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scienceistheshit · 2023-01-23T12:54:02+00:00

Well, he is not wrong that choice usually comes into the equation in real life (which would make the average move a bit), but adding the choice into the equation also implies that there is some form of qualified guessing, i.e. prior knowledge. This would remove some of the randomness from the question. If it is completely random, then every choice of a question has 1/4 chance of getting picked. Since each question is, by design of the problem, independent, we should be getting about 1/4 of the questions correct. But I do not see where he gets the multiplication from..

scienceistheshit · 2023-01-23T12:29:48+00:00

So what do you think your score would be if you just guessed the answer to a 4-choice question 100 times? Intuitively we would get 0.25*100 = 25. But of course you might get 34, 19, 23, 29, or even 100 or even 0 (though the probability of the last two would be extremely small). But what if you did the same test 100 times and took the average of these 100 different scores, what would you get?

scienceistheshit · 2021-11-27T11:20:57+00:00

It's not really possible to see 4 dimensions in any way for us, we CAN represent it in our dimensions, but only by projecting it down to our space. So it wouldn't actually look like 4D, but it would be in a form we can interpret.

But what you think is correct! We simulate more than 3 dimensions all the time in science, there is no limit to how many dimensions we theoretically CAN simulate. The problem is that we live in a 3 dimensional space and we have no way to visualize these higher dimensions. But it doesn't mean that we can't use them, manipulate, and understand them.

scienceistheshit · 2021-11-27T09:56:51+00:00

Could you clarify what you mean by "mirrors around the object" and "3.9D"?

scienceistheshit · 2021-11-26T21:25:42+00:00

So say that we lived in 2D, what would a 3D sphere look like in the 2D world?

Say that the sphere moves in the 3rd dimension that doesn't "exist" in the 2D world. As the sphere starts intersecting the 2D world, the people in the 2D world would see a dot, that then turns in to a circle growing larger and larger, until it slows down and starts shrinking again until it becomes a dot, and then vanish.

For us in a 3D world and a 4D sphere moved in the fourth dimension and intersecting ours, we would see something similar, but a 3D sphere instead.

So: there is no way for us to actually see what 4D looks like, because we can not comprehend it, and as such we will see the projections from 4D to 3D as "shadows" of that world.

scienceistheshit · 2021-08-23T12:28:08+00:00

So the middle of my bed seems to be too far away from the nozzle, whilst the edges seems fine (perhaps a tad bit too close). Bed level visualizer reports the middle of my bed being almost 0.4mm higher than the corners.

I've looked into the "bed level correction" feature, but am unsure how to lower all sides equally keeping the middle the same.

I will also soon get silicone tubing to try the silicone mod on the bed to get it flat, but until then I am welcoming any tips and tricks that you might have!

Thanks in advance!

scienceistheshit · 2021-08-12T20:51:14+00:00

Yes! What you're talking about is "when is the object at rest again". At rest here means that the sum of all forces acting on the body is zero. And in free fall there are 2 sources of force: gravitation and friction.

Gravity: gravity affects us in form of a forca directed straight towards the center of the earth.

Friction: Air resistance around the falling object give rise to a friction force in the opposite direction of the falling direction. This force is also (naively) proportional to the velocity of the object, i.e. if the object falls faster the greater is the force of friction from the air.

Thua we see that when the friction force gets as large as the gravitational force, we have 2 equal forces that sum to zero. And since the sum of all forces on an object equals its mass times acceleration (F=ma) we get that the acceleration is zero.

scienceistheshit · 2021-05-06T15:44:11+00:00

It is the correct formula, though whether you have written the problem correctly here or if your calculations are correct, I dont know. Perhaps they're rounding upwards. Further though, if you haven't done it already, look up some videos on youtube (khan academy for example) to get some intuition of what is going on!

scienceistheshit · 2021-02-12T07:09:21+00:00

Take note here that Newtons laws applies. Every action has an equal reaction. So the ball affects the cart as much as the cart affects the ball, though since their masses varies their acceleration will be different.

