- Видео 12
- Просмотров 16 364
David Shlivko
Добавлен 10 июл 2013
How String Theory can guide our search for Dark Energy
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This video was created for Princeton Research Day 2023.
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Over the past century, astronomical observations have taught us that the observable universe-that is, the fabric of space itself-is expanding. For most of the universe's 14-billion-year history, this expansion has coincided with an expanding "Hubble horizon," which is a measure of how deep into space one can theoretically see. More recently, however, this Hubble horizon has been growing more slowly and ...
This video was created for Princeton Research Day 2023.
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Over the past century, astronomical observations have taught us that the observable universe-that is, the fabric of space itself-is expanding. For most of the universe's 14-billion-year history, this expansion has coincided with an expanding "Hubble horizon," which is a measure of how deep into space one can theoretically see. More recently, however, this Hubble horizon has been growing more slowly and ...
Просмотров: 90
Видео
How Inflation Makes a Curved Universe Look Flat
Просмотров 9223 года назад
Contact email: dshlivko@princeton.edu This short video is my submission to the #VeritasiumContest - it’s for those of you who have heard of inflation and the “flatness problem” of cosmology but want a more proper explanation of their connection than is usually presented.
The Big Bang ISN'T what you think it is.
Просмотров 2864 года назад
The Big Bang makes it sound like the universe began with an awesome explosion-but just how much do we actually know about its early days? Disclaimer: This video is my own production, and the content is not meant to represent official views of Caltech.
Plasma and Paschen's Curve
Просмотров 8 тыс.8 лет назад
Watch in High Definition with high volume for best experience! Have you ever wondered what exactly plasma is? In this video, we explore the depths of this "fourth state of matter," delve into creating plasmas artificially, and learn about the numerous applications of plasma in modern science and technology. (Submission for the 2015 Breakthrough Junior Challenge competition) Sources (information...
Why Does Vanilla Smell So Good (But Extract Taste So Bad)?
Просмотров 2,5 тыс.8 лет назад
Have you ever wondered why vanilla, of all things, smells so amazing, or why pure vanilla extract has such an unexpected taste? Watch to learn about what vanilla is and why it has these unique characteristics! Sources: theplate.nationalgeographic.com/2014/10/23/plain-vanilla/ www.bulletproofexec.com/using-vanilla-to-increase-your-mental-performance/ www.sfgate.com/food/article/What-Makes-Vanill...
Let’s Talk Physics ep. 5: Conservation of Energy & Rotational Kinematics
Просмотров 9679 лет назад
Lagrangian method explained here: ruclips.net/video/2mUFwAS3BOY/видео.htmlm59s Hey everyone! I’ve decided to take some physics problems to RUclips - because I like physics, I like making videos, and just maybe these can be useful to some of you. Today, we take a look at what happens when a sphere is released from rest in a hemispherical, perfectly rigid bowl. In particular, we use two different...
Let’s Talk Physics ep. 4: Static Equilibrium & Advanced Dynamics
Просмотров 5999 лет назад
Watch in 720p for a better experience! Lagrangian method explained here: ruclips.net/video/2mUFwAS3BOY/видео.htmlm59s Hey everyone! I’ve decided to take some physics problems to RUclips - because I like physics, I like making videos, and just maybe these can be useful to some of you. Today, we first examine a system in equilibrium, and then transition into a dynamics problem, which requires tha...
Let’s Talk Physics ep. 3 extension: Real Mass on a Slide
Просмотров 959 лет назад
Velocity equation derived in episode 3: ruclips.net/video/ClsQyhozF5U/видео.html Hey everyone! I’ve decided to take some physics problems to RUclips - because I like physics, I like making videos, and just maybe these can be useful to some of you. Today, we have a special addendum to episode 3 that examines a theoretical question we asked in real life, comparing predicted results to experimenta...
