# Questions tagged [mass-energy]

The special-relativistic relation connecting energy with mass, $E^2 - (m c^2)^2= (pc)^2$. May be used to provide accounting constraints in energy and momentum, both conserved in total, even in reactions where $m$ is not.

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### Why nuclear binding energy influence mass?

I do understand this from a energy point of view. However, let's consider a system with two small mass point in a classical case. The total mass of the system should be $M=m_{1}+m_{2}-\frac{E}{c^{2}}$ ...
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### Why is mass a form of energy?

Why is mass a very concentrated form of energy? Does it have to do something with photons, phonons or nucleus?
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### What are all the similarities between momentum and energy?

I noticed that there are a lot of similarities between momentum and energy, and it's almost like momentum is the time-like version and energy is the space-like version of the same thing. For example, ...
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### Energy when near the speed of light

An unknown particle with rest energy of $1 \text{ MeV}$ is traveling with a speed of $0.6c$ along the $x$-axis in our rest frame when it decays into two photons, also travelling along the $x$-axis. ...
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### $\beta^-$ and $\beta^+$ $Q$ value issue

It's unclear to me why the following doesn't work when I calculate the $Q$ value for $\beta^-$ and $\beta^+$ decay. If we start with a parent nucleus $P_z$ with $Z$ electrons decaying through $\beta^-$...
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### Why is mass an invariant in Special Relativity?

I have read here that mass is an invariant and that it is the momentum that approaches infinity when your speed approaches the speed of light. That is why infinite energy is required to accelerate an ...
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### Particle Physics - minimum energy for $p + p \rightarrow p + p + \bar{p} + p$ [closed]

A beam of protons with energy $E_p$ is made to collide with a stationary target and a search for the interaction $p + p \rightarrow p + p + \bar{p} + p$ is made. I have to estimate the minimum ...
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### Can the Higgs particle escape a black hole? [duplicate]

The higgs particle or field is what gives mass to everything. It's said that nothing can escape a black hole. If that is true how can the black hole "tell" its mass as even the higgs would not be able ...
112 views

### Can the mass of an object account for the total internal energy of the object?

While studying thermodynamics my book describes the quantity the internal energy of a system. My book states: The concept of internal energy of a system is not difficult to understand. We know that ...
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### Could 2 collided neutron stars partialy lose mass?

If two collided black holes lose a huge part of their masses before collision do a pair of neutron stars lose such quantity of mass and is the density of an astronomical body the cause of how much of ...
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### Clarification regarding the mass-energy equivalence

In this recent question: As neutrons are more massive than protons does Sun increase mass while fusioning elements? It is stated that not only does the Sun not gain mass, but it loses mass at 4 ...