First off, the Earth would explode!!! The range of pressure in Earth's inner core is about 330 to 360 gigapascals (3,300,000 to 3,600,000 atm) and that explosion alone would turn us into mush before we had time to enjoy a moment or two of weightlessness.
Excuse me ,sir. How come that people that stays in the outer space for a long time comes back in Earth-still looks the same as what they look when they left?
@micanikko Do you mean how time slows down inside the rocket? these is because rockets that orbit the earth go at 18,000 miles per hour, so the clocks in the rockea are seconds slower than the clocks on earth, therfore the faster a rocket goes the slower the clocks, the record for going in the future is 0,2 seconds and the guy spended 728 days in outer space and yet looked as if he hadent changed.
Hey just had a question from my physics class I was a little confused about.
When you are moving in a circle as the earth rotates about its axis why is the centripetal direction towards the earth's axis and not the center of the earth?
Hey just had a question from my physics class I was a little confused about.
When you are moving in a circle as the earth rotates about its axis why is the centripetal direction towards the earth's axis and not the center of the earth?
@jasminmaghs as i said, the centripetal force is the force required to keep you on the ground. if your at the equator, this force is at it's maximum and points towards the centre of the earth. At the poles, the force is zero. As you move from the pole to the equator, the force will gradually increase, but it will always point towards the axis of rotation.
hi physicist i wanna ask u wat would the world be like without our perceptions interfering with it ? i mean without the perseptual world that our body receives and translates into real time stuff, thanx
@ASKaPHYSICIST i mean that we see through our senses, its perceptual reality, maybe not objective reality, i guess asking this question would be stupid, but what exists outside our own perceptual world
@ali1278 Hi, i think i can make sense of your question and my answer is energy colours, our brain makes sense of energy with our senses,the colours exist of white and black in their purest forms, be broken down into red, green and Indigo as they become interfered with and split, then that is where your perceptions come in, your brain further makes sense of all these colours making the spectrum or rainbow colours. The information from the eyes makes up only 10% of what we see!
@annusingh9 im not sure if this is the answer you're looking for.....but the bigger an object is in space.....the bigger gravitational pull it has.....thus the planets revolve around the sun......moons revolve around planets and so on.......but im not sure that's the answer you're looking for
Great video! Your exploding Earth scenario at G=0 got me thinking it would be great if you made another video about the shape of the Earth, e.g. why it's flattened and why/how it is affected by tidal forces, why the Everest is about as tall a mountain can be on Earth, etc. And if you even find a simple way to explain spherical harmonics to the layman, you're really the best ;-)
That's a tough one. I would like to say gravity, as we perceive it, is a result of Einstein's theory of General relativity. However, it was shown that GR is not compatible with quantum theory, so we cannot yet say for sure what the fundamental nature of gravity really is.
ok i have a question im not a astronaut or wat ever, but why does only earth has gravity as much and not other planets, as they have so little gravity why is that ?
I have a question regarding gravity. Since Moon and the Sun's gravity are responsible of the natural phenomena on earth called tide and lets say and agree that water is a form of layer on earth. Now, imagine a greater scale of planetary alignments? What happens when all planets gravities align into one singular line? Could it possibly pull a deeper layer of earth like our tectonic plates and cause drastic continental shifts and sink and rises of lands? From my logical thinking I came to this...
Because from my theory, the core of earth is super compressed and the outer layer is pressing against the core, and from that friction of minerals create energy and also generates magnetic field (and gravity towards center earth). Now, alignment of all other planets gravity could possibly grab earth's surface from much deeper layer like i mentioned earlier about tectonic plates. Do you think this is what we will experience during galactical scale alignments?
My idea is anything that exists have its influence to its surroundings, and the existence of gravitational relation is like a contract between the two or more, and the rules applied can differ depending on the participants (planets, comets etc..). An example sample question would be, could other planets gravity have effects on our weight on earth? Or it doesn't need to be human mass but anything that can have its weight measured. what do you think of that?
"it was my understanding the 7 frames per second was the recording speed for videos as well, which would have been inadequate. A simple misunderstanding ... you retarded anal whore." interesting comment from a 'scientist'. not very astute at observing. also quite vulgar and with the haircut of a pedophile.
"it was my understanding the 7 frames per second was the recording speed for videos as well, which would have been inadequate. A simple misunderstanding ... you retarded anal whore." interesting comment from a 'scientist'. not very astute at observing. also quite vulgar and incredibly dorky looking.
What force is expanding space and how is it overpowering the gravitational effects of things like supermassive black holes? Or do some parts of the universe remain stationary while everything around them expands?
I think you're referring to what is known as 'Dark Energy' or the term in the equation for the expansion of the universe known as the 'cosmological constant'.
I can't really tell you much about it, but while we would expect the matter in the universe to fall back on itself due to gravitational decceleration, it is actually causing it to accelerate away. I'll talk more about it in my next episode.
