Questions tagged [physics]

For questions about the scientific discipline that concerns itself with analyzing the laws of nature in full generality. It is one of the largest branches of natural science. Before applying this tag to a question, please consider using the "theoretical-physics" or "experimental-physics" tags instead, as they are more descriptive.

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4
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4answers
120 views

Where did the false “equal transit-time” explanation of lift originate from?

It's supposedly a "widely circulated" false claim that wings generate lift because of their asymmetric shape, forcing air above to travel faster so that they meet up on the trailing edge at the same ...
5
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1answer
2k views

What are the major flaws of the “caloric” theory of heat?

I was reading about the history of thermodynamics and came across Lavoisier's idea of heat. He proposed that heat was a fluid. I am curious to know what are the major drawbacks of this theory. I know ...
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Feynman's statement about the importance of basic science

I remember reading in the line that Feynman saying if the best technicians were tasked to build a radio they would make longer and thicker cables and transfer message but it took a physicist to ...
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0answers
21 views

Did Werner Heisenberg ever agree or propose the existence of some kind of multiverse?

I was watching a video (https://www.youtube.com/watch?v=muJYTeQlvC4) where the director of a videogame company speaks about one of its most successful games. This game is set in a floating city which ...
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1answer
65 views

Reference for history of physics with description of mathematical models

I am interested in some reference text, for example, textbook that would describe going from old times (say, Greece) till modern times: 1) definitions of units and measurements 2) describing ...
3
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1answer
75 views

Did old Crookes Radiometers ever have a pair of terminals?

This is a question about old physics lab equipment. This and this question led to the question in SciFi SE Crookes Radiometer at the end of a telescope in old movie scene, something about a comet? ...
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0answers
27 views

Did Wheeler accept Carter's anthropic principle-based multiverse?

Physicist John Wheeler wrote an article called "Genesis and Observership" where he said near the end: "We have reviewed the evidence out of the big bang tat the universe did come into being and the ...
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0answers
55 views

Did Wheeler ever propose the existence of a multiverse containing parallel simultaneous universes?

It is known that the physicist John Archibald Wheeler proposed the existence of a multiverse in the form of a set of cycles of Big Bangs and Big Crunches (Cyclic/Oscillatory Multiverse Model). But I ...
4
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1answer
3k views

An English copy of One Hundred Authors Against Einstein?

I've been trying to find the famous article, "One hundred authors against Einstein" (100 Autoren gegen Einstein), of various objections to special relativity, which is quite often referenced, but ...
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0answers
75 views

What did people mean by the term Force in earlier times?

Initially I used to believe that before Newton gave his Laws of Motion, people thought that Force was something that caused motion. It was Newton who first said that Force is something that causes ...
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1answer
71 views

Did physicist David Bohm ever propose the existence of a multiverse?

Did physicist David Bohm ever propose the existence of any kind of multiverse?
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1answer
2k views

How was Einstein led to make a contact with Differential Geometry for his theory of General Relativity?

General Relativity was developed with Differential Geometry as the tool. How was Einstein led to make a contact with Differential Geometry for his theory of General Relativity? Who suggested him to ...
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7answers
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In ancient times, how did people conclude that the shape of Earth is a sphere?

This is more of a philosophical question, but I want a mathematical explanation. During ancient times, it was well accepted that the surface of Earth was spherical. People first observed this when ...
2
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1answer
96 views

What was this experiment tainted by the observer effect?

I once heard a cautionary tale about the dangers of the observer-expectancy effect. It was at least presented as a true example from the history of science, but I'm having trouble identifying the ...
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3answers
79 views

Does Heliocentrism predate Copernicus?

I have seen this mentioned on the interwebs a few times. people have mentioned that some Greek thinkers and Islamic astronomers came up with heliocentrism before Copernicus and that Copernicus copied ...
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0answers
224 views

What was the need for Lorentz transformation in pre-relativity period?

Why was it necessary for the velocity of light to be invariant between different inertial frames and hence what was the need for Lorentz transformation when it was believed that velocity of light was ...
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0answers
40 views

How did Gibbs discover Gibbs entropy?

