The mass-energy tag has no wiki summary.
0
votes
1answer
41 views
The Univere's mass-energy and uncertainty
A virtual creation with total mass-energy = $E$ is allowed as long as that virtual creation doesn’t last longer than $E/h$. Can the uncertainty principle also be used to estimate the mass-energy in ...
0
votes
1answer
55 views
Why is the Heisenberg Uncertainty Principle not obvious give the conservation of mass- energy?
A photons energy is given by $E=h *f$ and momentum $p=E/c$ (spin?) but the photon has no (rest) mass! Therefore it is the ultimate probing tool for looking at any mass position and velocity because ...
2
votes
2answers
533 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 ...
-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 ...
0
votes
2answers
59 views
Is there any correlation between mass-energy equivalence and Maxwell's 4th equation?
I wonder, how came in both equations proportionality constant is exactly $c^2$?
$$c^2(\nabla \times B) = \partial E/\partial t$$
where $E$ - electric field
$$c^2m = E$$
where $E$ - energy
I am ...
1
vote
2answers
105 views
Negative potential energy of gravity
Does the negative potential energy in the gravitational field have to be considered in calculating the total mass of the system in question (because of $E=mc^2$)?
If so it seems to me that the ...
1
vote
1answer
44 views
Conversion of energy to mass with radioactive decay
Consider the following problem:
The nuclei of Am-241 decay by the emission of $\alpha$-particles with a kinetic speed of $8.8 \cdot 10^{-19} J$. In a certain source of Am-241 there are $ 4.0 \cdot ...
1
vote
3answers
206 views
Mechanism for the gravitational field generated by photons
This question follows from a schooling I received in this thread.
I figured that photons do not interact with gravity, except when they've spontaneously converted into a particle-antiparticle pair. ...
0
votes
1answer
51 views
Neutron conversion to energy? [closed]
Numerical:
If a neutron be entirely converted into energy how much energy would be produced. ($M_n = 1.6743\times 10^{-27}$kg.)
Explain
-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 ...
4
votes
2answers
136 views
Mass defect- From where mass is being lost?
As a school student, I have wondered while studying mass defect the following mysterious problem
My assumption
Just like a car's mass is constituted by each part of it(i.e total mass of car will be ...
4
votes
1answer
81 views
Mass-energy equivalence and Newton's Second Law of motion
According to Einstein's Mass-energy equivalence,
$ E = mc^2$ OR
$ m = \frac E{c^2}$..... (1)
and According to Newton's Second Law of motion,
$ F = ma$ OR $m = \frac Fa$ ..... (2)
If we compare eq. ...
1
vote
3answers
125 views
Universe to energy
Would it violate any known laws of physics to construct a universe containing no mass, only energy?
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 ...
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 ...
2
votes
4answers
125 views
Does everything with mass or energy have a gravitational pull?
As small as it may be, does every 'thing' have a gravitational pull? That is, something with mass or energy. No matter how obsolete or negligible it may be, is it there? If so, how is it calculated? ...
2
votes
5answers
475 views
Why doesn't fusion contradict the 1st law of thermodynamics?
I was reading up on the 1st law of thermodynamics for my Chemistry exam and I was wondering why doesn't fusion contradict the 1st law of thermodynamics?
The 1st law states that
The energy of an ...
-1
votes
2answers
82 views
Which units has the relation $E=mc^2$?
Fast everyone knows the relation $E = mc^2$ but I still ask me, which units the relation has.
$c$ is the velocity of light. It means, a constant, isn't it? We therefore just have the relation $E = ...
5
votes
4answers
228 views
Can you create mass with $E=mc^2$?
If you use the equation $E=mc^2$ could you make matter by dividing the $c^2$? I'm sorry if this is a really stupid sounding question or if it shouldn't be asked here.
10
votes
2answers
1k views
Higgs Boson mass in Electron volts?
Im no physics genius here, I was just interested in the Higgs Boson so I was reading this article : How the Discovery of the Higgs Boson Could Break Physics
I came across this
Furthermore, ...
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 ...
2
votes
2answers
104 views
Calculating the mass equivalency of a song?
I've recently become fascinated with the idea of sound energy having a theoretical equivalent mass. I've read over this thread:
Do light and sound waves have mass
I understand this part: ...
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?
3
votes
0answers
55 views
How many orders of magnitude in energy spans the domain of validity of the Standard Model?
