All Questions
221
questions
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39
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Nuclear FISSION origin
Neutrons and protons consist of quarks, and when a neutron and a proton are squeezed tightly enough together, the quarks in each begin to interact and cause them to attract one another. The resulting ...
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
views
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 ...
2
votes
3
answers
156
views
What is the effect of a tangential force on a rigid body in terms of kinetic energy? [duplicate]
Let's take into consideration a sphere. We apply a force F tangent to the sphere.
We know that the linear acceleration of that sphere will be equal to F/m where m is the total mass of the sphere.
Then ...
21
votes
1
answer
4k
views
How much of Earth's mass is created by the energy of the core?
I've read that higher energy means higher mass, and in atomic systems, the kinetic energy and potential energy actually contributes more mass than the actual particles themselves (or so I've read). So,...
- 365
1
vote
1
answer
126
views
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
13
votes
11
answers
4k
views
True or False: energy is conserved in all collisions [closed]
Using introductory physics, how would you answer this question? (I have a disagreement with my instructor and I’m curious to hear your input)
One of us says true because the question doesn’t specify “...
- 139
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 ...
0
votes
2
answers
136
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Energy conversion of electrons in cathode rays
From the principle of conservation of energy, for each electron:
Electrical potential energy = Kinetic energy $$eV = \frac{mv^2}{2}$$ $$v = \sqrt\frac{2eV}{m}$$
where e is the charge of an electron, V ...
- 23
0
votes
1
answer
101
views
Energy turns into mass [closed]
I studied on YouTube that when mass is converted into energy, energy is converted into mass somewhere, but when I searched for this theory, I did not find it. Does anyone know what the name of this ...
-1
votes
1
answer
528
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Momentum of massless particles [duplicate]
If $E=pc$ for massless particles, then it should be $p=0$ as $p=mv$ and $m=0$. Why do we use the equation $E=pc$ for massless particles?
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votes
2
answers
84
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Would a set of very massive spinning disks on the lowest points of a ship increase its inertia to ocean waves?
Would a set of very massive spinning disks on the lowest points of a ship increase its inertia to ocean waves? As ships are filled with an enormous mass of balast water which is not enviroment ...
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2
votes
2
answers
186
views
Does a magnet lose mass if it’s doing work?
If a standard refrigerator magnet is used to hold up a piece of paper is it doing “work”? If so it would seem to me that energy would be required for that work and then by extension energy would be ...
- 21
0
votes
2
answers
69
views
Does an object with kinetic energy have increased mass? If so, how is this reconciled in relativity?
Let's imagine that you are standing in a field. You have a ball that weighs 10 grams. You throw this ball at 40 kph. If I understand things correctly, this ball now has kinetic energy relative to your ...
- 357
1
vote
1
answer
2k
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How much vertical weight/height do I need to store 33 kWh of energy? [closed]
My question is the feasibility of a vertical mechanical weight battery, but unlike previous questions, I wanted to give a precise scenario and see if my math is right (which I doubt)
First, it takes 1....
- 21