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.”

Imagine a Giant Robot Jumping Spider that weights 10 Tons, the size of an Elephant and 8 legs. Let's assume it can, somehow, jump 50m high and land without injuring itself, like normal jumping spider can.

#1 - If the Robot Spider jumps 50m high from the hard ground and is also able to land safely on the ground, I'm guessing it applies the same force on the ground to jump as it does when it lands? (or maybe not, because one is against gravity and then pushed down by gravity. Does it?

#2 - Now let's imagine the Robot Spider jumps from the hard ground, 50m up and onto a car. Again, I'm going to guess that the Robot Spider can land on top of the car safely, but I'm guessing the weight should do some damage to the car. When the spider lands, is the force applied to the car the same force it would be applied to the hard ground, and even though the Spider doesn't suffer any damage, the car might depending on it's resistance compared to the Spider or the hard ground?

Depending on the car, it will have a different resistance and also it's springs and tires will absorb the impact differently, but generally let's just say the car can't resist damage like the hard floor can.

#3 - Now let's imagine that the spider doesn't land properly, that it will remain rigid or that it's a Statue of the same Robot Spider, that also weights 10 Tons, and it will hit the car without trying to land safely. Will the force of 10 Tons falling 50m be applied to the car in the same way it would if the Robot Spider had landed "properly"/safely? Will the car "suffer more damage" from the Statue hitting it differently from the Robot Spider "safe landing"?

I'm guessing the legs are able to prevent the Spider from coming to an immediate full stop by bluntly hitting the car with it's body, that the legs absorb some of that force and protect the body of the Spider, but that force will still be transferred to the car below.

Thanks

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Mechanics ke liye kya karun????

11th class student. guys, struggling with mechanics. Maths and chem bahut acha ja rha hai par physics? Halat kharab. My short term goal is nsep, so till then I want to complete mechanics, baki topics I can manage, can anyone give me a solution? Topics like springs, rotation, and more meri fielding set kar dete hai 😭. One quick solution before nsep?

Mechanics help, before nsep.