Questions tagged [laws-of-physics]

DO NOT USE THIS TAG just because the question deals with a law of physics!

Filter by
Sorted by
Tagged with
1
vote
0answers
27 views

Consistency in the laws of physics [duplicate]

When I read about past events in the universe (i.e. big bang, formation of the sun and planets, etc) future events (i.e. sun becoming a red giant) and distant objects (black holes, nebulas, galaxies, ...
1
vote
0answers
47 views

Why are squares, square-roots, and second-order differentials, common in natural laws, but not cubes, cube-roots, and higher order effects? [duplicate]

Natural laws often feature squares and square roots, and second-order differential equations. Cubic laws, cube-roots, and third-order differentials are fairly rare. (Some counter-examples: square-...
1
vote
2answers
46 views

A Newton's third law confusion

Suppose you have a bird inside of a glass cage with some amount of gas inside it. We now place this cage on a weighing scale and observe its readings in different situations. Case (1): when the bird ...
1
vote
2answers
55 views

Explain how scaling of the inverse square law breaks down at a stars surface

If the radiation pressure at distance $d>R$ from the center of an isotropic black body star is found to be $$P_{rad}=\large{\frac{4\sigma T^4}{3c}}\left[1-\left(1-\frac{R^2}{d^2}\right)^{\frac{3}{2}...
5
votes
1answer
173 views

Laws of Physics [closed]

Here is a thought. Let us assume the there is an infinite uni-directional line of balls. And it is being jumbled up again and again, randomly. (say by 'God'!) I in my limited experience/capacity can ...
-1
votes
2answers
87 views

Is there any different model for universe which can create life?

I am an undergraduate student. I am not good at physics at all, but I interested to understand the physics. We know, our universe has four forces (there can be more than four) and some laws. And laws, ...
1
vote
0answers
51 views

Are there any physics equations that involve exponents >= 5? [duplicate]

This might be a strange physics question, but I am curious about it. Are there any physics equations that involve exponents $\geq$ 5? There are plenty of equations with square exponents. Inverse ...
7
votes
3answers
343 views

Is Newton's third law a consequence of first and second law?

Refer to the diagram shown above Question Assume a system of two objects ($1$ and $2$) which are applying force on one another ($F_{12}$ and $F_{21}$), which can be zero, (read $F_{12}$ as force on ...
1
vote
3answers
102 views

Why transcendental terms in the laws of nature are dimensionless?

Through my years in nuclear engineering, it has always been the case that in physical relations, the arguments of transcendental functions, e.g., the exponential in the law of radioactive decay, $N=...
1
vote
3answers
135 views

The first postulate in special relativity

In Einstein's special relativity, there are two postulates: 1. the laws of physics are invariant in all inertial frames of references; and 2. the speed of light in a vacuum is the same for all ...
1
vote
1answer
58 views

What did Stephen Hawking mean with “not demanded by logic or physical principle”?

In his book, "The Grand Design", physicist Stephen Hawking said: "It appears that the fundamental numbers, and even the form, of the apparent laws of nature are not demanded by logic or physical ...
1
vote
2answers
117 views

What are laws in physics? [duplicate]

Many times a precise definition of something in physics is not available but yet there exist some rough definitions that guide us through. I need the same rough (if not precise) definition of physical ...
5
votes
3answers
181 views

Are there any physics formulas with high/large exponents? [closed]

Most physical laws seem to only have low integer exponents for their variables - in my experience I've never seen a physical law containing variables raised to a power greater than 3 or occasionally 4....
8
votes
1answer
204 views

How do we know the laws of physics remain the same in different dimensions?

Section on Wikipedia dealing with the possibility of different dimensions. When reading this section it feels like there's a giant elephant in the room that is not addressed. For example, here's a ...
-2
votes
3answers
70 views

What is the necessity to universalise a law? [closed]

What are the necessary conditions or observations that are required for universalisation of a law? I am not good at English so by universalise I mean to claim something to be universal. So how can ...
3
votes
2answers
121 views

Are these Stephen Hawking's statements legitimate? [closed]

I am reading 'Brief Answers to the Big Questions' by Stephen Hawking and it seems to me that some of his statements are just hypotheses, but they are written in such a way that they 'sound' like they ...
-1
votes
1answer
32 views

A circuit out of a ring in amper law paradox [closed]

Assuming that there is three line of circuit and our amper ring is surrounded just two circuit . According to amper law the magnitude of B is just related to the circuits in the ring . But here the ...
1
vote
3answers
382 views

Why we don't use Ampere's law to find the magnetic field due to a wire of finite length at its perpendicular bisector?

