# Tag Info

1 vote

### Why does the total gravitational potential in the universe exactly equal the total mass energy RIGHT NOW?

First of all, it's extremely difficult to even define the total energy of the universe, and all sorts of different features (dark energy, dark matter, the energy of the cosmic microwave background, ...
• 8,681
Accepted

### How mass change can be converted to energy?

To find the energy released, just look at the mass difference because according to the question you have given, there is both a starting mass and a final mass, so it is possible that not all of the ...
• 1,351

### How mass change can be converted to energy?

I doubt we can just use mc2 You can. That's the answer. Any procedure giving another answer would have to account for the missing/excess mass-energy.

### $Q$-value (nuclear)

*** Does this answer deserve two downvotes? *** Define your formulas as (a+b-c-d)*w If any of a, b, c or d represents the mass of a reaction product containing protons, as in an isotope, a proton or ...
Accepted

### Equation for relative Kinetic energy

In special relativity, the total energy of an object is given by; $$E = \sqrt{ (pc)^2 + (m_0 c^2)^2} = \sqrt{(\gamma m_0 v c)^2 +(m_0 c^2)^2}$$ where $p$ is the relativistic momentum $(\gamma m v)$. ...
• 2,175
No. Relativistic kinetic energy is difference of relativistic energy and rest energy of object. To check that your proposal does not hold,- simply try to equate these expressions, like :  \tag 1 (\...