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/sci/ Science & Math

Threads added between 2013/05/08 and 2013/05/15

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Most viewed threads in this category

6 more posts in this thread. [Missing image file: Morphin_-_Morphine.svg.png]
Any1 able to help me with this chemistry question? never come across anything like this before and don't have the slightest idea where to start... The administration of 100 mg or more of morphine (molar mass 283) to a patient would probably be lethal. Which of the following would you consider to be a safe dose? a. 10 ml of a 5 percent solution (w/v) b. 10 ml of a 0.2 M solution c. 5 ml of a 100 mg/ml solution d. 3 ml of a 5 mM solution e. none of the above

Creatures like Weeping Angels

47 more posts in this thread. [Missing image file: weeping angel.jpg]
Out there in the galaxy if not the universe. Is it possible that evolution can conceive a creature similar to or like the weeping angels from the British sci-fi show Doctor Who? I honestly do not see how it is possible for an alien lifeform to suddenly become stone whenever it is aware that one is looking at them.
17 more posts in this thread. [Missing image file: 31cD+FAaN-L.jpg]
I have a bunsen burner, the type that uses a rubber tube where you just push onto the inlet on a counter top, I want to run it on one of those small propane tanks, I believe that I need a regulator. I have an old PC BBQ that has a regulator in it, should I try to use that, and another thing, how can I connect the regulator to the bunsen burner, what type of adaptors do I need? pic related, type of tank I'm using.
1 more posts in this thread. [Missing image file: TI-89.jpg]
Does anyone know how to do Cholesky factorization or Eigendecomposition on the TI-89?
2 more posts in this thread. [Missing image file: Rockwell_Hardness_close.jpg]
Is the hardness of a material a good gauge of stiffness? Do harder materials have more stiffness, or is this measured using a different metric?

Moon Colony on Far Side of the Moon?

19 more posts in this thread. [Missing image file: imagesizer.jpg]
I have a question /sci/. Lets say there will eventually be large moon colony someday. Do you think humanity has the foresight and decency to build it on the far side of the moon and not the side we see? I can see many potential problems if we have heavy activity on the visible side of the moon. For example: >possible destruction of the known features of the moon, features with cultural significance like "the man in the moon". Imagine generations who don't understand what that is because the moon has been changed and defaced. >possible dimming of the moon by pollution and activity so that an actual "full moon" isn't possible. >harm to biological systems, such as coral spawning and animal migrations/cycles that are based on moons. All of the problems I can think of would be easily solved by a far side moon base. What do you think, /sci/, is humanity smart enough to avoid this trouble? Is there bigger problems I am overlooking for a far side moon base?
20 more posts in this thread. [Missing image file: image.jpg]
What would happen if you stepped on a treadmill that was going at, or approaching, the speed of light?

