Archived threads in /sci/ - Science & Math - 649. page
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What went wrong?
We didn't fund it.
>>7638843
The transformation of economics from a science to a religion.
Hey /sci/, I'm thinking about changing my major to physics and go on to grad school to get a Ph.D. What kind of jobs would I be able to get with a Ph.D. in physics?
Breast Animator at Kojima productions.
>>7638813
Sign me up!
Whatever will give you prestige and status in the world, go for it.
But you'll probably just teach
what's the best way to self-study? when i'm reading the cs/math books everything makes sense, but i can't seem to REALLY grasp the underlying principles and really move deeper. I'd hate to ask people questions and getting my hands held every couple pages just to double-check if i'm on the right track. am i just dumb? how do ya'll study and learn new concepts/theories? t-thx
>>7638749
just smoke some weed
>>7638749
That's a bit vague.
Anyway, after you have finished reading something, you can try solving the exercises at the end of the chapter. It can actually makes you deepen your understanding. Doing exercises is what you should have done anyway.
If you are not used to reading, then for most of the time, your thinking process will be really skewed and limited. There are things that can be seen only when you do exercise (i.e. work you brain more than reading).
>>7638800
Study high
Take test high
Get high scores
What do the Blacks think of Black Science Man?
Interested not interested senpai
>>7638683
As a black person who is relatively involved in academics, I'm not impressed. He's a "pop-sci" figure. He doesn't actually make discoveries or create anything novel; he just reads and parrots.
The physicist whose life goal is to build a time machine to reconnect with his deceased father is way more inspiring
Hey /sci/, got a n00b math/signals question:
If I have a simple signal sin(x), I can convert a sample taken at some point (x,y) on that signal to a complex number by using Euler's formula. e.g. the point (pi/2, 1) on the sine curve becomes complex number 0 + 1i on the unit circle in the complex plane.
What if the signal is not a simple sin(x), but is some arbitrary non-periodic signal? How do you convert an (x,y) sample into a complex number?
>>7638652
Pretty sure about this, but not completely. With your notation, a point (a, b) would become
b * e ^ a*i
= b (cos(a) + i * sin(a))
so in your example,
(pi/2, 1) => 1 * e ^ (pi * i / 2)
= cos(pi/2) + i * sin(pi/2)
= i
= 0 + 1i
for a general function f, its representation at a point x is given from applying the above formula to (x, f(x)).
(x, f(x))->f(x) * e ^ x * i
= f(x)(cos(x) + i * sin(x))
>>7638665
thx. what's the reasoning for multiplying by b (or by f(x) in the last example)?
>>7638685
That's the part that was making me not completely sure. It's a system consistent with the example you gave, but I'm not sure it's correct.
I'm thinking that f(x) will be the magnitude of the complex vector and x will be the vector's angle.
Is Thorium just a meme?
>>7638452
No, it's also an element.
>>7638452
Yep just like the EM drive.
Nope, it's a viable alternative to uranium/plutonium plants. The only reason that it's not as popular is that building a nuclear power plant costs a lot of money and the companies building them need huge subsidies from the government to start. And the politicians don't want their names to be associated with nuclear because it makes them unpopular.
Yup, the hippies ruined this for us.
So what Erdos number does /sci/ have?
Mine's 24
>>7638432
0. People think I died but I just forgot to take my amphetamines.
Prof at my school I aaaaaaaaaalmost published with has erdos number 2.
I'm still fucking pissed that never panned out.
>>7638438
it's alright, erdos number over time is a decreasing function anyways now that the great air dish is dead
How do I make one of these at home. No, I'm not mentally handicapped. I'm simply bored.
>>7638364
Bump for interest. I also want to know if it's worth it to go into amateur EM drive research
>>7638422
>microwave parts
>thousands of dollars
Would something as this be treatable? Will the doctors have to involve surgery to align all the bones into correct position after which they fix it, or is it done in some other manner?
>>7638310
It's very hard for a double fracture to ever heal completely. that pic looks like leaves. what do you think?