The other day, I had a lengthy discussion with my mother, where she argued that the gravitational effect of the moon may affect human behaviour (this is a widespread belief). I argued that the g forces that act on us when for example, jumping or moving, are much more significant then the force exerced on us by the moon, and that this is evidence that the gravity of the moon has no real behavioral effect on us. Am i right in this reasoning? Are gforces essentially the same as "moon gravity"?
well, the moon has a gravitational pull on us. not nearly as strong as that of the earth, but i guess it could affect us in ways. of course jumping and moving produces stronger acceleration effcts, but you couldn't deny that they are always linked to our behaviour, so how is that a counter argument?
I do hear that the position of the moon is some how linked to child birth ... like tides in one's amniotic fluid. I dont think there concrete studies thouh
IT HAS BEEN PROVEN THAT the moon alters alot of activity, cause humans evolved using the moon as light to help hunt at night. The moon is a considerable part of life on Earth, since with out the moon, the Earth would wobble like crazy and NOT spin on it's axis, so it's basic common sense the moon has more than just gravitational effect hundreds of thousands, maybe even millions of years ago. No moon, maybe no life on Earth.... the temperature fluctuations would be to harsh to hold life...
@ASKaPHYSICIST : the moon is just a small object buzzing around the earth. Sure, its been around for very long years and sure it must have given some influence to the way earth may have span but at what % of influence? Earth would naturally fix its self even though your theory of wobble was correct because if the earth is like a gyroscope, the wheel is still spinning inside earth which would help balance its self again.
I presume you're talking about the "full moon effect", which presumes that peope display agressive behaviour more frequently under a full moon.
If this indeed that, the no, that is absolutely not proven. In fact, there is no scientific evidence that makes a strong case for this effect. There are some studies that "suggests" that it may exist, and there are even more that suggest it doesn't.
Are there any planets or stars where centripetal force is greater than gravitational force i.e g > v^2/R. What happens if g = v^2/R??
And 1 hard question. How much time would be needed for the atmospheric particles to go away and in how much time the person on the north pole would feel to wear the breath mask?
Also, what are the factors determining the time required for the Earth to explode if gravity suddenly disappears? Is it its mass?
Actually, even if you were standing on the rotational axis, you would still inevitably drift away.
This is due to the fact that all mater has a certain degree of compactability.
If you think about it even from the scale of atoms, the thing that prevents them from passing through each other is electron repulsion.
If a force is pushing two objects which are being separated by electron repulsion, when that force is removed, the the objects would be pushed apart, like a spring being released.
However, that probably isn't the kind of answer the person was looking for, and the amount of push due to that, wouldn't increase the gap between you and the earth by nearly as much, as equatorial release.
first of all congratulations and thank you for your videos you are good man now my question is: the superstring theory explains that every particle and force is a result of the vibration of "mini-strings" that moves in a spacetime of more than the 3 space dimensions and the one time dimension how can this extradimensional phenomenom happen in our fourth dimensional universe?
Well, we can always look at the theoretical side, on which I can't see a problem with the idea. Once you have collected enough mass at one spot it should pull itself together into a nearly round shape. Such an amount of mass is a requiremnet by the most recent classification of planets. If it orbits around the sun as well, perfect, you've got a planet.
The problem of course is actually getting the mass. And even if there was enough, the energy required to move it all would be enormous
Well, if you know that much about our solar system, it should be no news to you that the third condition for being a planet is to have cleared it's own orbit.
Well this is an odd thought I had a while back. Say we go back to the big bang, and we go forward in time a few seconds when the first mass started forming. In these first few seconds, as the universe first began expanding, why didn't all the mass of the universe, in such close proximity, pull together at the universe's first expansion, turning the entire universe into a gigantic black hole with all mass in the universe within it.? ...
.... I try thinking this, and I'm only left with the possibility that the expansion exceeded the speed of information transmission (light speed). But that's not possible. Yet, how else could the pull of all that mass be overcome by the expansion? as that vacuum of space first formed, something had to pull greater than the gravity of all mass in the universe.
That is a very interesting question. I suppose at the beginning of the universe all the ininital matter must have been in it's own 'Schwarzschild radius' (read up on wiki). I don't think this problem has ever been adressed. I could be wrong though.
Anyways, our current model of the the development of the early universe actually does involve a period of superluminal (faster than light) expansion. It's called 'Inflation'. However this idea was introduced to solve other problems.
For some reason, a possible answer just entered my mind. Could it be that the microsecond discrepancy in time from all that mass and the lack there of mass around it could be the answer? After all, the instant mass started forming, it would bend and slow time, allowing the very outward parts of the universe to expand faster, even though it would still be bellow the speed of light, just at a faster relativity, due to the expansion causing matter to not keep up with the "border" of the universe.