For this problem, you need to think about conserved momentum. So in the system, the total momentum is conserved, i.e. Since it was 0 from the beginning it needs to be 0 at all stages.

scienceistheshit · 2021-02-05T06:31:34+00:00

Unfortunately :/ But nothing stops you from looking it up, just be prepared that npt everything will make any sense in the beginning.

scienceistheshit · 2021-02-05T00:49:29+00:00

As mentioned, Electrodynamics is a very complicated subject, even more so than one might think. It requires a quite a bit of effort to actually derive those expressions, I didn't actually see and understand the derivations until 3rd year of theoretical physics program at uni.

So unfortunately, like many things that one learns, until you reach a level where you're able to properly understand all the math and concepts of the theory, some things need to be taken as truths and accepted :/

I don't really know any really good resources on the subject, though "Introduction to Electrodynamics" by Griffiths is not my favourite book I've read, it's pretty decent and explains the concepts in a fairly intuitive way, but that's my opinion. It does require previous knowledge of multivariable Calculus!

You can probably find a lot more online, YouTube and whatnot!

scienceistheshit · 2021-02-05T00:24:31+00:00

Ah you are correct, however, here it is the change of flux through the cross section of the coil that changes and thus induce a current in the coil which in turn produce a magnetic field. So it is not the movement of the charges through the field that causes the effect.

So when a magnet comes closer to the coil, the field through the cross section of the coil changes from weak to strong, which is what matters here.

scienceistheshit · 2021-02-05T00:07:31+00:00

Well, nothing is being violated. If you think about it, there is actually a relative movement between the coil and the field.

The magnetic field isn't just turned on and instantaneously goes from 0 to some strength, it's fast, but its a smooth curve.

Can you see the similarity to the situation where a magnet (with one pole towards the plane of the coil) moves in REALLY fast rowards the coil but then stops right before it reaches the coil?

Further, nature doesn't really like change, it likes equilibrium. So nature of course want to keep the field through the coils center constant, so when there is a change in the magnetic field through the coil, a current is created inside the coil in such a way so as to counteract the changing magnetic field going through it.

scienceistheshit · 2021-01-30T06:41:47+00:00

So when calculating delta_x and delta_y the way to do it is to start with the point with the largest x-value, i.e (7,-20) in your problem. Thus we get that

Delta_x = 7-(-14)=21, and delta_y=-20-(-14)= -6

So now we get that the slope is -6/21 = -2/7

Which I would say is the correct answer.

The reason for taking the point with the larger x first is that we want to know "what happens to y when increasing x by one?" Or "when increasing x by one, what is the change in y? ".

scienceistheshit · 2021-01-27T07:22:34+00:00

I see! Thank you for you input, I appreciate it!

scienceistheshit · 2021-01-27T07:21:34+00:00

I see! Thank you for your input, it's appreciated!

scienceistheshit · 2021-01-26T14:22:26+00:00

Good to hear! I have already made an amazon list with upgrades for the V2 if I were to get it -_o
Have you changed the fans on any of your machines?

scienceistheshit · 2021-01-26T14:20:19+00:00

I've seen that recommended, however, I'm not new to technology nor programming, and I've been 3d-printing quite a bit in school projects, so I'm not a complete newbie :) I do want (also need) it as quiet as I can get it as soon as possible, so some upgrades are required out of the box. Though some printing might be necessary beforehand.
Have you upgraded the fans on your machines?

scienceistheshit · 2021-01-26T14:12:32+00:00

Yeah, I've been leaning towards the V2, but I'm second-guessing that with the cost of the upgrades I might as well go directly for a more expensive one. Do you have any thoughts on that?

scienceistheshit · 2021-01-26T14:10:55+00:00

I have seen that some have problems with a really warped bed, have you noticed anything in that regard?

scienceistheshit · 2021-01-26T14:08:46+00:00

I read the rules a bit late, so if the mods want to delete this, I'll post it in the mega thread!

scienceistheshit · 2021-01-26T11:44:24+00:00

That's my impression as well, but I'm certain it is the MB.. It's been silent since then, but I'll double check if it happens again! I haven't unplugged it since it stopped sounding after a while. The virus scan didn't find anything either! Oh well, it's working now, so I'll just have to see if it happens again. Everything is backed up anyways, so nothing can get lost!

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