I know that finite length doesn't have symmetry and thus its hard to apply maths here but take the case of magnetic field of a wire of finite length at a distance r from axis of the wire exactly at ...
1
vote
0answers
22 views

Arranging objects by mass [closed]

I have n objects with different masses . Say mass of n1=m1, n2=m2 .... so on. I want to use concept of centrality in physics to arrange these objects in a field (computer simulation ) . Where object ...
0
votes
1answer
79 views

Are there other theories (apart from string theory) that combined with inflation, would produce universes with different laws?

In chaotic inflation, space would stop expanding in some points, creating hubble volumes that could experience different spontaneous symmetry breaking, which would result in different properties, such ...
1
vote
1answer
45 views

Question reg. reasoning of deterministic reversible cyclical laws - The Theoretical Minimum

I recently started reading "The Theoretical Minimum: What you need to know to start doing Physics". In the first chapter, the authors define the "Minus-First law", and state that reversible ".. laws ...
1
vote
4answers
382 views

Difference between Postulate versus Law

In quantum mechanics, we have many different postulates. In classic mechanics, we have different laws. As far as I know, physics's laws are temporarily correct until an anomaly. But what is the ...
1
vote
0answers
45 views

What physical laws differs in non inertial frame

For me physical laws should be observers independent, what should be depend on the observers are measurements. But one of the postulates of Special relativity is that all laws of physics should be ...
-1
votes
2answers
87 views

Examples of theories that assume the existence of an “External Reality”?

In this paper written by physicist Max Tegmark (https://arxiv.org/pdf/0704.0646.pdf) it talks about "External Reality Hypothesis". Specifically, he says: Although many physicists subscribe to the ...
0
votes
0answers
51 views

Is Universal Law of Gravitation a 'law'? [duplicate]

My textbook mentions that the universal law of gravitation cannot be proved. If so, then why is it called a 'law' and not a 'hypothesis'?
1
vote
2answers
56 views

Does the principle of explosion mean we can prove objects must “fall up” because QM is inconsistent with GR?

(Not sure if this is more appropriate to the Maths.SE) The Principle of Explosion is a law of classical logic which says that if we accept inconsistency, then everything becomes possible. I am ...
-2
votes
1answer
56 views

Would any continuous model of the universe have/be based on hypercomputational laws?

I've read that when Turing-Church thesis is applied to the universe and physics, one of the three interpretations that we can use and is defended by some important physicists is that: "The universe ...
1
vote
3answers
250 views

Is physics the same everywhere in the universe, what if it isn't? [closed]

So, my friend the other day brought up an interesting topic, does physics need to be the same everywhere? He asked, how do we know the universe doesn't, say, simplify itself, far away from us? For ...
16
votes
3answers
2k views

Is the second law of thermodynamics a “no-go” theorem?

As defined here, there are several no-go theorems in theoretical physics. These theorems are statements of impossibility. The second law of thermodynamics may be stated in several ways, some of which ...
2
votes
4answers
210 views

Thermodynamics second law variational statement query

In thermodynamics as I understand entropy is a state function. A state function is a property whose value does not depend on the path taken to reach that specific value. In contrast, functions that ...
3
votes
1answer
50 views

Theories, Corollaries, and Models

I apologize if this question seems overly basic. I was wondering how to recognize what a theory is really saying, as opposed to the explanation/corollaries that are drawn from it. As an example, take ...
1
vote
1answer
114 views

Faraday's Law and the Law of Inertia

Faraday's Law can be stated qualitatively as : Any loop (of wire) opposes/resists the change of magnetic flux through it. The Law of Inertia states that any physical object resists its change in ...
1
vote
2answers
77 views

Issue regarding Newton's second law

Newton's second law says that : The rate of change of momentum of a body is directly proportional to the applied force and takes place in the direction in which the force acts. Mathematically it says,...
-1
votes
3answers
251 views