Let's Talk Physics ep. 3: Mass on a (Curved) Slide
Просмотров 1579 лет назад
First things first: I know the video goes through some calculations pretty quickly, so if you want to appreciate the math behind all this, feel free to pause and examine :) Assumption derived in episode 1: ruclips.net/video/2mUFwAS3BOY/видео.html Hey everyone! I’ve decided to take some physics problems to RUclips - because I like physics, I like making videos, and just maybe these can be useful...
Let's Talk Physics ep. 2: Pulley System
Просмотров 1569 лет назад
Notation explained in episode 1: ruclips.net/video/2mUFwAS3BOY/видео.html Hey everyone! I’ve decided to take some physics problems to RUclips - because I like physics, I like making videos, and just maybe these can be useful to some of you. At least for now, we’re going to focus on dynamics problems, which basically ask how an object will move in a given scenario, or with some given forces acti...
Let’s Talk Physics ep. 1: Mass on a Ramp
Просмотров 999 лет назад
Derivation of angle equivalence: math.stackexchange.com/questions/268915/why-are-these-angles-equal-for-object-on-inclined-plane Hey everyone! I’ve decided to take some physics problems to RUclips - because I like physics, I like making videos, and just maybe these can be useful to some of you. At least for now, we’re going to focus on dynamics problems, which basically ask how an object will m...
Newton vs. Huygens: The Nature of Light
Просмотров 2,7 тыс.10 лет назад
A mix between a rap battle and debate between Isaac Newton and his corpuscular theory of light and Christiaan Huygens and his wave model - with special guest Louis de Broglie! Lyrics: docs.google.com/document/d/1-eXiNJeCfEaZ1IHplrHN_oDvZw89dYFhjz-LCctzsn0/pub
Newton knew about the PE effect??
Well explained, although I have a question. Why is there even a flatness problem? Isn't the anthropic principal enough? Looking forward to learn more from you
Whether or not there is a flatness problem to begin with isn't something everybody agrees on - there are measures under which perfect flatness is natural and expected in a homogeneous universe, but to my knowledge this argument has not been broadly adopted within the standard lore/textbooks/courses. I don't think that the flatness we've observed is something that can be argued away through anthropic reasoning, either, unless you can think of compelling reasons that life couldn't exist in curved space.
@@davidshlivko9594 does matter and energy distribution of the universe depend on curvature of universe?
Good presentation, it reminds me of Veritasium. If you could add a n animation that illustrates your point it would be easier to grasp what you are saying.
Great video thanks
Very good video.
Clickbait. was looking for a bang :(
So GOOD!!!! Thanks for teaching me about the big bang!!!
you look like youre trying way to hard to be the guy from PBS Spacetime
he's my idol, what can i say
He IS the guy from PBS spacetime
Thank you sir It is more interesting
majestic
first comment
first comment
Sir can we balance centrifugal force also
lol delete this
Wait so kids have access to 35% alcohol?
TheHybridNarwhal Essentially, yes - the regulations on alcohol make an exception for extracts literally on the basis of them being too distasteful for a reasonable person to consume!
@@davidshlivko9594 Thinking about that time I downed a whole bottle as a kid now…
555 views
Lol now i know
Hi! Could you send me the lyrics? I would be grateful forever, guys!
Thanks for the idea - I added a link to the lyrics in the description of the video. Remember to use them responsibly and cite where needed :)
@@davidshlivko9594 my physics teacher said If I write the whole lyrics for a question in my exam hell give me 8 marks for a 7 marker, reckon I can memorise em in a day?
I think the hard part would be writing it all down within the time frame of the exam!
@bkboggy I should've probably specified this, but I'm using vector quantities (rather than magnitudes of forces) to make Newton's 2nd Law an actual sum.
You said ΣFy = T1 + Fg = m1*a. That's wrong. Tension and weight are opposites of each other in this scenario. It should be ΣFy = T1 - Fg = m1*a or ΣFy = Fg - T1 = m1*a, depending on your coordinate system (whether down or up is positive).