I have read and I think that I agree with the idea that if we have to choose probability distribution for an unknown system then it is a good idea to choose a distribution that has the least bias. I ...
16
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3answers
5k views

Is this Einstein rejection letter fake?

So I found this on the internet the other day- Is this fake? Are there any ways to prove that it's fake? Does there, if any, exist any real copy of such a rejection letter?(Was Einstein ever ...
2
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0answers
105 views

Who discovered Maxwell-Faraday equation, $\nabla\times E=-\frac{\partial B}{\partial t}$? Was it Maxwell or Neumann?

I have been trying to find out who discovered Maxwell-Faraday equation, $\nabla\times E=-\frac{\partial B}{\partial t}$. Was it Maxwell himself, or was it Franz Ernst Neumann who derived it? The ...
6
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1answer
220 views

How were negative numbers first used in physics?

The use of negative numbers in most of today's calculations is natural. But how did the use of negative numbers began in physics? What physical quantity required the introduction of negative numbers ...
7
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1answer
387 views

Who was this man (who is not Bruno Pontecorvo)?

The English-language Wikipedia article about physicist Bruno Pontecorvo is illustrated with this photo: Now, this man seems distinctly different from most portraits of Pontecorvo around: The ...
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2answers
719 views

What became of the Boltzmann-Zermelo debate about the second law of thermodynamics?

At the end of 19th century there was a lively discussion about the nature of the second law of thermodynamics, and its relation to Hamiltonian dynamics. Boltzmann developed a position that the second ...
6
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1answer
201 views

When and how did the notion/idea of physical constant emerge?

Physical constants (e.g. c, h, G, alpha and so on) play a central role in our scientific theories and they have yet drawn much of controversial flavor into questions concerning the foundational status ...
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40 views

Did Ludwig Boltzmann ever go to Copenhagen or any other part of Denmark?

Did Ludwig Boltzmann ever go to Copenhagen or any other part of Denmark? I also read that he was appointed "Honorary Doctor" by the university of Oslo. Does this mean that he went to Norway? https://...
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1answer
78 views

Are Wheeler's It from Bit/Participatory Universe and the Multiverse related?

Could I ask you for the relation between Wheeler's ideas and the multiverse? Do you know if these are related? I ask you this because I found this very interesting article written by Kip Thorne with ...
30
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4answers
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Whose shoulders did Newton stand on?

In a letter to Robert Hooke in 1676, Newton wrote: If I have seen further it is by standing on the shoulders of giants. Do we know which giants Newton was referring to? And was he referring to a ...
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5answers
485 views

Has science fiction ever caused scientists to do real research?

Has science fiction ever caused scientists to do real research? Science fiction here means fiction that tries to explain things in the world rather than speculate about the future or unexplorable ...
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1answer
74 views

Did John von Neumann ever go to any Nordic Country? Did Eugene Paul Wigner ever go to any other Nordic Country apart from Sweden?

I'm researching about the presence of important scientists in Nordic Countries (Iceland, Norway, Denmark, Sweden and Finland). I was hoping that someone could help me since I've not been able to find ...
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2answers
2k views

Which physicist is this quote attributed to?

There is a quote from a 19-20th century scientist that goes (and I am paraphrasing): New scientific theories are never accepted until old scientist die. Who is this cynical quote attributed to, ...
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1answer
289 views

Who introduced the partition function?

Is it by Gibbs? Or Boltzmann? I do not expect Maxwell. The point is, how was the textbook introduction of partition function today developed.
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2answers
3k views

Why is Einstein's mass-energy relation usually written as $E=mc^2$, and not $\Delta E=\Delta m c^2$?

Why is Einstein's mass-energy relation usually written as $E=mc^2$, and not $\Delta E=\Delta m c^2$? When you calculate the energy $\Delta E$ released during nuclear fission, you take the difference ...
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2answers
122 views

What are the great works of Richard Phillips Feynman? [closed]

What are the prerequisites to read his book? Why Richard Phillips Feynman is so famous? What are great works of Richard Phillips Feynman?
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2answers
109 views

How did Henry Cavendish deduce the inverse square law in electrostatics from his experiment in 1772?