What are the most fundamental laws of Newtonian Physics? [closed]

By fundamental, I mean, those laws which if assumed could be used to prove all other laws and provide the essence of the complete picture. I am a high school student, while learning physics I came ...
1
vote
1answer
410 views

If two different theories describe experimental observations equally well, can one be said to be more valid than the other? [closed]

Assuming both use accepted rules of logic, which of the two theories would be accepted and on what basis, for example: simplicity etc.
2
votes
5answers
183 views

Why are the laws of nature consistent? Is it possible for there to be an existence where (eg.) gravity works only some of the time?

Why does the universe always apply the precise forces/events/occurrences in such a way that it wont let you ever catch it in a paradox? What creates the consistency?
-1
votes
1answer
170 views

Why do the laws of physics fail to predict the behavior of frustrators? [closed]

This is my attempt to make an earlier question less broad. This question takes the form of a thought experiment, and is based on this video. Suppose you are given: The positions, velocities, ...
3
votes
4answers
202 views

How are theories selected?

My motivations for asking this question are philosophical but I think this is a question that is best answered by the physics community. There is a problem in the philosophy of science called the '...
0
votes
2answers
98 views

What laws/assumptions are considered fundamental/axiomatic to the widest range of fields of physics?

Inspired by the PBS Space time video on Noether's Theorem released the other day, I got to thinking about what can be considered the most fundamental laws in Physics. They mention in the video that ...
0
votes
1answer
211 views

Can the fundamental laws of Physics be formalized as axioms written in First Order Logic (FOL), or any other logical system for that matter?

Is it possible to state any fundamental law in Physics as an axiom written in First Order Logic (FOL), or any other logical system (and semantic interpretation) for that matter? EDIT: in a way that ...
1
vote
1answer
127 views

Static temperature

A Professor of Fluid Mechanics a told that the static temperature is the temperature observed when the relative speed between observer(thermometer) and fluid is zero. I have trouble understanding as ...
0
votes
2answers
158 views

Do we study the true nature of the universe or reality or just create a model (mathematical) to get approximation close enough to our use? [closed]

Do we study the true nature of the universe or reality or just create a model(mathematical) to get approximation close enough to our use? whether they have to do any thing with reality or not. I have ...
1
vote
0answers
113 views

What physical laws would need to change? [closed]

My fictional worlds reside in a multiverse. More specifically, they reside in a universe within that multiverse that is very similar to ours. But here are some big differences: White holes are in ...
1
vote
1answer
24 views

An electricity experiment [closed]

Ohms law can be sated as V=IR. a. Suppose in an experiment, data is collected of the variation of current with resistance R. Next a plot of R vs I -1 is made. How does one determine the value of V ...
3
votes
1answer
284 views

Are certain fields of physics axiomatized?

Everything from Quantum mechanics can be derived from six (?) postulates. Similarly classical electrodynamics can be reduced to Maxwell's equations and Lorentz force law, and special relativity is ...
-2
votes
1answer
172 views

Difference between a law and a theory [duplicate]

What is the difference between a law and a theory? Some seem to think that a law is a single relationship or a single equation, while a theory is an explanatory framework in which these laws come ...
0
votes
1answer
42 views

Could the equations of physics evolve over time? [duplicate]

Current equations describe everything pretty well but there are some issues considering inflation, quantum gravity, black holes,... How would we be able to verify that these do not evolve over long ...
0
votes
1answer
120 views

Non-negotiable laws in physics [closed]

Are there laws (axioms / principles / equations / inequalities) in physics that cannot be violated, no matter how slightly, by hand without leading to absurdities (singularities, inconsistencies)?
0
votes
3answers
87 views

Need an example of an experiment highlighting Time translation Symmetry

So I have been doing some research on different types of continous symmetries (mainly interested in continuous symmetry since I have been learning abit about Noethers theorem.) and understand the ...
3
votes
3answers
146 views

How Newton's laws replicate themselves on a larger scale?

Now I was reading The Feynman Lectures on Physics and found this which I found somewhat peculiar and deep and thus want your assistance here. So here it goes: The theorem concerning the motion of ...