Physics Forums

Is there any other problem as simple as placing queens on an N×N board?. Does admitting to difficulties in finding a solution count as failure? Is the idea of a shortcut dismissed by the majority, or is it still considered possible? If there is no shortcut, why does it involve calculations at... Read more

Hi, I would like to share a personal project that has been part of my life for more than twenty years. I have started working on the first version in 2004 as a small collection of physics experiments and visualizations. Over the years with many rewrites and long pauses in between it gradually... Read more

We don't know exactly what we'd need, so it'll be a somewhat back and forth thing. I do believe they have a desired outcome though. I've contacted them just now to ask. Anyway. Help would be greatly appreciated.

What quantum physics(randomness) tells about our reality? everything is random, there is no cause-effect world?

Can momentum considered as the resistance of a force? Why?I noticed that the physical meaning of momentum and inertia are similar

Is there any other problem as simple as placing queens on an N×N board?. Does admitting to difficulties in finding a solution count as failure? Is the idea of a shortcut dismissed by the majority, or is it still considered possible? If there is no shortcut, why does it involve calculations at... Read more

Given that Dark Matter and Dark Energy are estimated to account for roughly 95% of the universe's total mass-energy content, the fundamental nature of these phenomena remains a critical question in modern cosmology. Currently, the standard Lambda-CDM model treats them as distinct, physical... Read more

greetings I've got a Chefman branded electric kettle (Chefman-Rj11-17) that went haywire - the kettle can be turned on normally, and the small LED on the handle displays water temperature, however, during the heating process, the temp displayed jumps to 212F rapidly, and the kettle turned off... Read more

Brilliant paper https://arxiv.org/abs/2202.04203v2 recently published in Nature Communications (open access) https://www.nature.com/articles/s41467-024-47170-2 resolves and demystifies the Frauchiger-Renner paradox associated with the Wigner friend problem. The resolution of the... Read more

sensor in slit must interact with photon, so isn't sensor reason why patterns on screen change? So what is exactly weird in this experiment? Can we somehow observe photon in slit but do not physically interact with him?

sensor in slit must interact with photon, so isn't sensor reason why patterns on screen change? So what is exactly weird in this experiment? Can we somehow observe photon in slit but do not physically interact with him?

I'm looking for a mathematical representation of a fundamental wave and it's harmonic modes. For example a wave of 590 nm what are its 'octaves'? Can the resulting formula be represented in polar coordinate 'vector' space?

I'm working on a story. It's retro-fantasy, Jules Vernian or Wellsian "First Men in the Moon" style, perhaps a space opera. In a nutshell: space travel in 1855. Some explorer/engineer stumbles upon an outcrop of handwavium, which, when properly stimulated, produces handwavium rays. The... Read more

I'm working on a story, and I want to ensure I have the basics straight. I'm not looking for any speculation, just facts. It is necessary to achieve escape velocity - not because we can't escape without achieving it - but because we need to achieve it before we run out of fuel , or... Read more

Hi, on the last page of this document https://faculty.uccs.edu/mwickert/wp-content/uploads/sites/58/2026/03/N5630_5.pdf the confidence interval diagram is to read. Somehow I feel difficult to understand it. 1. Why isn’t it related to n/N instead of n? 2. Do y+ and y- have absolute... Read more

Hi everyone! I'm a 10th-grade student (as of 2026) who is really interested in learning physics from scratch. I'm excited to learn more about how and why things work and talk with others who share the same interest.

Hi everyone, I wanted to start a discussion about one of the most fascinating questions in science: are we alone out there? Given that there are billions of Earth-like exoplanets in our galaxy alone, the odds seem high that life could exist elsewhere. However, we haven't found any definitive... Read more

In this cycle, if $$X$$ has efficiency greater than $$X^{'}$$, then we can show that, heat flows from cold reservoir to the hot reservoir. But this contradicts our everyday observation and we conclude that $$X$$ can not have greater efficiency than $$X^{'}$$. But what if... Read more

So I'm using python to compute the fourier transform of a black and white image and the images I've been getting have been different to what I expected. Input image: Output FFT: What I expected: Image from MinutePhysics's video Why are Stars... Read more

Lithium-ion batteries represent one of the greatest advances in energy storage. However, the transportation system is demanding more miles per charge. Tesla's 4680 cell has energy densities of 241 WH/Kg and 643 WH/L resulting in a 270 mile range. The Taiwanese company ProLogium has begun mass... Read more