I'm going to kill myself if the EM drive isn't real.
>>7640898
I don't see why they can't whip one up and strap it to a satellite or some kind of fairly simple probe and give it a test run
Like keep testing it sure, but multiple of these things have been made (since multiple places are testing them) so surely it would be worthwhile to actually field-test one and see if it holds up outside of a laboratory setting.
>being this much of a space exploration fanboy manchild
space is BORING AS FUCK stop pretending that getting off of this planet would magically solve all of your problems
>>7641197
wow pleb
What does /sci/ think of timed tests? I think they are bullshit.
My chemistry professor gives us a timeframe on our exams so we have about one minute per problem. Now, I understand everything conceptually, but math is not my strong point, so I need time to set up full dimensional analysis or work through calculations in a formula a step at a time, and doing this I get most of the practice and homework problems right, but I only get low B's and C's on exams cause with the time limit not only is feeling rushed working against me, but he expects us to know immediately what to do, including shortcuts.
Are timed tests just a way to create a more pronounced bell curve (separate the xceptional from even those who just good?) Any tips for dealing with exams like this? Are profs like this just shit?
there is a difference between solving the problem in 1 minutes and 10 minutes. you challenge yourself to work faster. whats wrong with that ?
I agree with you, but what are you going to do, fail? Man up and get gud. Become exceptional.
>>7640804
Their is no math in chemistry that should take longer than a minute. You don't know the concepts
How bad is glyphosate?
>>7640669
About as bad as people's comprehension of basic ecology, evolution, and glyphosate's degradation rate. Have fun dumping on more and more to combat an increasingly resistant population. Have fun with that soil accumulation.
Round-up ready is garbage, laughable, infantile engineering. Genetic engineering has potential as of yet far untapped. This fucking irresponsible joke is not something to applaud, it's a disgrace. It's banal. It's shameful.. Unfortunately, real innovations like won't often come from the private sector. I don't fully know where or how, but as it is now, it's all completely pathetic.
>>7640684
Oh look, it's the anti-science naturalnews faggot...
>>7640692
Oh look, it's that person that doesn't realize they're religious.
Correct me if im wrong. A Photon is like a single partical of light.
My question is what shape is is ?
A wave ?
A string ?
A sphere ?
Are particles are assumed to be points
>>7640630
String->Sphere->Wave->Sphere->String
Rinse repeat, though Wave and String are interchangeable then comparable on the bounds of the Fourier transformation
>>7640630
A wave packet
Learn about Fourier Transforms
What does /sci/ think about John B. Calhoun's mouse utopia experiment and how do you think it will reflect on humans?
>>7640541
It's already happening in Tokyo and Sweden
I think that all the people who don't know what John B. Calhoun's mouse utopia experiment actually is about should look it up on google. Because I am just a lonesome retard who cannot imagine that people do not know John B. Calhoun's mouse utopia experiment. After all John B. Calhoun's mouse utopia experiment is so important that it received its own thread on /sci/.
https://www.youtube.com/watch?v=0Z760XNy4VM
This is an idea for a closed-system propulsion device using a theoretical EM-pulse-emitting antenna fixed inside a closed rectangular prism floating in space.
I AM NOT SUGGESTING THAT I THINK THIS WILL WORK.
However, I don't know enough about physics to know why it won't work. I am asking you guys why this won't do what the image shows:
>antenna emits a pulse of energy, system should not move because it causes an equal and opposite force on all sides of the antenna
>pulse hits the left side of the box, exerts force F1 on the left side of the box, and the whole system moves to the left
>later, pulse reaches the right side of the box and exerts force F2 on that side
>F1=F2 so the box stops moving
>box is now in a different place; another pulse can be emitted to continue in this direction
>>7640499
I've been thinking something similar actually so i'll give you a bump for answers. Originally i was under the impression that sending this pulse of microwaves or whatever it has to be (some energy) wouldn't cause a force on the box, but if it does why wouldn't this work, along with the EM?
it's already a thing senpai
>>7640525
It would indeed impart a miniscule force. See solar sails.
>>7640530
I can understand why this device shouldn't work given current model of physics. Because the microwave energy is constantly emitted, the force on both sides of the device is constantly the same, if you consider the forces on the inside of the cone part pushing it back in the direction of the small end. My idea is different because the energy comes in one single pulse at a time, which will make the whole system move and then stop as it hits each wall
>2015
>there's still no effective cure to baldness
What the hell is taking so long, /sci/? My hairline is starting to recede and I'm not ready to go bald.
there's a reason why cavemen had more hair and aliens have no hair m8. its evolution getting rid of the excess hair
>>7640501
I don't want to be bald, anon. ;_;
>>7640507
unless your have good looking long hair, being bald is pretty attractive to many females. Just lift some weights and you'll grow to love it.
I just realized that if we lost all of our technology we would have to start over by lighting a fire first.
just think about the process from making a fire to building a space shuttle
amazing
ebin thread
needs more le black science man
ALL of our technology? That includes shit like matches and lighters, anon.
Is this worth publishing? It's the only series for the golden ratio that I've ever seen apart from the Fibbonaci definition and the super obvious Taylor expansion of the square root of five.
