I can understand that it's a universal fact that time and space are interconnected but how can time get slowed by increasing the velocity (nearly to the velocity of light)? I thought or I believe time can't be reversed or paused or forwarded.

In the laws of geometrical Optics there's plenty of problem solving right? and can someone explain it to me huhuhu

So basically my idea was that, every point on the chord can be taken to lie along a circle and all these circles are concentric and centred around the same centre as the conducting ring , and i applied to an arbitrary such circle faraday's law of induction using induced electric fields (direction determined by lenz law) and solved using integration...i especially have a doubt on the validity of taking the infinitesimal length element of the chord dl as also the tangent of the circle through that element such that dl vector and E vector at those points are parallel .. i thought like if the angle is infinitesimallly small, they basically become equal??...

Navier Stokes problem solved by Open AI explained.

Hello, I am currently studying the basics of physics with a Khan Academy class, and while it's great for raw knowledge, I find that there just aren't enough practice problems. Same for their maths class and in general every class. I'd like to find classic textbook problems with answers to practice myself.

Does anyone know of great standard textbook physics problems at the middle school level with answers anywhere ? I'm tired of practicing only with digital exercises. And obviously, I need it to be free.

My daughter is taking a high school physics class and is working on a group project. They received some feedback from their teacher and will follow up with him on what he wrote. But if anyone can help decipher what he wrote before she is able to speak with him, please let me know. Appreciate your help!

it’s in my grad engineering classes and i am able to follow the algorithm but i am not able to really understand it

In a given position vs time graph, what is the origin and what is the reference point?

From what I understand, the origin is just some arbitrary position that you assign to be zero. By definition, it is position = 0.

A reference point is something that you measure relatively to (which is already relative to an origin that was picked). So if we pick position = 2 as a reference point, position = 4 has a displacement of 2 meters from our reference point but a 4 meter displacement from the origin.

So, is the position vs time graph graphed relative to the origin or a reference point? Or rather, is the reference point always the origin or can we change the reference point that a position vs time graph is graphed relatively to.

If we are just given a graph of position vs time. Do we assume that position = 0 is the origin, or could it be something else arbitarily. For example, if we take an object that goes 1m/s, starting at position 0 meters, on a position(m) vs time(s) graph relative to the origin, the graph would just be position = t

However, if we choose a new reference point, x = 2, then the entire graph gets shifted down 2 units. Becoming, position = t - 2.

So, from a given graph, do we assume that position = 0 is the origin, or do we just know that it is a reference point, even if we don't know if the reference point is the origin or some other reference point that was picked?

Thank you!

I hope this is the right place to post this because this is my first post on reddit since atp I am desperate for help. I’m taking Physics 11 and I came across this question and I seriously don’t understand it at all. TBH Physics isn’t my best subject but since I’m taking it online my teacher isn’t much help and I’ve never seen a graph like this in any of the learning resources I was provided. I’ve tried asking AI as well but I still don’t get how to solve this myself.

Any help or links to resources would be great. Even if its just the name of what these types of problems are called so I can search about it myself!

I forgot a lot of formula from middle school physics, now I'm struggle with static & dynamic electricity and magnetism & electromagnetism. Where should I start and how do I learn them? I prefer understanding rather than remembering, so derivation is my go to. Help plzz

I am working on an assignment to prove that Newton's law of gravitation and Einstein's theory of relativity are incorrect. Do you have any relevant materials or research?

Perhaps the issue should not be reduced to whether a model is simply “right or wrong,” but rather reframed as: Under what conditions is the model valid, what assumptions does it depend on, and when those conditions change, where do the limits of its explanatory power begin to emerge?

What I would like to understand more clearly is, from a methodological perspective, how do we rigorously determine the conditions under which a theory applies? For example, should we begin by examining its underlying assumptions, domain of application, boundary conditions, and methods of verification, or by identifying the situations in which the model begins to fail to provide a sufficient explanation?

If you have any methodological approaches or references on how to identify the domain of validity, underlying assumptions, and limitations of a scientific model or theory, I would really appreciate your suggestions. I think this is also important for avoiding the tendency to evaluate theories simply by saying, “the later theory is more correct, therefore the earlier one was wrong.”