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/sci/ Science & Math

Threads added between 2013/10/23 and 2013/10/30

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Most viewed threads in this category

22 more posts in this thread. [Missing image file: Zinc.jpg]
Why does taking zinc before bed cause extremely vivid dreams? I still can't find the answer to this, does anybody know? Go into the details please, I'm very interested.

Hooke's Law help

2 more posts in this thread. [Missing image file: untitled.png]
Need help with a Hooke's Law problem. Pedro Martinez is standing on the planet Baseball (r = 5000 km, m = 7.0 x 10^24 kg) with his favorite spring (k = 100 N/m) in his hand. If he puts a 1.2 kg mass on the end of the spring, how far does it stretch? If he then slowly removes 0.3 kg, how far up does the remaining mass move? What mass would be required to stretch the spring 0.35 m?

At least one public class is required in main file

11 more posts in this thread. [Missing image file: Java.jpg]
Hello I found this code online and tried to execute it using compileonline.com , I tried other codes too, I always get this error: Error - At least one public class is required in main file no programming background so I have no clue, help? one of these codes static void FindMultiple() { long lcm=1; for(long i=2;i<=20;i++) { lcm=FindLcm(lcm,i); } System.out.println("Lcm="+lcm); }
1 more posts in this thread. [Missing image file: nuclear-plant.jpg]
I have a quick question for /sci/ If a nuclear reactor is temporarily shut down due to repairs and there is no danger of a tsunami or an earthquake, is there any possiblity of a nuclear disaster while the reactor is shut down?

Valuation: Solving for mean reversion weights

4 more posts in this thread. [Missing image file: Screen Shot 2013-10-24 at 4.42.10 PM.png]
So, I’m in the process of building a financial model, and while my business/accounting logic is sound, I’m running across some problems when it comes to basic algebra. I want to slap my teenage self in the face, for all those times in high school that I boasted that “I’m never going to use this,” and so on. Sigh. That said, maybe you guys can help me out. The basic premise of the model is to take inputs from a company’s financial statements, and convert them into multiple valuation outputs, based on different growth scenarios. Although it doesn’t really concern my algebra troubles, the model calculates residual earnings per share (EPS charged against a chosen cost of capital) for two years into the future, and then extrapolates these values into the long term, based on multiple different scenarios that the user can set. These different growth scenarios are built by looking at a short term growth rate (such as the company’s current growth) and then a long term average growth rate that all companies should hypothetically and eventually revert to. For the sake of my model, I look at the long term growth of the S&P 500, and conservatively pick 4% as a long term growth rate. Then, by assigning different sets of weights to short term growth and long term growth (the weights must sum to one), the model extrapolates values going, say, 40 years into the future.

Axiom of choice

12 more posts in this thread. [Missing image file: 1379885972990.gif]
From wikipedia: (...)The axiom of choice asserts the existence of such elements; it is therefore equivalent to: Given any family of nonempty sets, their Cartesian product is a nonempty set. But isn't it very easy to prove? If each set contains at least one element, then their cartesian product will contain at least the ordered set of these elements...
63 more posts in this thread. [Missing image file: image.jpg]
I am not much into science or anything but this seems like stupid misinformation. It was posted by some pseudo-hippie bullshit page. What does /sci/ think?
11 more posts in this thread. [Missing image file: 1334123186520.jpg]
I need some advice /sci/ I'm currently taking Biology I at USC using Campbell Biology. No matter how much I study I can't seem to regurgitated all the information from the readings and get an A on the tests. What are some methods other Biology majors/ premed used to do well? What are some good resources for Biology?
23 more posts in this thread. [Missing image file: 1383164322961.jpg]
i cannot sigh hard enough.
16 more posts in this thread. [Missing image file: E2670_Sulphurous_Antioxidant_Complex_90.jpg]
Do antioxidants have any real benefit?
40 more posts in this thread. [Missing image file: IMG20131003_184837_-1614238029.jpg]
Is the big crunch still possible?
13 more posts in this thread. [Missing image file: image.jpg]
Is Scientism reprehensible, or a force for good?
68 more posts in this thread. [Missing image file: Untitled.png]
Find D


2 more posts in this thread. [Missing image file: IMG_20131030_053548.jpg]
2 more posts in this thread. [Missing image file: conundrum.bronze.jpg]
n=0 n/n=0/n 1/1 = 0/1 1=0 if n = 0 then 0 = 0 0/0 = 0/0 (0/0)*0 = (0/0) *0 n/n = 0/n = 1/1 = 0/1 n/n = 0/n 1 = 0 (n/n) n = (0/n) n 1 = 1 nn/n = 0n/n = no solution exist 1= 0 or 0=0 = indeterminate or no solution exist. Is there any way to do this?
4 more posts in this thread. [Missing image file: 1382578285629.gif]
I have absolutely zero knowledge in the topic of how REM sleep works... but I'm a fan of theorycrafting and imagine the possibilities. That being said- What if we could some how induce an REM state without sleep? As in, being able to be in that REM state whilst walking around doing your daily routine. Perhaps using a device that externally stimulates the brain, or even just using a pill that provides the chemical precursor... Imagine having REM 'sleep' whenever you're feeling tired. Except it wouldn't be just like taking a scoop of jack3d or cup of coffee leaving you exhausted afterwards... it would be genuine restful 'sleep'. Except you're not actually asleep.
9 more posts in this thread. [Missing image file: 300px-Op-Amp_Inverting_Amplifier.svg.png]
does /sci/ know anything about using operational amplifiers? specifically in a guitar pre-amp. i have an IC a found at school that's supposed to be a op-amp, got a potentiometer from GC,a 9V, and my guitar that i have wired to a breadboard to test this out. i have had no luck so far, but i did read somewhere that it won't work if there's more powering the chip than what's going through it. so do i need a smaller battery or what?
2 more posts in this thread. [Missing image file: sum-geometric-series.jpg]
If the sum of an infinite geometric series turns out to be negative, does that mean the series diverges? For example if I have sqrt(2)^n, where the series starts at n=0, then I have 1/(1- sqrt(2)). Is it OK for me to assume that it diverges because my answer is negative? Is there a rule that says this, and if so, what is it called?
1 more posts in this thread. [Missing image file: image.jpg]
VCE biology exam in 3&1/2 hours any last minute tips for someone who knows fuckall aboug biology

Growing out of Popular Science

1 more posts in this thread. [Missing image file: stupid.png]
I've been subscribed to Popular Science since I was a teenager, and I enjoyed it for a long time. Now it's becoming apparent that Popular Science skims over a lot of important details, sensationalizes minor discoveries in medicine, and makes tons of meaningless (and, historically, almost always inaccurate) speculation about the future. Worse yet, recent issues have basically been catalogs for the latest overpriced impractical gadget that silicon valley shit out. All that's really worth reading in the magazine anymore is the occasional accidentally informative article or How 2.0 writeup. Because the enjoyable sections of the magazine are growing increasingly slim, I think it's time to move on to a different publication for keeping up with the latest advances in science. What do you recommend, /sci/? Bonus points if it has a DIY section like Popular Science.

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