I'm just interested in what /sci/ has to say, considering many influential scientists and intellectuals believed they were valuable tools to explore the nature of consciousness.
0 more posts in this thread. [Missing image file: Genegun.jpg]
>"So, Agrobacterium tumefaciens doesn't work on corn. The fuck do we do?" >"Fuck it, let's cannonball the genes into the cellular core." God damn I love biotech.
4 more posts in this thread. [Missing image file: indolencevsdeadlineproximity.png]
Why do I always screw myself up like this
2 more posts in this thread. [Missing image file: bosspokemon.jpg]
alright /sci/, lets have a debate. in terms of human intelligence and learning, is the nature (Humans are either born stupid or born smart and no tampering can change that) or nurture (Human intellect can be increased through how they're raised and education) is correct and why? >pic unrelated






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