Well like how mass slows time, as atomic clocks have shown in space and on earth, is it possible that this very small discrepancy in relativity would make it seem that the universe would expand faster than light for a period of time? Then, when the first mass formed, it would already be too spread out to come all together into a singular large gravity item.
This was just a random idea that I had, and I have no idea if it is plausible.
i have got a question btw.let's say im travelling on a bus and i jump while the bus is moving.would i land back on the same spot ?i have been pondering over this for so long so pls enlighten me!:)
If the bus moves at a constant speed, yes, you would land on the same spot. When you are in the bus you are actually moving at the same speed as the bus. So as you jump up and fall back down, a person on the outside would see you jump forward in the direction the bus travels.
Now, it's different when the bus is accelerating. You may have noticed getting pressed against your seat as the bus speeds up. that means the seat is accelerating you.
if you jumped at that point you might land somewhere else.
I have assumed there would be no air drag inside the bus. If you were standing on top of the bus and you jumped, the air pushing against you may well push you away.
So if you threw something up and at it's maximum height, you activated a device that could somehow create a sphere of lots of gravity around it, so much so that light couldn't get in, would it be impossible for information to reach the object so as to bring it down, and it would just float there?
I have a question, what is string theory anyway, and what is its uses, rival theories, and advantages / disadvantages to those rival theories? (provided there are any)
thanks for making these videos, they're very interesting and a nice change from most things on youtube
Well, string theory is actually quite a big topic in itself (and I don't know much about it). It's pretty much at the forefront of theoretical research.
What I do know is that it treats elementary particles (eg electrons and quarks) as vibrating 1 dimensional loops and that predicts that there are 'Branes' with different strengths of gravity (we live in one where gravity is weak).
anyways, thanks for the comment. glad you like the videos
Hey Physicist! So sorry to hear that you were ill. I hope it's not too serious and you have made a speedy recovery. All the best ! I really enjoyed episode 6 by the way as always.
Disregarding the "explosive" impact on the earth's interior, if gravity on earth were to suddenly cease and I suddenly felt myself being yanked upward into the air from the earth's crust but exercising my survival instinct clutched onto a nearby tree trunk, would I be able to clutch it with sufficient strength to survive? Would the thrust away from the earth be akin to a tornado that would tear me from the trunk. Aka, what's the resultant thrust upwards?
If there's a trunk, you should be ok. If you look at my calculation you'll see that the centripetal force due to our rotation is really not that big in comparrison to gravity.
Thank you for the answer. I also realized, I wouldn't be alive for long since the air I was breathing would float off into space as well so no point prolonging the inevitable by clutching the tree. Heh.
you put quite a bit of thought into this... i just figured that if there was no gravity we wouldn't be able to stay on the ground. i never even thought about how the earth rotates, centripetal force, the earth's core and mantle or any of that stuff lol i guess that is why i am not a physicist! nice job though, you explain everything very clearly and seem to cover all aspects of the question/theory.
Well, as the atmosphere goes, there would be much lower ambient pressure. Under this condition all water on earth would evaporate (That is of course only if it hasn't frozen previously - kinda hard to work out what happens first). So I guess all humans would 'dry freeze'.
Hi i read somewhere that in quantum mechanics if u measure something it can affect the object u have measured or the reality, it sounds abit absurd any ideas if it's true?
That's exactly the problem. you see, in order to measure something you usually have to affect the thing you're measuring in some way. for instance, if you want to know the speed of a ball, you need light to reflect of the ball so you can see it. Howver the light actully affects the motion of he ball. Now this is of cours a miniscule effect, but when it comes to tiny objects, like electrons, this is a limitation to the accuracy with which we can determine things.
i think you might have heard something wrong there. The way I see it, dark matter and dark energy affect the way the universe is expanding. So by looking at how we think the universe is expanding we can calculate how much dark matter and dark energy there might be.
I think you're thinking about this the wrong way. In science we always look for the theory that best matches observations.
In the case of the universe, the expansion theory is what best explains observations, like the redshift from other galaxies. Theoretically, we could be wrong about that theory, but then again, we could be wrong about the earth being round. There is never absolute certainty.
How would u explain that the Andromeda Galaxy is moving closer ( blueshift ) ofcourse it can if dark matter isn't spread everywhere exactly but wouldn't that cause instabillity later?
As much as I would like to be non-dogmatic,when it comes to gravity I simply can not.Gravity is property rather of matter ranther then an anergy filed of mater.Corect me if I am rong,All I know is ,where is matter there is gravity,more matter more gravity,you cant wish away gravity ,but you can overcome it by using other forces.
No, you're quite right. Well, I'm not saying gravity would ever disappear. In fact that would defy our fundamental views on physics. Consider this as a pure thought experiment.
It is to be said though, out of the fundamnetal forces, gravity is the one we understand the least.
