Tagged Questions
-4
votes
0answers
50 views
Why does an object with higher velocity gain more mass? [closed]
if we inject pure energy into a object capable of moving will it affect the structure of its atoms creating bigger neutrons, electrons and protons making the object increase its size affecting its ...
-1
votes
2answers
121 views
Do objects have energy because of their charge?
My gut feeling tells me things should have energy because of their charge, like they have energy because of their mass.
Is this possible? Has it been shown? If not then what is missing to make such ...
7
votes
4answers
349 views
How does $E=mc^2$ put an upper limit to velocity of a body?
How does $E=mc^2$ put a upper limit to velocity of a body? I have read some articles on speed of light and they just tell me that it is the maximum velocity that can be acquired by any particle. How ...
0
votes
1answer
77 views
Developments originating from $E=mc^2$
What kind of significant impacts have originated from $E=mc^2$.
Generally, it is regarded as the most famous equation of all time. Except for nuclear energy (fission and fusion) I do not know any ...
0
votes
1answer
99 views
Photons, no energy? [duplicate]
I am only 14, so I don't know much about physics, and I would appreciate help on this topic.
A photon, is said to have 0 mass. However, they carry energy, as electromagnetic radiation. Albert ...
1
vote
2answers
103 views
Does the mass of a falling body decrease?
Let's say a body with m=2kg falls from 100 meters. Obviously it's speed would be far lower than the speed of light so the change in mass (if it exists) would be very tiny. However, I know that if the ...
1
vote
6answers
253 views
What can $E=mc^2$ do?
In the famous equation $E=mc^2$, the variables stand for:
$E$ is energy, $m$ is mass, and $c$ is the speed of light (in vacuum).
And I understand the equation fairly but limited in knowing in ...
3
votes
2answers
95 views
Mass-Energy Equivalency
We call $E=mc^2$ the Mass-Energy Equivalency because it equates mass and energy together. But, by that same logic, shouldn't we call $E=\frac{1}{2}(mv^2)$, the equation of kinetic energy in Newtonian ...
2
votes
2answers
532 views
Why does an object with higher speed gain more (relativistic) mass?
Today, in my high school physics class, we had an introductory class on electromagnetism. My teacher explained at some point that an object with a very high speed (he said it started to get somewhat ...
2
votes
2answers
151 views
Is there any law that prevents an object with mass to become massless?
I got into a discussion with my physics teacher about the speed of light and I asked
What if an object with mass was to lose mass as it gained speed-- would that allow for an object to eventually ...
0
votes
0answers
48 views
How could I get to $E=mc^2$? [duplicate]
Possible Duplicate:
Did Einstein prove $E=mc^2$ correctly?
What was Albert Einstein’s proof for $E=mc^2$?
I wanted to know, How did Einstein come up with $E=mc^2$. I read it´s related to ...
0
votes
4answers
218 views
Mass-Energy relation
Einstein mass- energy relation states $E=mc^2$. It means if energy of a paricle increases then mass also increases or vice-versa.
My question is that what is the actual meaning of the statement ...
5
votes
4answers
624 views
What was Albert Einstein's proof for $E=mc^2$?
Most people know the famous equation:
$$E=mc^2$$
What were his steps of thinking for this equation that helped us discover so much about our world?
1
vote
2answers
161 views
Does infinite energy imply Infinite mass (and vice versa)?
If some kind of source was able to supply an infinite amount of energy, does that imply that it also must have an infinite mass? Is the contrary also true?
3
votes
4answers
348 views
Does $p=mc$ hold for photons?
Known that $E=hf$, $p=hf/c=h/\lambda$, then if $p=mc$, where $m$ is the (relativistic) mass, then $E=mc^2$ follows directly as an algebraic fact. Is this the case?
5
votes
3answers
173 views
What's the purpose of the arbitary additive constants in Einstein's Inertia of Energy Paper?
In Einstein's paper: Does the Inertia of a Body Depend upon its Energy content? he introduces arbitary additive constants whose purpose I'm confused about.
The paper has a frame $(x,y,z)$ where a ...
0
votes
3answers
524 views
Getting from $E^2 - p^2c^2 = m^2c^4$ to $E = \gamma mc^2$
What is each mathematical step (in detail) that one would take to get from:
$E^2 - p^2c^2 = m^2c^4$
to
$E = \gamma mc^2$,
where $\gamma$ is the relativistic dilation factor.
This is for an ...
4
votes
2answers
339 views
Does the mass of a body absorbing photons increase?
Let's say I have a photon collector in orbit around the sun. It manages to collect photons perfectly efficiently, that is, without radiating off any energy.
Then, using Einstein's equation:
$$E = m ...
2
votes
1answer
105 views
Can non-free forces change the rest mass?
While reading Hobsen et al.'s "General Relativity: An Introduction for Physicists", I came across a bit confusing derivation. Multiplying the 4-force and 4-velocity, the following derivation can be ...
1
vote
2answers
173 views
The time component is $\gamma m c$, so shouldn't $E=mc$?
Basically, the book is Brian Cox's Why Does $E=mc^2$?: (And Why Should We Care?).
I just finished Chapter 5, where we derived the spacetime momentum vector (energy-momentum four vector, as he ...
