Recent content by mister i

My knowledge of physics is very limited, for example I don't know if kinetic energy could have an equivalence with matter through the formula ##m=E/c^2##. If it does, then my common sense tells me that it must be very large since there are billions of billions of stars moving at high speeds in...

It is said that the universe is made up of approximately 4.9% ordinary matter, 26.8% dark matter and 69.3% dark energy. Why isn't ordinary energy included in this "pie"? I suppose it is included within ordinary matter, but could it be calculated what % are particles with mass and what % is pure...

I also think there is no limit but about references: https://link.springer.com/article/10.1007/BF00662806 https://arxiv.org/abs/hep-th/0210109

Can the force of gravity overcome the Planck force? I remember that a long time ago I read that in the universe the Planck force was the maximum force that could be reached. But when Sagittarius A and the black hole at the center of the Andomeda galaxy approach, I have made the calculation that...

Sorry, but in this post I am not talking about unit conversions, but rather I deduce "virtual" equations solely through constants and dimensions. Specifically, these are the 4 that I put here again: (1) ## m = k (c^3/G) t ## (2) ## m = k (c^2/G) l ## (3) ## m = k (Fp/c) t ##...

We know that in the universe we can establish an equivalence between length and time through a constant (the speed of light): l = ct and talk about length in units of time (light-years). But, by playing mathematically with the dimensions of M, L and T and the constants G and c we can see...

I'm not English (I speak Catalan), but I suppose schlumpf has no translation or meaning and is an ironic response. I would have really liked this answer. For me, all the answers are useful to see what physicists currently think about the matter. But the question was to rule out that there was...

As far as I know a field is spatial&time region in which each point has a physical quantity associated with it (vector or scalar). We know from GR that in the case of the gravitational field it is due (only?) to a curvature of space. But what about the other fields? What gives the value...

Sorry for my questions as an amateur interested in physics: If light changes its frequency during a long time of travel in space (vacuum?) for all observers (redshift) and therefore its energy decreases (E=hf), what "entity" absorbs this energy? I suppose the answer will be that the wavelength...

I am not a physicist but if someone can answer this question: It seems that there is a dark energy in the universe. Could it be associated with an (unknown) dark force acting at great distances?: I don't quite understand that when we talk about the approach of galaxies we talk in terms of force...

Thanks and sorry (I didn't see your reply yesterday)

Can the expansion/creation of space in the universe affect the speed of light over long distances? (dividing the space traveled (including expanded space) by the travel time). If the Hubble constant is valid throughout the universe, it follows that from a certain Megaparsec of distance, galaxies...

And what happens regarding the light (which is indeed moving), from our point of observation it travels in this expanding space at 300,000 km/s or do we have to add the part of the spatial expansion?

Sorry for this question: how does a compass (or its electrons) know that it is in a magnetic field? Is it the information of the photons that cross it? (photons are what transmit electromagnetic forces)

The age of the universe is said to be about 13.8 billion years. But, since time depends on the observer, would it be the same for a possible inhabitant of a planet in a galaxy about 10,000 million light years away that is separating from us at 60% of the speed of light?