First off, the Earth would explode!!! The range of pressure in Earth's inner core is about 330 to 360 gigapascals (3,300,000 to 3,600,000 atm) and that explosion alone would turn us into mush before we had time to enjoy a moment or two of weightlessness.
thisismyname007 1 month ago
gravity in space is only vibration in the space and time fabric, without it, then we will go in to space at 18,000 miles per hour
nicoeste8765 6 months ago
Can you make a video about relativity and the curvness of space and time? one question:
Could the densier the black hole, so the more mass it has concentrated, could the curvness of space and time be greater?
nicoeste8765 6 months ago
Excuse me ,sir. How come that people that stays in the outer space for a long time comes back in Earth-still looks the same as what they look when they left?
micanikko 1 year ago
@micanikko what do you mean by that?
ASKaPHYSICIST 1 year ago
@micanikko When someone is going fast enough, their internal clock goes slower, and they will actually age slower than you would on earth...
neveranythingtodoXD 11 months ago
@micanikko Do you mean how time slows down inside the rocket? these is because rockets that orbit the earth go at 18,000 miles per hour, so the clocks in the rockea are seconds slower than the clocks on earth, therfore the faster a rocket goes the slower the clocks, the record for going in the future is 0,2 seconds and the guy spended 728 days in outer space and yet looked as if he hadent changed.
nicoeste8765 6 months ago
My god its Agent Smith's brother ....... Tell me, Mr. Anderson... what good is a phone call... if you're unable to speak ... :)
gksypher 1 year ago 4
Great job answering such an idiotic question.
clayto1332 1 year ago
@clayto1332 lol
ASKaPHYSICIST 11 months ago
This has been flagged as spam show
Hey just had a question from my physics class I was a little confused about.
When you are moving in a circle as the earth rotates about its axis why is the centripetal direction towards the earth's axis and not the center of the earth?
jasminmaghs 1 year ago
Hey just had a question from my physics class I was a little confused about.
When you are moving in a circle as the earth rotates about its axis why is the centripetal direction towards the earth's axis and not the center of the earth?
jasminmaghs 1 year ago
@jasminmaghs as i said, the centripetal force is the force required to keep you on the ground. if your at the equator, this force is at it's maximum and points towards the centre of the earth. At the poles, the force is zero. As you move from the pole to the equator, the force will gradually increase, but it will always point towards the axis of rotation.
ASKaPHYSICIST 1 year ago
hi physicist i wanna ask u wat would the world be like without our perceptions interfering with it ? i mean without the perseptual world that our body receives and translates into real time stuff, thanx
ali1278 1 year ago
@ali1278 I don't think I understand the question. To my knowledge, our perception of the world does not change the world (at least not directly).
ASKaPHYSICIST 1 year ago
@ASKaPHYSICIST i mean that we see through our senses, its perceptual reality, maybe not objective reality, i guess asking this question would be stupid, but what exists outside our own perceptual world
ali1278 1 year ago
@ali1278
Well, are you wondering about the things that exist which we cannot perceive?
ASKaPHYSICIST 1 year ago
@ASKaPHYSICIST yes wat are they and how do they exist and do u believe in living inorganic beings ?
ali1278 1 year ago
@ali1278 Hi, i think i can make sense of your question and my answer is energy colours, our brain makes sense of energy with our senses,the colours exist of white and black in their purest forms, be broken down into red, green and Indigo as they become interfered with and split, then that is where your perceptions come in, your brain further makes sense of all these colours making the spectrum or rainbow colours. The information from the eyes makes up only 10% of what we see!
mattosx 1 year ago
what is the mystery of burmuda triangle.....
annusingh9 1 year ago
@annusingh9
If I knew, it wouldn't be a mystery
ASKaPHYSICIST 1 year ago
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what is the exact cause of gravity..........how is earths magnetic field related to gravity..............
annusingh9 1 year ago
what is the exact cause of gravity..........how is earths magnetic field related to gravity...............
annusingh9 1 year ago
@annusingh9 im not sure if this is the answer you're looking for.....but the bigger an object is in space.....the bigger gravitational pull it has.....thus the planets revolve around the sun......moons revolve around planets and so on.......but im not sure that's the answer you're looking for
myfaceispurple 1 year ago
Great video! Your exploding Earth scenario at G=0 got me thinking it would be great if you made another video about the shape of the Earth, e.g. why it's flattened and why/how it is affected by tidal forces, why the Everest is about as tall a mountain can be on Earth, etc. And if you even find a simple way to explain spherical harmonics to the layman, you're really the best ;-)
Eidolon1977 1 year ago
thanks for taking the time to make these videos, and you are great at explaining.
i feel sorry for you having to deal with idiots though, but keep on keeping on :)
thuglife666big 1 year ago
@thuglife666big thanks, I'm happy for all comments really. More videos will be coming soon hopefully.