An elegant experiment in 1772 by Henry Cavendish. Cavendish charged a spherical conducting shell that contained within it, and temporarily connected to it, a smaller sphere. The outer shell was then ...
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2answers
161 views

What animals or plants were used to illustrate ideas of physics?

This crossed my mind today... There is Schrödinger's cat and Newton's apple. Are there any other famous animals/plants featured in physics in a similar way?
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1answer
1k views

Why did Einstein oppose quantum uncertainity?

Einstein always believed that everything is certain, and we can calculate everything. That's why he rejected quantum mechanics, due to its factor of uncertainty. But still quantum physics was right. ...
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1answer
65 views

What was Isaac Newton's contribution to optics?

What was Isaac Newton's contribution to optics? I know that he believed in the corpuscular theory of light. Did he know about the laws of reflection ad refraction?
5
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1answer
85 views

Refraction in Newton's Corpuscular Theory of Light [duplicate]

Newton's theory of light stated that a light travelled in a straight line as small particles. When these particles travelled in a medium, they experienced an attractive force with the particles of the ...
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6answers
245 views

Remarkable numerical calculations before electronic computers

I know the story that Cole found the factoring of the big number $2^{67}-1$. Is there any other remarkable achievement of hand calculation?
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2answers
2k views

Why is magnetic flux named after Nikola Tesla?

I have my respect for Mr. Tesla, but it seems weird that "he" was chosen to be the units of magnetic flux. I mean, he didn't contribute much to magnetic fields theory, nor did he work with them a lot. ...
2
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0answers
85 views

Were notable physicists great at math or computing? [closed]

Were famous or popular physicists like Galileo, Newton, Einstein, Feynman predominantly mathematicians or scientists (computing, experimenting, engineering, etc.)? I am curious if people like the ...
3
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1answer
137 views

How did philosophers and scientists in the 18th century view mathematical explanation?

The 18th century saw a rise in the use of mathematical formalisms to account for natural phenomena. Works of Lagrange, Euler, d'Alembert, etc., were groundbreaking in the history of mechanics and ...
5
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1answer
107 views

Equivalence principle before Einstein [duplicate]

In a German interview some physicists were asked, what they would ask Einstein, if he were alive today. One of them wanted to know how Einstein came up with the idea of the equivalence principle, that ...
7
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2answers
193 views

Was there early opposition to Newton's mechanics?

Scientific theories are rarely accepted immediately. Even if the evidence for a theory is impeccable, there will be some stragglers who resist it for lack of understanding. More interesting is when a ...
6
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2answers
2k views

Why did Aristotle make mistakes in his laws of motion?

I was studying Aristotle's laws of motion and comparing them to Newton's. He states that heavier bodies fall faster than lighter ones. I really can't understand how he could have committed such a ...
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0answers
40 views

Does anyone know articles or books about what the notion of difficulty in science, especially physics?

In physics, many problems were known at their time to be very challenging, for example the notion of heat, or how to understand the ideal gaz law, or the phase transition criticial behaviors, etc. And ...
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1answer
1k views

What were the dominant non-atomic theories of matter in the 19th century?

From what I have read, the atomic theory of matter was cemented by a 1905 paper by Einstein in which he explained the erratic motion of a bit of pollen suspended in water using the assumption that ...
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1answer
126 views

Is Newton going to be the new Aristotle? [closed]

As general relativity and quantum mechanics become more accessible, is Newton going to become the new Aristotle, as the example of being wrong and misleading humanity for centuries? (as opposed to the ...
8
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3answers
914 views

What is the history of the energy concept and its measurement?

Could someone please explain how the concept of energy was originally conceived and how it evolved over time to our current understanding of it? Also how did people come about various ways of ...
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2answers
91 views

Can anybody identify an appropriate radio for this game?

This is quite a specific question about radio, but it has been rejected on the Amateur Radio and History Stack Exchanges, so I will ask it here... I'm a complete radio ignoramous, but I've been ...
4
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1answer
250 views

History of Energy

Can anyone suggest me some book/article explaining how and why the quantity named 'Energy' made its way into physics? I have gone through "Lectures on Physics" (Vol. 1) by R.P. Feynman and have been ...