>>7638321
I don't know, hence why I am asking. Just wondering if something like this is possible to fix without amputation.
That would not be treatable; amputation is a must.
Our regenerative capabilities are limited.
If you where to go in an elevator step on a scale and go down you would "weight less" Because of the normal force being reduced.
Is this because since force is mass times acceleration and when you go down you accelerate downward therefor cancelling out the normal force? Also what if you stopped accelerating and went at a negative velocity (Downward) would the normal force already be cancelled out from before and not come back?Also what if you where to move faster than gravity (-9.81) would you experience a "negative normal force" or like complete cancellation...
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>>7638219
>stopped accelerating and went at a "negative" (Downward) constant velocity ***
wtf
you would just free fall
>>7638219
draw a goddamn FBD like they do in high school
If I shine a flashlight into a handheld mirror, obviously the light bouncing off the mirror is moving at the speed of light. Now if I give the mirror a quick snap of the wrist, I've just increased its speed beyond that of light to Light + the Speed of Wrist Snap. And I didn't achieve infinite mass or anything. Conclusion: faster than light travel is possible.
QED
>>7638211
Are you trying to push light with your mirror? Because that's called blue-shifting.
>>7638211
snapping the wrist what way?
if you are trying to impart the force onto the light which you can't do then you are an idiot.
No, the information has changed, not the path of photons
You know how mankind has always been stopped by the fact that the fastest speed communication can be achieved is the speed of light, right?
Well, what if a I was on one planet, and someone else was on another planet 1 light year away.
I have a giant 1 light year metal rod that I push back and forward to send signals to him.
Faster than light communication achieved.
I think I'll enjoy my Nobel Prize now.
>>7638185
Are you the same person making this thread every day?
You're literally watching VSauce right now.
4CHAN WEABOO REVOLUTIONIZES MODERN PHYSICS WITH ONE WEIRD TRICK PROFESSORS DON'T WANT YOU TO KNOW!
In accordance with real economics (any case) analyze the following statement: “Consumers will not start spending again, until laborers go back to work and producers begin making a profit”
Can you help me /sci/ ?
bump2
The statement suggests just why the world is in serious financial trouble.
There are 3 parts here
1: Consumers will not start spending again, until
2: laborers go back to work and
3: producers begin making a profit
Considering labourers are at work and that much is outsourced or automated, part 2 is just meaningless.
Part 3 is a logical short circus. You might as well reduce this to “Consumers will not start spending again, until Consumers start spending again".
Brilliant, isn't it?
. o O (and "real economics"??? )
aren't consumers and labourers the same entity?
/sci/, how come I can't retain any information?
Every time I study (which is hell already because I postpone and get distracted and shit) I forget the material learned within a few minutes. And retain maybe 10% after a day.
Currently I'm in engineering school and I'm failing because I simply can't remember things long enough for the test. This applies to everything from mathematics( I can't grip concepts for shit) to downright simple shit like bussines.
>inb4 not learning enough
This is why understanding the method is much more important than memorizing the process.
Are you cramming that shit or something?
What are your study habits?
Are you sleeping well? How's your mood in general?
What's the highest compression ratio that I could get out of a plastic compressor? I want to 3D print a centrifugal one. I intend to put this value into pic related in order to find out what flow rate I can get from a given power input. My book said centrifuges compress air isentropically so I worked with that.
>>7637988
>My book said centrifuges compress air isentropically so I worked with that.
they don't. thats a simplifying assumption made for intro thermodynamics classes. you haven't gotten to the part about isentropic efficiency yet.
designing turbomachinery to spec is hard m8. you are better off just slapping something together in solid works with a 45 degree vane angle and figuring shit out empirically.
ie, build it first, then sort the math out based on what you have.
>>7638001
>isentropic efficiency
Tell me more, my book says nothing about this.
> figuring shit out empirically.
Of course I'll take readings from the finished product but I need to know if it's feasible first before building anything. 3D printing filament is actually quite expensive, ball bearings even more so. Just need a rough idea
>>7638001
Plus I can over-engineer to compensate for using a basic theory. Theory says x, make it 1.5x