ASKaPHYSICIST 1 year ago
hey if earth will explode in zero gravity.........why don't other planets explode
annusingh9 1 year ago
@annusingh9
everything I said applies to other planets as well.
ASKaPHYSICIST 1 year ago
Super Genius.
dreadfulweasel 1 year ago
and wat is gravity, were does it cum from originally, wats its origins and wat is it made of ?
ali1278 1 year ago
@ali1278
That's a tough one. I would like to say gravity, as we perceive it, is a result of Einstein's theory of General relativity. However, it was shown that GR is not compatible with quantum theory, so we cannot yet say for sure what the fundamental nature of gravity really is.
ASKaPHYSICIST 1 year ago
@ASKaPHYSICIST i assume it may be sum it like dark energy, but its reverse effect, sum it unknown for the time being, who knowwwws
ali1278 1 year ago
ok i have a question im not a astronaut or wat ever, but why does only earth has gravity as much and not other planets, as they have so little gravity why is that ?
ali1278 1 year ago
@glok6 Pretty much.
Although I don't see how it would be any more aimless than it is now.
ASKaPHYSICIST 1 year ago
I have a question regarding gravity. Since Moon and the Sun's gravity are responsible of the natural phenomena on earth called tide and lets say and agree that water is a form of layer on earth. Now, imagine a greater scale of planetary alignments? What happens when all planets gravities align into one singular line? Could it possibly pull a deeper layer of earth like our tectonic plates and cause drastic continental shifts and sink and rises of lands? From my logical thinking I came to this...
komodius 1 year ago
Because from my theory, the core of earth is super compressed and the outer layer is pressing against the core, and from that friction of minerals create energy and also generates magnetic field (and gravity towards center earth). Now, alignment of all other planets gravity could possibly grab earth's surface from much deeper layer like i mentioned earlier about tectonic plates. Do you think this is what we will experience during galactical scale alignments?
komodius 1 year ago
My idea is anything that exists have its influence to its surroundings, and the existence of gravitational relation is like a contract between the two or more, and the rules applied can differ depending on the participants (planets, comets etc..). An example sample question would be, could other planets gravity have effects on our weight on earth? Or it doesn't need to be human mass but anything that can have its weight measured. what do you think of that?
p.s. i enjoy your video.
PEACE
komodius 1 year ago
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"it was my understanding the 7 frames per second was the recording speed for videos as well, which would have been inadequate. A simple misunderstanding ... you retarded anal whore." interesting comment from a 'scientist'. not very astute at observing. also quite vulgar and with the haircut of a pedophile.
mentalmetal1 1 year ago
This has been flagged as spam show
"it was my understanding the 7 frames per second was the recording speed for videos as well, which would have been inadequate. A simple misunderstanding ... you retarded anal whore." interesting comment from a 'scientist'. not very astute at observing. also quite vulgar and incredibly dorky looking.
mentalmetal1 1 year ago
your voice is the funniest part of the vid
xxMrMikeyxx 1 year ago
What force is expanding space and how is it overpowering the gravitational effects of things like supermassive black holes? Or do some parts of the universe remain stationary while everything around them expands?
TheUnparagonedChris 2 years ago
I think you're referring to what is known as 'Dark Energy' or the term in the equation for the expansion of the universe known as the 'cosmological constant'.
I can't really tell you much about it, but while we would expect the matter in the universe to fall back on itself due to gravitational decceleration, it is actually causing it to accelerate away. I'll talk more about it in my next episode.
ASKaPHYSICIST 2 years ago
planets with no moons wobble out of control.. come on bro, that's basic stuff. if never learned that, don't reply.
12GaugeLosAngeles 2 years ago
If you have learned it and you understand it you should have nbo problem expalining it.
I'm afraid you're wrong though.
ASKaPHYSICIST 2 years ago
I like what ur doin with these videos. Will things get a little more in depth in the future? Maybe like nonlocal properties or something similar?
krazykris317 2 years ago
The other day, I had a lengthy discussion with my mother, where she argued that the gravitational effect of the moon may affect human behaviour (this is a widespread belief). I argued that the g forces that act on us when for example, jumping or moving, are much more significant then the force exerced on us by the moon, and that this is evidence that the gravity of the moon has no real behavioral effect on us. Am i right in this reasoning? Are gforces essentially the same as "moon gravity"?
Trubadidudei 2 years ago
hmm, the moon does change the tides.
well, the moon has a gravitational pull on us. not nearly as strong as that of the earth, but i guess it could affect us in ways. of course jumping and moving produces stronger acceleration effcts, but you couldn't deny that they are always linked to our behaviour, so how is that a counter argument?
