Have gravity been proven? i don understand what gravity is or how it works. how is this a proven theory, when no one can prove gravity exist?
i dint get it.
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>>7983213
>Have gravity been proven? i don understand what gravity is or how it works. how is this a proven theory, when no one can prove gravity exist?
>
>i dint get it.
Yes
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>>7983217
Could you explain it then, if its so easy.
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>>7983221
Www.wikipaedo.br/gravity
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What is wrong with this picture?
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A isn't there
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>>7979723
A stands for area.
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>>7979726
oh man I'm really tired
Anonymous
When will they land on Earth? 2016-04-04 23:10:55 Post No.7979135
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When will they land on Earth? 2016-04-04 23:10:55 Post No.7979135
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When will they land on Earth?
Anonymous
2016-04-04 23:10:55
Post No. 7979135
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Will science be the only effective weapon against an alien invasion?
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>>7979135
Hate to break it to you but the jews are already here.
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>>7979135
theres a small possibility left that an alien race didnt figure out nuclear particle/forces
in this case: muuuuhahahaha
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>>7979141
What do you mean dude?
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Can we have a nightmare thread? First, tell me about successful Quants, Software Engineers, Investment Bankers.
Then, tell me about the dark side:
>That high school Science teacher with a P.hD in Biochemistry
>That high school Maths teacher with a P.hD Fluid Dynamics
>That unemployed P.hD Statistics
>Pic. related.
How do we avoid the mediocrity 'overqualified' trap?
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>don't be a lazy fuck
>get all 3.0+ in your major classes, and 3.7 in upper division classes
>do some undergrad research, even if its freaking cleaning your professors office
>don't be an assburger and befriend you profs and get good letters of recommendation
>get in the 90% of your subject gre
Congratulations you now got into a top 20 university. Enjoy your comfy academic career
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>>7978744
What if you are not able to finish your PhD ?
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>>7978775
>Those who can, do; those who can't, teach.
>Those who can't teach, teach teacher's training.
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/sci/ why do engineers make a fuss about Fluid Dynamics? Is it that hard?
> Senior CS here
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It's hard, but not the hardest.
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DRAGONFORCE is the hardest.
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>>7977096
Because you CS undergrads don't know how to do anything other than make pretty apps and websites.
Pic related is how you solve fluid dynamics problems.
I'll start with a question. Do all of these recent elements they create in labs exist anywhere in nature?
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>>7976876
Maybe in neutron stars or extremely exotic locations for a picosecond or two every month.
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>>7976882
This.
Although it's worth noting that there could be some synthetic stable elements farther along down the line. Pic related.
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>>7976901
And those are just elements that no star is massive enough to create?
How high would an ant have to fall to die? To human scale?
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The is no height that would kill an ant because it's terminal velocity is too low.
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With atmosphere, or in vacuum?
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they won't die.
an object falling over a long distance will eventually reach "terminal velocity"; that is, the deceleration due to air resistance (drag) will counterbalance the acceleration due to gravity, and the object won't get any faster.
because gravitational acceleration is a constant 9.8 m/s^2 (decently close to the earth's surface), drag force is a function of speed and of the object's surface area profile, and drag acceleration is the drag force divided by the mass of the object, that terminal velocity is going to depend on the object's mass and shape. because surface area varies as the square of length (roughly speaking) and mass varies as the cube of length, larger objects will tend to have higher terminal velocities.
terminal velocity for a human is something like 53 m/s, easily enough to splatter you into goop. for an ant, it's more like 2 m/s. that's something they can easily withstand.
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>27 engines
https://www.youtube.com/watch?v=m79UO4HOQmc
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FAKE PIC
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First Falcon Heavy launch is slated for March 2017 [postponed from October 2016].
I will eat my own poop if it actually launches in March 2017
[spoiler] I'm dead serious, i've done it before [/spoiler]
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>>7974292
they believed in deign by trial and error, the N-1 launches were tests, if Korolev didn't die and they didn't run out of commiebux they would have made it work
they probably should have just test fired the engines as a group to find thrust structure issues on the ground but whatever
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Will we ever see a man on Mars in our lifetime?
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>>7972487
If you live long enough, maybe...
Although I doubt you will see the American flag when man arrives on Mars.
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>>7972487
>be 42yo
>know you will die before man sets foot on mars or man returns to the moon
It is quite possible that neither thing will ever happen.
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>>7972515
The chinese are putting a man on the moon in about 5 years
You think you're so smart /sci/? Then answer this. You have 30 seconds.
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>>7964948
14?
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20
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how does the earths outer core have magnetic properties if the temperature is too high?
