What specifically is it about Einstein's theories that we know doesn't work, and why? I mean I understand that we can't really know the insides of a black hole, but why does that mean the physics break?
Since there are no light engines I'm assuming it doesn't work, but theoretically it should be possible.
Let's say, hypothetically, you could shrink a non regulation cannonball (in size and weight) to the size of a musketball and grow it at will. The volume of the cannonball is 4000x the volume of the musket ball (square cube law tells me that a cube of size change would have the s.a. of one size as 225x larger). If I grew the "bullet" as soon as I fired it, obviously it would slow faster after it grew, but how much faster? For the sake of variables, assume the bullet fires at 500ft/s and is transformed into the 4000x volume cannonball at 1ft
i dont care about anything other than the fusion part because why is it called fusion? i got one answer that says fusion refers to both the forward and backwards change of state between solid and liquid, although i would like to fact check that in some way. especially since that would imply vaporization refers to both changes of state between gas and liquid due to specific latent heat of vaporization, but calling condensation vaporization feels very wrong
Basically what the title says
I had this thought about an air pocket at the bottom of a vase-like shape that goes into water.
If you were able to maintain the air pocket, wouldn’t the weight of the water overcome the air pressure, creating continuous flow?
From the last section ("Gravity and relativity") of the The Theory of Gravitation piece of Six easy pieces:
>One feature of this new law which is quite easy to understand is this: In the Einstein relativity theory, anything which has energy has mass -- mass in the sense that it is attracted gravitationally. Even light, which has an energy, has a "mass." When a light beam, which has energy in it, comes past the sun there is an attraction on it by the sun. Thus the light does not go straight, but is deflected.
I always thought that light has no mass and that its energy derives from momentum, according to the extended version of Einstein's mass-energy equivalence, and that light is "attracted" by celestial bodies because the energy of massive objects warps spacetime; and so, from the light's perspective, its traveling in a straight line, but in reality, the spatial geometry that is going thru is curved. Why does Feynman explain it that way? Wasn't he a leading expert on general relativity?
Edit:
Thanks for the replies; my confusion mainly arised from the translation of the text, which omits quotation marks and phrases things much more ambiguously. (i took the quote above from a random free pdf online)
I remember seeing somewhere that monopoles weren’t possible, so if I did what was said in the title what exactly would happen?
Would the magnets stop being magnets? Would one side become the opposite polarity to balance it?
I have a bachelor in physics and i need to know if it s worth it to do a bachelor in engineering so i could do masters that will help get a job and stable income later in life. Especially that with a physics degree only i can mostly work in teaching and i am starting to feel that doing a phd is harder than i thought, since i am doing my first year in fundamental physics masters and struggling a lot. Is anyone else struggling with physics like me ? And should i think about a bridging program to an engineering bachelor ( like biomedical or electrical) ?
like in dr strange when his time has passed for a couple of hundreds years but not a second on earth had passed
need this for my fiction-
It seems to me that General Relativity is accepted at this point, even in the case of Quantum Mechanics, and my understanding is that GR establishes that gravity isn't a force but just an observed effect of curved space-time. Why, then, is a gravity boson necessary at all? If we have a mediating particle for the 3 fundamental forces that are actually forces, doesn't it make sense that the reason we haven't found the graviton is because it doesn't exist because there's no force for it to mediate?
I don't really know how to ask this question, so please bear with me.
If you have a container that is open to the atmosphere on top and open a drain on the bottom (such as a bath tub) in what order does the water flow out? (Does the bottom water flow out before the rest? Does the water just flow down?)
I know this is a probably a complex answer, so feel free to simply it for me. This is just something I am curious about.
I appreciate the help. I don't know how to phrase the question to be able to google it.
And is that the minimum required amount of power to protect Earth from as many kinds of radiation as it does?
So i was deriving velocity for simple harmonic motion and in the process of deriving, I first need to differentiate displacement with respect to time.
Now displacement y= rsin(wt). Where r= radius, w=angular frequency and t= time.
So what exactly is w(omega) . It is said to be angular frequency but i just don't understand its concept. Like how did we derive it especially from the graph.
This is the graph my tutor gave me.
For context, I'm an undergraduate student in physics. We just started our Quantum Mechanics course. After class, I went through the 'Introduction to Quantum Mechanics' textbook by Griffiths and encountered the reduced planck's constant in the Schrodinger's equation.
If it's equal to h/2pi, wouldn't it make sense to just write that?
Idk, I'm new to this, so I don't get it yet
I remember seeing somewhere that monopoles weren’t possible, so if I did what was said in the title what exactly would happen?
Would the magnets stop being magnets? Would one side become the opposite polarity to balance it?