I do hear that the position of the moon is some how linked to child birth ... like tides in one's amniotic fluid. I dont think there concrete studies thouh
ASKaPHYSICIST 2 years ago
IT HAS BEEN PROVEN THAT the moon alters alot of activity, cause humans evolved using the moon as light to help hunt at night. The moon is a considerable part of life on Earth, since with out the moon, the Earth would wobble like crazy and NOT spin on it's axis, so it's basic common sense the moon has more than just gravitational effect hundreds of thousands, maybe even millions of years ago. No moon, maybe no life on Earth.... the temperature fluctuations would be to harsh to hold life...
12GaugeLosAngeles 2 years ago
You may have a point about the light, but what gives you the idea about the wobble?
In any case, harsg temperature fluctuations... I dont think so.
ASKaPHYSICIST 2 years ago
@ASKaPHYSICIST : the moon is just a small object buzzing around the earth. Sure, its been around for very long years and sure it must have given some influence to the way earth may have span but at what % of influence? Earth would naturally fix its self even though your theory of wobble was correct because if the earth is like a gyroscope, the wheel is still spinning inside earth which would help balance its self again.
komodius 1 year ago
No, not really, this has not been proven.
I presume you're talking about the "full moon effect", which presumes that peope display agressive behaviour more frequently under a full moon.
If this indeed that, the no, that is absolutely not proven. In fact, there is no scientific evidence that makes a strong case for this effect. There are some studies that "suggests" that it may exist, and there are even more that suggest it doesn't.
So, to sum up: Far from proven, still a myth.
Trubadidudei 2 years ago
if u require u have three body 1- car 2-man 3-building
HawlerBOSS 2 years ago
What happen if earth rotation will shutdown?
Michanicaly what happen 2 each body if u know speed each body in equator zone is 400m/s approximatily!!!
HawlerBOSS 2 years ago
without gravity then earth and ocean will fall up sky become evaportor
krbldwn 2 years ago
Are there any planets or stars where centripetal force is greater than gravitational force i.e g > v^2/R. What happens if g = v^2/R??
And 1 hard question. How much time would be needed for the atmospheric particles to go away and in how much time the person on the north pole would feel to wear the breath mask?
Also, what are the factors determining the time required for the Earth to explode if gravity suddenly disappears? Is it its mass?
godfather755 2 years ago
Actually, even if you were standing on the rotational axis, you would still inevitably drift away.
This is due to the fact that all mater has a certain degree of compactability.
If you think about it even from the scale of atoms, the thing that prevents them from passing through each other is electron repulsion.
If a force is pushing two objects which are being separated by electron repulsion, when that force is removed, the the objects would be pushed apart, like a spring being released.
TheReasonWhyGuy 2 years ago
However, that probably isn't the kind of answer the person was looking for, and the amount of push due to that, wouldn't increase the gap between you and the earth by nearly as much, as equatorial release.
TheReasonWhyGuy 2 years ago
so if the world stoped spinning there would be no way to tell time...sweeet
2J8O4S6H9 2 years ago
first of all congratulations and thank you for your videos you are good man now my question is: the superstring theory explains that every particle and force is a result of the vibration of "mini-strings" that moves in a spacetime of more than the 3 space dimensions and the one time dimension how can this extradimensional phenomenom happen in our fourth dimensional universe?
FireSkullGun 2 years ago
is it possible to travel through a solid object like metal if you send vibrations throughthe metal
gamer8793 2 years ago
that would be news to me. i wouldn't recommend you try.
ASKaPHYSICIST 2 years ago
lol
godfather755 2 years ago
yea but that would be a way to be constructive with being destructive and we can well pull other things in too to make it bigger..
cricketol 2 years ago
would you think that there would be a way to take the asteroid belt and make a new planet from it
cricketol 2 years ago
There's less than 4% of Earth's MOON'S mass in all of those asteroids put together. It'd be one puny planet.
JosephStrang 2 years ago
Well, we can always look at the theoretical side, on which I can't see a problem with the idea. Once you have collected enough mass at one spot it should pull itself together into a nearly round shape. Such an amount of mass is a requiremnet by the most recent classification of planets. If it orbits around the sun as well, perfect, you've got a planet.
The problem of course is actually getting the mass. And even if there was enough, the energy required to move it all would be enormous
ASKaPHYSICIST 2 years ago
There's already a round asteroid: Ceres. It's mass is just large enough to pull it into a sphere. It's 33% of the belt's mass.
JosephStrang 2 years ago
Well, if you know that much about our solar system, it should be no news to you that the third condition for being a planet is to have cleared it's own orbit.
ASKaPHYSICIST 2 years ago
I didn't say it was a planet. Ceres is currently classified as a dwarf planet, much like Pluto and Eris.
JosephStrang 2 years ago
i didn't say you did.Thanks for the comments.
ASKaPHYSICIST 2 years ago
No problem.
JosephStrang 2 years ago
Can you move faster than light?
Destroyer670 2 years ago
apparently not.
ASKaPHYSICIST 2 years ago
if the earth came to a stop will there be gravity?
edith6363 2 years ago
why wouldn't there be gravity?