Fuel Economy

13 more posts in this thread. [Missing image file: Fuel Economy.png]
Hey sci, Can we discuss the history of fuel economy in cars and trucks? Refer to the pic. In response to the oil crisis in the early 1970s, Congress passed some standards that called for doubling the passenger-vehicle efficiency within 10 years in 1975. This can be seen in the figure with car fuel economies going from about 13 to around 26 mpg. But then from about 1985 to 2005, fuel economy remained constant. I'm finding it hard to believe that for 20 years, no progress was made on technology that could make cars more energy efficient. I'm wondering why you think this is the case. Here's a couple of my ideas. Please discuss them and also present your own. 1) Fuel prices remained relatively low so there was not much pressure to increase fuel economy. 2) Energy companies subsidize research of the auto industry. As such, if some company comes out with a 50 mpg car, for example, they cease to fund this company, making it harder for this company to compete. This may seem like a 'conspiracy,' but really it's just pure economics. Why would an energy company spend money to see more efficient vehicles? This would result in them selling less fuel. 3) Car companies intentionally keep fuel economies low for sake of ensuring their long term success. Ex: Say an alternate fuel vehicle hits the market with lower fuel prices. Car companies can then compete by improving their fuel economies, effectively making their fuel prices lower and out competing the new technologies/new fuels. Do you think any of these theories hold water? Source for pic: http://www.pewenvironment.org/uploadedFiles/PEG/Publications/Fact_Sheet/History%20of%20Fuel%20Economy%20Clean%20Energy%20Factsheet.pdf
6 more posts in this thread. [Missing image file: Daniel-faraday.jpg]
Would it be a correct analogy to say that statistics is the shadow of probability?
5 more posts in this thread. [Missing image file: 1328363588174.jpg]
Why is everything in the universe spinning/orbiting? Where does the energy to spin comes from? Will it run out?
3 more posts in this thread. [Missing image file: 1366608973773.jpg]
>implying winter
20 more posts in this thread. [Missing image file: 644577_566978646667283_2054824117_n.jpg]
Something I've been wondering /sci/ In quantum mechanics you only ever hear about the act of measuring some property, but is it possible to do a partial observation? For example, instead of "measuring it's position" can you check to see if the particle is in a certain region? Obviously if it is there then the outcome is the same, but what happens to the state of the particle of it is found to NOT be in that region? I would imagine that all other probabilities would increase the more you rule out certain possibilities. Or is it just not possible? Although I can't imagine why it wouldn't be.
6 more posts in this thread. [Missing image file: 1341475131952[1].jpg]
How many ways are there to distribute 15 objects among five distinct assembly lines when the first two lines must get at least two objects, the third and the fifth line should get a non-zero but even number of objects and the fourth line gets any number of objects?

Education system and validation

50 more posts in this thread. [Missing image file: Philosoraptor.jpg]
(1 of 2) Here are some of my thoughts on the education system and how it rewards certain types of students. Please tell me what you think. Tl;dr: I dont think it is good for test scores and grades to be rewarded because it makes recipients validate themselves. And, those who dont get the high test scores and grades feel ashamed and inferior. The students who don't recieve high grades/test scores are no less important than the students who do. The high scoring student is just as human (and potentially just as useful to society) as a low scoring student. **** I think it is important to ask ourselves why we reward these high test scores. Is it to motivate other students to do better? This would imply that success in the world is directly determined by how well you do in school. They may be related, but I do not believe that- beyond doubt - it can be proven that high scores and high grades cause success in society. One can make an important contribution to society without having high test scores. Often, the opposite is what happens. In order to rationalize their apparent inferiority, students will begin to tell themselves that school, and more importantly inquiry and knowledge, are not important.
2 more posts in this thread. [Missing image file: 106px-Secobarbital.svg.png]
why seconal is secobarbital sodium or quinalbarbitone sodium. i mean, the molecule is the secobarbital and the sodium part is that when you drink it you are drinking it in salt form, how this works?

Home lab?

13 more posts in this thread. [Missing image file: snapshot.jpg]
Where can I go to get cheap lab supplies? I've been looking on ebay so far. Also, if you have a home lab please post some pics and tell us about any projects you've been working on. The pic is my measly lab. Hopefully it will be better this summer
9 more posts in this thread. [Missing image file: 289763.jpg]
If i slept: Monday - 8 hrs Tuesday - 7 hrs Wednesday - 7 hrs. Thursday - 7 hrs. 30 mins Friday - 7 hrs. 30 mins Saturday - 7 hrs. Sunday - 7 hrs. whats the average amount I've slept in one week?
14 more posts in this thread. [Missing image file: php.png]
I'm looking to learn a web based programming language this summer (either HTML or PHP) which one should I learn and why/how?
13 more posts in this thread. [Missing image file: Arrow_to_the_Moon_by_eldris.jpg]
If you shoot an arrow up while standing on the moon, would the heavy end then face downwards towards the moon on the way down? I was thinking that the acceleration should be the same on every part of the arrow, since there is no wind, so why would the heavy end start accelerating towards the moon first? Also explanation on why or why not is appreciated.
43 more posts in this thread. [Missing image file: 1332670584898.jpg]
If there's aliens why can't we see any radio activity of them? Or how about those self replicating probes?

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