>>7640434
I've seen you post this 3 times now. At this point if you don't publish it I will.
>>7640434
ask your math prof
>>7640437
You can't publish it without a proof. Also you spend way too much time on such a shitty board.
>>7640443
I have no math prof, dropout
>>7640437
You know what do publish it, I'm not in the maths loop anymore nor do I want to be. I won't give you the proof because if you can come up with it yourself then you deserve credit irregardless of being second. All I will say is trigonometry, binomial theorem and complex analysis. Good luck and goodbye.
Could one man build a spaceship and fly it into outer space on a one-way trip?
you're retarded for asking this.
Anyway. There's not a single man that can build a spaceship on their own. Even so he couldnt build the rocket to get him to space.
Unless he had a big deal of money and bought stuff/hire people to construct it. Even so.. even if he got to space he d run out of food supply sometime. Or he d go crazy from loneliness before that.
>>7640439
Build yourself a gigantic canon and launch your body into space.
Seed other planets with your sacrifice.
Cluck entire galaxies.
>>7640430
ELON MUSK
Cool trio of vids using Galois Theory to solve an example cubic equation, hope you enjoy:
https://www.youtube.com/watch?v=Sg97_Azxvjo
He also has a playlist deriving the Abel-Ruffini theorem which is great but pretty long.
>>7640421
Pretty cool. Thanks OP.
Really fucking nice.
Thank you for the share, OP.
Watched 10 minutes from the first one already.
Why just a cubic?
Why not a more interesting, say quintic or above, with solvable Galois group?
Every cubic is solvable so I don't see how this is that interesting.
It is kinda interesting, but could have been better.
Is it better to encrypt a entire file as a string. with AES 128bit or to encrypt every line individually??
AES is a block cipher, in the 128-bit case it only takes 16 bytes at a time. To encrypt more than 16 bytes, you might need a way of chaining the blocks together. You can choose not to do that, and equal input blocks will result in equal output blocks (ECB mode), which gives hints about the data . Look at https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation , look for the penguin in ECB mode, that's your problem. You can also decide to XOR each input block with the previous cipher block (CBC mode) before encrypting. You can also keep a counter and think of a number you're only going to use once, then encrypt the number and counter and XOR blocks of input data with the resulting 16 byte value (Counter mode).
ECB is weak and shit both when encrypting all of it or lines at a time.
CBC needs a way to initialize the first block, an initialization vector (IV). If you encrypt individual lines, take care that you're not using the same IV twice, or else you can do some analysis on that shit.
Counter mode needs a number used once (called a nonce). Never use that twice: you'll generate the same blocks (called the keystream) you XOR your data with, differential attacks become possible.
I'd encrypt the whole file in one go: you don't have the repeated key problems that CBC and counter mode give you.
>>7640393
for encrypting I am doing the following
import java.security.Key;
import java.security.MessageDigest;
import java.util.Arrays;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
public class EncryptDecrypt {
public String EnCrypt(String text, String key)
{
String r = "";
try
{
//Pad Key
byte[] keyB = (key).getBytes("UTF-8");
MessageDigest sha = MessageDigest.getInstance("SHA-1");
keyB = sha.digest(keyB);
keyB = Arrays.copyOf(keyB, 16); // use only first 128 bit
// Create key and cipher
Key aesKey = new SecretKeySpec(keyB, "AES");
Cipher cipher = Cipher.getInstance("AES");
// encrypt the text
cipher.init(Cipher.ENCRYPT_MODE, aesKey);
byte[] encrypted = cipher.doFinal(text.getBytes());
r = new String(encrypted);
}
catch(Exception e)
{
e.printStackTrace();
}
return r;
}
}
>>7640406
*Note* Ill be feeding files into a single string, than encrypting the single string... I do not plan on doing huge files currently.. so this should work fine.
20 initial Θ-data into the construction of Θ^+/-ell NF-Hodge theaters and he gives you this look
>>7640362
>that guy's face
Gets me every time.
>>7640362
respond with
>“You don’t get to say you’ve proved something if you haven’t explained it. A proof is a social construct. If the community doesn’t understand it, you haven’t done your job.”
>>7640362
in every single picture of him he looks visibly disgusted he has to be around other human beings
I just started to read Basic Mathematics by Serge Lang because I feel that my mathematics foundations are not strong and solid and frequently I get sloppy at reasoning while solving some problem.
This book is terrible. Find something else OP
>>7640386
From what I've read so far it seems pretty good, I'm not sure you know what you are talking about desu
op, start with this for a strong foundation (preferably in order):
-pre-algebra
-algebra
-euclidean geometry
-trigonometry
-logic/model theory
-precal and calculus
plenty of pdf's online
to not get off on a rocky start, search for pdf lecture notes
Is mathematics the purest science?
>>7640282
define pure and then you'll see
physics is the most pure. mathematics is not a science, it's in a category of its own. its just mathematics.
>glorified sudoku puzzle solving for unemployed and developmentally regressed neckbeards
>mental masturbation without basis in reality
NOT SCIENCE