ASKaPHYSICIST 2 years ago
are your upcoming videos nigh?
vanboevans 2 years ago
well, they ain't too far. I'm working at them.
ASKaPHYSICIST 2 years ago
never knew the absence of gravity was that dangerous....
gax908 2 years ago
well, you should keep in mind, it is one of the fundamentral forces. without it the universe as we know it would never have formed.
ASKaPHYSICIST 2 years ago
Well this is an odd thought I had a while back. Say we go back to the big bang, and we go forward in time a few seconds when the first mass started forming. In these first few seconds, as the universe first began expanding, why didn't all the mass of the universe, in such close proximity, pull together at the universe's first expansion, turning the entire universe into a gigantic black hole with all mass in the universe within it.? ...
Gormanmod 2 years ago
.... I try thinking this, and I'm only left with the possibility that the expansion exceeded the speed of information transmission (light speed). But that's not possible. Yet, how else could the pull of all that mass be overcome by the expansion? as that vacuum of space first formed, something had to pull greater than the gravity of all mass in the universe.
Gormanmod 2 years ago
That is a very interesting question. I suppose at the beginning of the universe all the ininital matter must have been in it's own 'Schwarzschild radius' (read up on wiki). I don't think this problem has ever been adressed. I could be wrong though.
Anyways, our current model of the the development of the early universe actually does involve a period of superluminal (faster than light) expansion. It's called 'Inflation'. However this idea was introduced to solve other problems.
ASKaPHYSICIST 2 years ago
thanks for the info.
I personally saw no other alternative than faster than light expansion. I will read up on that. thanks.
Gormanmod 2 years ago
No, you're quite right in thinking that. I think it's a very insightful question really. I'll try to find out more
ASKaPHYSICIST 2 years ago
For some reason, a possible answer just entered my mind. Could it be that the microsecond discrepancy in time from all that mass and the lack there of mass around it could be the answer? After all, the instant mass started forming, it would bend and slow time, allowing the very outward parts of the universe to expand faster, even though it would still be bellow the speed of light, just at a faster relativity, due to the expansion causing matter to not keep up with the "border" of the universe.
Gormanmod 2 years ago
Sorry, you lost me there. What microsecond discrepancy?
ASKaPHYSICIST 2 years ago
Well like how mass slows time, as atomic clocks have shown in space and on earth, is it possible that this very small discrepancy in relativity would make it seem that the universe would expand faster than light for a period of time? Then, when the first mass formed, it would already be too spread out to come all together into a singular large gravity item.
This was just a random idea that I had, and I have no idea if it is plausible.
Gormanmod 2 years ago
hey!very informative!
i have got a question btw.let's say im travelling on a bus and i jump while the bus is moving.would i land back on the same spot ?i have been pondering over this for so long so pls enlighten me!:)
shameer0815 2 years ago
That's a very good question. The aswer:
If the bus moves at a constant speed, yes, you would land on the same spot. When you are in the bus you are actually moving at the same speed as the bus. So as you jump up and fall back down, a person on the outside would see you jump forward in the direction the bus travels.
Now, it's different when the bus is accelerating. You may have noticed getting pressed against your seat as the bus speeds up. that means the seat is accelerating you.
ASKaPHYSICIST 2 years ago
if you jumped at that point you might land somewhere else.
I have assumed there would be no air drag inside the bus. If you were standing on top of the bus and you jumped, the air pushing against you may well push you away.
ASKaPHYSICIST 2 years ago
So if you threw something up and at it's maximum height, you activated a device that could somehow create a sphere of lots of gravity around it, so much so that light couldn't get in, would it be impossible for information to reach the object so as to bring it down, and it would just float there?
Gormanmod 2 years ago
Comment removed
Gormanmod 2 years ago
I have a question, what is string theory anyway, and what is its uses, rival theories, and advantages / disadvantages to those rival theories? (provided there are any)
thanks for making these videos, they're very interesting and a nice change from most things on youtube
questionsleep9 2 years ago
Well, string theory is actually quite a big topic in itself (and I don't know much about it). It's pretty much at the forefront of theoretical research.
What I do know is that it treats elementary particles (eg electrons and quarks) as vibrating 1 dimensional loops and that predicts that there are 'Branes' with different strengths of gravity (we live in one where gravity is weak).
anyways, thanks for the comment. glad you like the videos
ASKaPHYSICIST 2 years ago
Hey Physicist! So sorry to hear that you were ill. I hope it's not too serious and you have made a speedy recovery. All the best ! I really enjoyed episode 6 by the way as always.
monkeysnatch1 2 years ago
Thanks man, but i'm fine now. No worries.
ASKaPHYSICIST 2 years ago
Thanks again for your awesome videos.
