All Questions
Tagged with potential-energy energy
69
questions
2
votes
2
answers
672
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Change in gravitational potential energy when the work is zero
I may be misunderstanding the whole concept , but my doubt is this.
Let us say there is an isolated system comprising of a rock and the Earth. If I was to lift the rock up with a force equal to the ...
- 71
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1
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Relation of potential energy and total energy in Bohr Model of the hydrogen atom
I am currently in the 11th grade. In the Bohr Model of the hydrogen atom, potential energy is two times that of total energy. It means that magnitude of potential energy is two times that of magnitude ...
- 135
2
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1
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364
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Positions and corresponding terminology of "acoustics energy"?
From limited knowledge, decades ago, dating back to the nineteenth century:
Ohm's law of specific acoustic energies was the first biological application of Fourier's theorem.
Actually, it was ...
- 131
2
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4
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What has the potential energy: the spring or the body on the spring?
Particles have gravitational potential energy due to its position in the gravitational field. We say the particle has potential energy and not the Earth (the body doing the work). Why is it not the ...
- 149
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3
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278
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Energy doesn't get lost? Basic understanding, please [duplicate]
If its true that energy isn't lost, its just transferred, where did the energy go from a falling object that hits the floor and stays there?
It started with the most gravitational potential energy, a ...
- 117
1
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2
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603
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Potential and Kinetic Energy
In engineering school you learn the basic swing problem. Essentially that there is a transfer of kinetic energy (as seen in the velocity at the bottom of as swing) to potential energy at the top of ...
- 11
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0
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98
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How to find energy for bounded orbit?
I have a time-independent Hamiltonian which describes a system. How do I find the energy threshold where the orbit stops being bounded? That is when there does not exists no zero-velocity surface?
- 35
1
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1
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Electrostatic stored energy of a continuous charge distribution
If I have a charge distribution A at infinity and and another charge distribution at origin, say B, then the energy stored in the system when I bring the charge distribution A from infinity to a ...
- 453
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1
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1k
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What's the meaning of potential energy in quantum physics?
We know that the definition of potential energy in classic physics. When we start learning about quantum physics and especially the Schrodinger equation we blindly accept the potential energy part. I ...
- 35
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2
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345
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Could someone remind me what this means again? $\nabla U = \pm F$
You know that for a potential function (conservative force/fields) that
$\nabla U = \pm \vec{F}$
In math, we don't have that minus sign, we have only the plus one.
What does it mean if you get rid ...
- 937
1
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3
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693
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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 ...
- 481
1
vote
1
answer
81
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Mass-Energy equivalence in case of minimal coupling
The energy-momentum relation of a free particle is (in SI Units):
$$
m^2c^4 =- c^2 \vec{p}^2 + E^2
$$
Minimal coupling is a way to fix a gauge freedom for the choice of canonical momentum (which I ...
- 6,763
1
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1
answer
370
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What is the cause of the large damage by atomic bomb?
I recently read in the Feynman Lectures that when the nuclei like that of uranium which are at the crucial level of balance between strong nuclear forces and electrical repulsive forces are taped ...
user87745
1
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3
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Why is there a 1/2 in the expression for electrostatic energy U?
The expression for electrostatic energy is $$U= \dfrac{1}{2} \times \int \rho\,\phi\, dV$$ where $\rho$ is the charge density and $\phi$ is the potential at that point in ($dV$)
Let me explain what I ...
- 455
0
votes
2
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113
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Paradox? Why does energy conservation appear to be violated in this simple geared system?
While answering a question about gears and levers, I found I could not get the work in to equal the work out in this simple gear system illustrated below:
The gears are set up to replicate a lever, ...
- 6,102