I am wondering if it makes sense to state that the upper limit is roughly 1012 eV (up to know the physics probed by the LHC seems to be pretty consistent with the SM) and the lower one is ... the ...
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 ...
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 ...
-2
votes
2answers
86 views
How exactly, or whats the process, rather, of energy changing into matter?
$E=mc^2$ this is the equation by Einstein claiming energy can change from energy to mass. this would happened at the big bang I assume, when electrons and protons were made to create hydrogen and some ...
0
votes
1answer
41 views
Gravitational potential energy with regards to annihilation
Given particles A, B, C and D, where:
A and B have an equivalent mass
C and D have an equivalent mass, both larger than A (or B)
D is the antiparticle of C.
A and B start close to C, but with ...
0
votes
2answers
191 views
Photons in a gravitational field
I have been really staring for a while in a MP-Beiser book and I totally disagree with a statement he does there. On a page 85 he states that photons act as they have a mass $m$. He derives this by ...
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?
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 ...
0
votes
0answers
28 views
Energy of split of nucleus [closed]
How much energy must be supplied to the nucleus of lithium isotope Li-7 (3 protons, 4 neutrons) to separate them into individual protons and neutrons? The atomic weight of lithium is $1.1524 \times ...
2
votes
6answers
2k views
What is Energy made of?
We have the famous equation $E = mc^2$, and we also believe that matter is made of particles.
Then, What is the energy made of? If the two are interchangeable, there must be some common building ...
10
votes
2answers
288 views
How does rest mass become energy?
I know that there's a difference between relativistic rest mass. Relativistic mass is "acquired" when an object is moving at speeds comparable to the speed of light.Rest mass is the inherent mass that ...
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 ...
4
votes
4answers
672 views
Does the mass of an object change as it moves away from the earth?
The mass of a helium nucleus is less than the mass of two isolated protons and two isolated neutrons. When the component hadrons are assembled, this mass is lost as energy ($E=mc^2$). This makes it ...
8
votes
4answers
370 views
What matter in the original atom bomb is converted to energy?
When an atom bomb goes off some matter is converted to energy according to $E = m c^2$.
I'd like to know exactly what matter in the original atom bomb is converted to energy. Is it protons, neutrons, ...
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
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 ...
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 ...
4
votes
1answer
957 views
How to explain $E=mc^2$ mass defect in fission/fusion
What is the nature of nuclear energy? This is closely related to the correct explanation of mass defect.
I did some research of that topic and cannot come to a single comprehensive and consistent ...
3
votes
0answers
63 views
How fission and fusion create energy? [duplicate]
Possible Duplicate:
How to explain $E=mc^2$ mass defect in fission/fusion
In order for energy to be released, mass has to be "lost", because mass is a form of energy.
In my science class, ...
2
votes
2answers
387 views
Why the energy of a marshmallow is so huge?
In this comment in a blog kudzu computes the energy of a marshmallow with mass $M=25 grams$ by using $E=mc^2$:
$E=Mc^2 = 2.247\times 10^{+15} Joules$
I may be wrong but this seems like a huge energy ...
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
2answers
382 views
Einstein's mass-energy relation
Suppose we have 1 kg of wood and 1 kg of uranium and if we need to find out how much energy would each of the substance give, we'd have to use Einstein's mass-energy relation as follows:
In the case ...
10
votes
1answer
572 views
Does the mass of a battery's change when charged/discharged?
... and if so, how much? Is it possible to detect it, or is it beyond any measurement? I'd say there are two possible scenarios (depending on the battery type) and both seem interesting:
The battery ...
0
votes
1answer
53 views
Non-conversion of mass & energy?
This article is certainly an interesting alternative perspective, but is it factual or does it contain fallacies?
http://www.circlon-theory.com/HTML/EmcFallacies.html
Are mass and energy not ...
2
votes
2answers
105 views
How is an ideal mirrored box of photons distinguishable from massive particles?
Suppose you have an ideal mirrored box that contains enough photons as to have a relativistic mass equivalent to the [rest mass + kinetic energy] of an electron. In other words, the two systems have ...
1
vote
2answers
245 views
Why do photons add mass to a black hole?
Why do photons add mass to a black hole?
When photons are taken irreversibly into a black hole does the mass of the BH increase?
2
votes
1answer
147 views
Man on treadmill and energy/mass conservation
Suppose we put a very obese man inside a large air tight isolated room with a treadmill and he runs on the treadmill for 24 hours and at the end of the day he sees his weight has come down (mostly ...