Disregarding the "explosive" impact on the earth's interior, if gravity on earth were to suddenly cease and I suddenly felt myself being yanked upward into the air from the earth's crust but exercising my survival instinct clutched onto a nearby tree trunk, would I be able to clutch it with sufficient strength to survive? Would the thrust away from the earth be akin to a tornado that would tear me from the trunk. Aka, what's the resultant thrust upwards?
sirmolio 2 years ago
If there's a trunk, you should be ok. If you look at my calculation you'll see that the centripetal force due to our rotation is really not that big in comparrison to gravity.
ASKaPHYSICIST 2 years ago
Thank you for the answer. I also realized, I wouldn't be alive for long since the air I was breathing would float off into space as well so no point prolonging the inevitable by clutching the tree. Heh.
sirmolio 2 years ago
you put quite a bit of thought into this... i just figured that if there was no gravity we wouldn't be able to stay on the ground. i never even thought about how the earth rotates, centripetal force, the earth's core and mantle or any of that stuff lol i guess that is why i am not a physicist! nice job though, you explain everything very clearly and seem to cover all aspects of the question/theory.
ChicagoCubs1060 2 years ago
Well, I thought, while I'm at it, I might as well cover it thoroughly. Anyways, I'm glad you found the video helpful.
ASKaPHYSICIST 2 years ago
hey thanks a lot for making this video! it was very interesting.
ChicagoCubs1060 2 years ago
lol always wondered what life would be like without gravity thanks :P
TheRealBeeQue 2 years ago
What do you believe to be the most likely way the earth and or life on earth will be destroyed?
vanboevans 2 years ago
hmm, I couldn't think of anything particularly realistic.
However, we may well destroy a lot of animal, human and plant life if we don't do something about climate change in the near future.
ASKaPHYSICIST 2 years ago
Kwl vid
can't wait until ep 7
also would this mean the surface of the earth would be a vacuum, so what effect would it have on human body (other than suffication)
LittleMissNoFace 2 years ago
Well, as the atmosphere goes, there would be much lower ambient pressure. Under this condition all water on earth would evaporate (That is of course only if it hasn't frozen previously - kinda hard to work out what happens first). So I guess all humans would 'dry freeze'.
Anyways, glad you like the video.
ASKaPHYSICIST 2 years ago
Is there any way or any experiment to determine what would happen first? lol
godfather755 2 years ago
Hi i read somewhere that in quantum mechanics if u measure something it can affect the object u have measured or the reality, it sounds abit absurd any ideas if it's true?
dqds 2 years ago
That's exactly the problem. you see, in order to measure something you usually have to affect the thing you're measuring in some way. for instance, if you want to know the speed of a ball, you need light to reflect of the ball so you can see it. Howver the light actully affects the motion of he ball. Now this is of cours a miniscule effect, but when it comes to tiny objects, like electrons, this is a limitation to the accuracy with which we can determine things.
ASKaPHYSICIST 2 years ago
Thanks, it's because i heard expansion of the universe might have been affected by human by measuring the dark matter or in 1988 or something.
dqds 2 years ago
i think you might have heard something wrong there. The way I see it, dark matter and dark energy affect the way the universe is expanding. So by looking at how we think the universe is expanding we can calculate how much dark matter and dark energy there might be.
ASKaPHYSICIST 2 years ago
Aha okay, but by the way is there a possibility that the universe isn't expanding and scientists are wrong? Btw great vids very interesting =)
dqds 2 years ago
I think you're thinking about this the wrong way. In science we always look for the theory that best matches observations.
In the case of the universe, the expansion theory is what best explains observations, like the redshift from other galaxies. Theoretically, we could be wrong about that theory, but then again, we could be wrong about the earth being round. There is never absolute certainty.
ASKaPHYSICIST 2 years ago
How would u explain that the Andromeda Galaxy is moving closer ( blueshift ) ofcourse it can if dark matter isn't spread everywhere exactly but wouldn't that cause instabillity later?
dqds 2 years ago
so if universe is expanding that means that it is finite and it is not infinite right?
godfather755 2 years ago
good vid cant wait till 7
canascot 2 years ago
As much as I would like to be non-dogmatic,when it comes to gravity I simply can not.Gravity is property rather of matter ranther then an anergy filed of mater.Corect me if I am rong,All I know is ,where is matter there is gravity,more matter more gravity,you cant wish away gravity ,but you can overcome it by using other forces.
VirPax 2 years ago
No, you're quite right. Well, I'm not saying gravity would ever disappear. In fact that would defy our fundamental views on physics. Consider this as a pure thought experiment.
It is to be said though, out of the fundamnetal forces, gravity is the one we understand the least.
ASKaPHYSICIST 2 years ago
So if the earth had no gravity the moon would also escape ?
CRESENT67345 2 years ago
pretty much, yea
WitchCount 2 years ago
yeah kind of a stupid questionlol
CRESENT67345 2 years ago