Ive been looking into it all morning and the geological science foundation doesn't touch much about the subject and conclude that its proven by only models and "believed" to be.
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>>7991311
iron has magnetic properties within a large temperature range, not just when hot
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>>7991317
curie point of nickel and iron is far below the temperature of the outer core.
so it doesnt add up how the earth is magnetic in the first place.
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>>7991311
>what is a dynamo
Is there hard science behind massage or is it holistic nonsense?
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>>7989928
This is more /fit/ but it has to do with myofacsial release
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>>7989928
I've actually wondered this myself. I know most of the holistic stuff is bullshit but I've always wondered about massage.
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It's physical therapy for the muscles, and such, the mind being affected by that. No, it's not magic voodoo shit, so your ruptured testicle won't heal because I rubbed your arm, but there are therapeutic effects
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The natural numbers and reals have the same cardinality, and I can show you why Cantor was wrong.
Let's consider the real numbers in base 2, and let's also consider [math]
S = \{ \\
1.00000..., \\
1.01111..., \\
0.10011..., \\
0.00000..., \\
... \\
\}[/math].
Now in base 2, there's only one option for how to change your digit for the diagonalization argument. The digit 0 must become 1 and the digit 1 must become 0. Otherwise, we couldn't guarantee each infinite binary string differs from the new one we'll create.
However, let's looks at the created binary string.
[math]
S = \{ \\
\textbf{1}.00000..., \\
1.
\textbf{0}1111..., \\
0.1\textbf{0}011..., \\
0.00\textbf{0}00..., \\
... \\
\}[/math]
Once you switch each digit, you're resulting string will be 0.111..., but in base 2, we have that 0.111... = 1.000... for that very same reason that in base 10, we have that 0.999... = 1.000..., and thus we have failed to reach a contradiction since 1.000... is a member of S.
In fact, if you rigorously go through Cantor's argument in any base, you'll have this same failure to reach a contradiction as is required, and this happens due to how the reals are closed under taking limits, which ensures their cardinality is the same as that of the naturals.
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I think you're supposed to be looking at the numbers with leading 0. If you drop this, then 1.11111... isn't found in your scheme.
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>>7988413
This is a strawman. Cantor's diagonilization proves that the set of all infinite sequences of binary digits cannot be listed. It is then shown that there is a 1 to 1 correspondence between T and a subset of R.
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>>7988562
Why strawman?
OP thinks he found a loophole in how one may get all numbers into a list, that's the point.
I'm still waiting for a counterargument for 1.111 not being listed, though.
Do higher spacial dimensions actually exist or is it just three dimensions + time?
If higher spacial dimensions do exist why don't we ever come into contact with higher dimensionsl forms in our 3D space?
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>>7987542
even if you were to see a higher dimension object, you'd perceive it as 3D. at any given time you'd see a 3D "cut" of the object, which may or may not alter in appearance if that object moves along the dimension we don't perceive
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>>7987542
>why don't we ever come into contact with higher dimensionsl forms
why do you assume that we don't, everything might have an underlaying (more like 'overlaying') structure in other dimensions.
time isn't a spatial dimension in the sense that your talking about. It's just a way to localise an event or item to a specific place in a specific time.
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We are the 3D projection of 4D beings onto a 3D universe. Which are the 4D projections of 5D beings onto a 4D universe. So on and so forth.
Anonymous
Insect consciousness thread, 2016-04-08 22:00:10 Post No.7989028
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Insect consciousness thread, 2016-04-08 22:00:10 Post No.7989028
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Insect consciousness thread,
Anonymous
2016-04-08 22:00:10
Post No. 7989028
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I know this question has been asked a few times, but let's have another one of these threads.
Do insects have consciousness? Are they conscious of their actions like we are?
Let's take a fruit fly (Drosophila), for example. A fruit fly can clearly find its way around an area. It can detect danger and fly away from it (e.g. me swiping my hand at it). It can carry out its biological actions, such as reproducing and laying its eggs. So, based on all that, would it be safe to say that flies are conscious and know what they are doing? What I'm asking is are they self-aware?
But on the other hand, they tend to fly towards any source of light and repeatedly bump into the window. Despite the fact that there is clearly an object preventing the fly from flying towards the light source, it continues to do so. Does this indicate a level of 'stupidity' in flies?
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>>7989028
Can an insect collapse a quantum mechanical wavefunction?
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>>7989036
C'mon, desu, be serious.
I want a serious scientific discussion on this topic. It's not explored enough.
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I think the consensus was insects neural system is very simple and is only hard wired to react to certain stimuli. Im not sure insects have much 'brain power' in the way we think of it i.e cephalized, central system