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/sci/ Science & Math

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Most viewed threads in this category

retarded college student v2.0

28 more posts in this thread. [Missing image file: 220px-De_template.svg.png]
I have to write a program that calculates the smallest, largest, average and the range of a set of numbers but just can't seem to get it, what is wrong with this? #include <iostream> using namespace std; int main() { double smallest = 0; double largest = 0; int count = 0; double sum = 0; float value; cout << "Enter values: "; cin >> value; while (cin >> value) { if (value > largest) { largest = value; } if (value < smallest) { smallest = value; } } count++; sum += value; if (count > 0) { double average = sum / count; double range = largest - smallest; cout << "The average is: " << average << endl; cout << "The smallest is: " << smallest << endl; cout << "The largest is: " << largest << endl; cout << "The range is: " << range << endl; } else { cout << "You did not enter enough data" << endl; } return 0; }
37 more posts in this thread. [Missing image file: 1368409559730.jpg]
After seeing many threads that debate the pros and cons of various forms of electrical energy generation, it got me thinking, wouldn't it be easier to decentralize power generation? Aside from NIMBYs, I couldn't see anything to go wrong with it.


12 more posts in this thread. [Missing image file: Molymod-MMS-008-detail2.jpg]
Guys, I am taking Organic Chemistry I and II with labs this summer. What is the KEY to doing well in Orgo? I'm not asking for herpa derpa hacks. I mean what is the SMARTEST way to study and score high marks?
13 more posts in this thread. [Missing image file: IMG_1698[1].jpg]
So i thought up this theoretical physics question. I asked a few friends, a few professors, my parents (rocket scientist), and got a bunch of completely different answers. What the picture is trying to show: In a completely empty universe, absolutely no other sources of light. There is a single planet that is absolutely motionless. Exactly 10 Light years away, completely out of nowhere, a beacon of light springs into existence and immediately begins to travel towards the planet at 90% Light speed. This beacon is producing a steady and constant light in all directions. So, here's the question: Exactly 10 years after the beacon appears, the light from the initial point will reach the planet making it visible for the first time. But at this same point in time the beacon has traveled 9/10ths of the way to the planet. So after 1 more year the beacon will collide into the planet. So what do you see during the last year when the beacon appears 10 LY away when it's actually 1 LY away? My guess: During the last year, the light from all 9 years worth of light would have condensed into a single years period giving the beacon the effect of traveling at 10 times the speed of light toward the planet. Why i'm not sure if this is right: I know nothing of the relativity of matter at light speed.
0 more posts in this thread. [Missing image file: monapoepsa.png]
How would I go about decrypting the following? ykkg://nnn.lekzkcvu.tfd/kdg/ulssvcdfirc.yho hlv vc Nvs jzkv tfekzvev le yho reóezdf tipgkvu vc rityzmf vetfekiruf p rtivuzkruf pr gfi le dzvdsif uv evfnze. tlreuf vj jze tfdgizdzi, vc rityzmf uvc yho tfekzvev le rityzmf uvc ivtlijf uvc ijit grir cfj ljlrizfj uv Drtzekfjy. Cr vokvejzóe uvc ijit tfekzvev ler zdrxve hlv jv rjvdvar r ler wfkf gvhlvñr uv le alvxf jlvtf wrdfjf ccrdruf Ulssvcdfirc p jv grivtv jzxezwztri ler grikv uvc drgr uvc alvxf jí dzjdf. Vc efdsiv uv cr cftrczqrtzóe vj mzrscv jzxezwztri rcxf vjgvtzrc uvc jzkzf.
43 more posts in this thread. [Missing image file: miller-urey.gif]
What is the origin of life?
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?
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

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.
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?

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