Archived threads in /sci/ - Science & Math - 2181. page

Astronaut Matt Damon has been stranded on Mars with no hope of rescue

>>7637318
pfft just more NASA lies

>>7637321
Wat
Ney

>>7637299

They have done this, with electromagnets. They are called MagLev trains.

>>7637309

why not use this technology for the rest of us? At least, on a much smaller scale.

>>7637299

>Why not make a "road and floating car"

Expensive as fuck, no one will give two shits about it.

>>7637298

Focus on nuclear power, renewable energy is pretty much a joke compared to nuk.

>>7637298
I've heard that fusion power could run on seawater, using heavy water as fuel. It would only create helium (a useful resource in itself), and could last for a very long time (thousands of years, I think; long enough to find a replacement or leave the planet).
Is this reasonable, assuming we can get fusion to work, or is the an oversimplification?

>>7637314
That's the gist of it really - the main assumption there is that we can get a working commercial reactor at all. But if we can, it's effectively a renewable resource (I think that it's more than just thousands of years, but don't quote me on that).

>>7637145

I'm finishing up my math undergrad, which isn't really high level math, but basically things only get significantly harder when I skimp on the pre-requisite material.

If I have a good understanding of how all the lesser concepts work, and then it's just a matter of how they come together to form another concept. It's not bad.

>>7637160
did you see anyone else hit a wall?

>1.)
Mensa is just a circle-jerking waste of time. If you have a high enough IQ (not equivalent to being smart), why would you waste your time with it?
I think they do offer some scholarships and other small benefits for members though. If you have the time to kill and think you'll get in and enjoy it, go for it I guess. Just be prepared for the real life equivalent of /sci/ shitposters and popsci fans.
And I'm not just mad and biased here. I don't know my IQ but it was high enough in grade school to be admitted to the gifted program and get auto-admitted to the gifted program when I moved to a new school district. I also started college at 16, so I think there's a good chance I could make it in to Mensa if I wanted.

>2.)
People who were good at math in high school probably didn't have to study for it. So, when they hit higher level math that requires dedication and memorization they just didn't know how to cope with it. There is also this huge misconception to the general public about what higher level math is; they all tend to think of cramped, hurried scribbles of various physics equations when in reality it's mostly just logic and proofs. So, a lot of people probably didn't know exactly what they were getting in to. Hell, I didn't even exactly know what I was getting in to but I was able to just roll with it.
There's also the fact that math can become extremely abstract very quickly once you hit uni-level stuff, whereas you (or at least I) only dealt with very concrete, real numbers throughout high-school.
I'm in my 4th year of a math undergrad and the biggest wall I've hit is how painfully boring certain subjects are to me. That makes it extremely difficult to learn the subjects, but most of it comes from a lack of motivation.

>but something without mass cannot interact with something that does have mass right?

What gave you that idea?

>>7637143
>but something without mass cannot interact with something that does have mass right?

Why would you assume that? That seems rather silly.

>>7637143
It says it has 0 mass. It then lists the inertial mass.

>>7637133
You're going to wind up working in a gas station.

>>7637136
I need serious answer please, Im having second thoughts

>>7637140
>Can i be charged with academic dishonesty?
yes

Neuroscientist here. I'm on my phone right now, so I'll keep it short. It has to do with their general wellbeing. A bunch of experiments on mice showed a lack of addiction when their environment was stimulating. Other mice developed addiction when confined to a cage lacking in stimulation. The same effect has been observed in humans, people develop addiction when they "need" the drug for stimulation. Obviously I missed a bunch of details here, but that's the general idea

I think they do sometimes. But seeing as it would be a serious liability the doctors must take steps to avoid it. Environment and the way a drug is administered could be important too. A person compartmentalizes things that happen in the hospital, you know? The habit of finding the drug yourself and injecting it yourself requires an almost seperate conditioning process.

>>7637096

Okay you're kidding me if you don't know this.

Most commoners wouldn't but /sci/, I am ashamed.

Addiction is much less of a chemical attraction and more of a mental issue.

It all depends on the conditions of how and where the drug was used.

The political economy of URSS
History mixed with economy and statistics.
t. Math student

All of statistics by wasserman

>>7637028
would that taste good

>>7636907
Yes, fill it with explosives

yeah, look up ray guns, death rays etc. there's some experimental work done, but it's mostly theoretical.
I'm sure it's being worked on in secrecy.

File: Particle_Beam_Rifles_Halo_3.jpg (65KB, 1280x711px) Image search: [Google]

65KB, 1280x711px

>>7636907
yeah, just open it up.
>What is a particle beam

File: Untitled.png (4KB, 503x384px) Image search: [Google]

4KB, 503x384px

>>7636900
I'll start off
flat surface can only provide a perpendicular counter force right?
second question is this picture,
I'm supposed to find the angle of the bar at which this construction is in balance but I can't seem to find the right equations to do this

>>7636917

This is a statics questions. You're missing relevent info required to solve it. An angle or another length is required.

>>7636920
no other info is given
if you would make this construction the bar would move itself to a certain angle, I just need to know that damn angle
but I don't see how

It is likely....
{citation needed}

>>7636753

you wouldn't be able to see the tiny planetesimals 2 light years away...

it's like the asteroid belt. people think of it as some dense field of asteroids but the whole asteroid belt's mass is ~4% the mass of the Moon...

it's just a region that contains a lot of asteroids

>>7636753
We have to find the Oort cloud first punkass. As of right now it is still just a theory. No major physical evidence has been presented to confirm its existence

They are the exact same as us so of course it's healthy. Why wouldn't it be?

Not that it's the best diet but it's not a bad one.

>>7636751
The fact is it just significantly limits and cuts carbs sources that are unnecessary since people are lazy slobs.... That's it.

Cavemen didn't eat like that. So... no.

Here, watch a video. http://tedxtalks.ted.com/video/Debunking-the-Paleo-Diet-Christ

>>7636582
You're increasing your potential energy, thus doing more work. In principle on a flat frictionless surface going round the Earth you would basically be able to keep moving forever once you started, moving uphill this is not so.

The force of gravity pulls you directly toward the center of mass of the Earth.

The normal force, the force that keeps you from going through solid objects like the ground, is always perpendicular to the surface.

So on a hill, the normal force is at an angle while the force of gravity is still straight downward, so less of the force of gravity gets counterbalanced by the normal force.

>>7636590
Going round..... lol
its flat mate

>>7636532
Imagine that electricity is water or some other incompressible fluid, flowing down a pipe. The water molecules are actually electrons.

Voltage, measured in Volts, is the pressure in the pipe. The voltage difference between two points is a measure of how much energy it would take to move a charged object between those points - or how much energy would be released by letting it move the other way. (Moving an electron across a voltage of 1 Volt takes exactly one electron-Volt (eV) of energy, for instance).

Current, measured in Amperes, is the ... current. It's the rate at which electrical charge is flowing through the wire in a given moment; the derivative of electrical charge with respect to time.

Like with water currents, if you multiply the voltage (pressure) by the current, you get the power carried by the electricity. Power in electricity is measured with the same units you measure power anywhere else - Watts.

A Watt is one Joule per second; Joules are the generic metric unit of energy.

>>7636554
Thank you, that helps a lot.

>>7636554
Doesn't pressure in water pipes increase flow-rate though?
Also how do you make sense of spark gaps with this analogy?

Beast at math speaking. My childhood was lonely. At least I had the numbers to keep me company. Really, I had infinite friends...

>>7636483
What are/were your study habits?

>>7636483
>infinite friends...
kek..