All Questions
62
questions
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How does mass-energy equivalence work with chemical bonds? [duplicate]
If you have, for instance, 2 oxygen atoms and do E=mc2 to get their equivalent energy, you get about 2.38nJ. However, if you have diatomic oxygen, there's also the energy of the bond; about 0.8aJ. ...
- 185
-1
votes
2
answers
78
views
Rest Mass Energy
What exactly is the Rest mass energy? I know the usual goes Like it is total energy stored in mass $m$ that is in Rest. so for someone moving relative to the frame that the mass $m$ is in (a rest ...
- 73
0
votes
3
answers
138
views
Why does an alpha particle traveling at the same speed as a beta particle have 'only' about twenty times the energy? Rather than over seven thousand? [closed]
An alpha particle travels at about half the speed as a beta particle, right? ~5% of light speed versus ~10%?
Therefore, if you doubled its velocity, its energy would roughly quadruple, correct? (Or ...
- 4,509
1
vote
2
answers
198
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Equation for relative Kinetic energy
Relative Kinetic energy is given by
K.E = ($\gamma$-1)$m_0$c²; where $m_0$ is rest mass
but can it also be given by this
K.E= $\frac{1}{2}\gamma m_0v²$;
where v is velocity of particle
can it?
- 367
2
votes
8
answers
306
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If matter is a form of energy, can it be converted into another form of energy?
I have been told that energy and mass are the same. What puzzles me is why don't we use the same units of measure for both if they are the same? The unit of mass is kg and the unit of energy is the ...
- 151
2
votes
3
answers
207
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Energy and momentum & the relation between them
I am trying to wrap my head around energy, mass and momentum, especially in the more general scope of special relativity where massless objects moving at the speed of light also have momentum. So I am ...
- 219
0
votes
3
answers
150
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Can matter be mass and energy simultaneously? [closed]
I am well aware of the fact that this question is very elementary and I should not have posted it on StackExchange. I wouldn't have had, but most of the reddit forums where I ask questions have gone ...
- 95
3
votes
2
answers
151
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How does most energy get transfered to mass at high relavistic speeds, but mostly to movement at low speeds?
From what I understand about relativity, it is impossible to accelerate a massive object to the speed of light because it's mass would become infinite. Once an object is moving close to the speed of ...
- 79
0
votes
2
answers
408
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Derivation of Energy-Mass Equivalence: Total energy = kinetic energy $+ mc^2$ [duplicate]
How do you derive the energy mass equivalence just from special relativity? To be exact, in this video, https://www.youtube.com/watch?v=KZ8G4VKoSpQ, at around 23 minutes in, he claims that the total ...
- 480
2
votes
5
answers
2k
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Why relativistic mass of a body increases with its speed? [duplicate]
We know the formula,
$$m = m_0/(1-v^2/c^2)^{1/2}$$
since $v$ is usually way less than $c$, ($v^2/c^2$) is less than one which indicates a body's mass increases when it has a speed. Can someone please ...
- 195
-3
votes
2
answers
66
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Energy of particle in equilibrium [closed]
Suppose I have a mass let say a mass of M kg
Imagine, it is in equilibrium
No force is acting on it
Due to no force its energy must be zero .
But why it is said that mass at rest also has energy ...
- 395
0
votes
2
answers
247
views
Loss in mass due to energy decrease
As an object cools down it looses energy. As $E=mc^2$ I would also assume this would correspond to a decrease in the mass of the object. When the energy is released from the substance this corresponds ...
- 1
0
votes
1
answer
110
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Mass: a form of energy [closed]
Einstein's $E=mc^2$ and law of conservation of energy implies that mass is a form of energy, but if it is a form of energy then why can we freely interact with mass while the other forms of energy are ...
1
vote
1
answer
126
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Why momenergy has magnitude equal to the mass?
The mom-energy of a particle is a 4-vector: Its magnitude is proportional to its mass, it points in the direction of the particle's spacetime displacement, and it is reckoned using the proper time for ...
user307064
10
votes
4
answers
3k
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Can massless particles travel slower than the speed of light in vacuum?
We know an object with positive mass cannot be accelerated to the speed of light because this would require an infinite amount of energy. My question is:
Is there anything in the universe that can ...
