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1d
comment How to calculate the linear speed without angular velocity?
In this case, the central force can also be obtained from the tension. See part d.
1d
comment How to calculate the linear speed without angular velocity?
You can calcuate the angular velocity from the central force.
1d
comment What is a Fermi arc?
The Fermi surface of a 2D system is typically a closed contour that encloses a region in momentum space. However, in some cases, the contour is not closed. Such a Fermi surface is known as a Fermi arc. See DOI:10.1126/science.1248783 for some experimental results about Fermi arcs in the cuprates.
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May
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comment Two solutions, A+ and A-, for masses connected via springs
Basically, we want to find $A_j$ as a function of $j$. It turns out that both $A_j=A_+ e^{i\theta j}$ and $A_j=A_- e^{-i\theta j}$ work, for some $A_+$, $A_-$, and $\theta$ independent of $j$. You should be able to find $\theta$ in terms of $\omega$ and $\omega_0$.
May
3
comment Graph of energy stored in capacitor?
Let us continue this discussion in chat.
May
3
comment Graph of energy stored in capacitor?
Try starting with $Q=Q_0-It$, where $Q_0$ is the initial charge the capacitor has.
May
3
comment Graph of energy stored in capacitor?
Alternatively, you can write up your own answer, and show us how you can get correct graph.
May
3
comment Graph of energy stored in capacitor?
The equation $Q=It$ is incorrect, since $Q$ should be nonzero when $t=0$.
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7
comment Does changing the electric / magnetic field cause self-reinforcing induction of the other?
@LandosAdam In this situation, you can think of the fields repeatedly producing each other. But ultimately, the total electric fields and the total magnetic fields have to satisfy Maxwell's equations.
Apr
4
revised Precisely speaking, does photon become massive or the phonon become massive, due to Higgs mechanism in superconductor?
grammer, typo
Apr
4
suggested approved edit on Precisely speaking, does photon become massive or the phonon become massive, due to Higgs mechanism in superconductor?
Apr
4
comment Does changing the electric / magnetic field cause self-reinforcing induction of the other?
@LandosAdam I find it confusing to think about electric and magnetic fields producing each other. What we know about these fields is encapsulated in Maxwell's equations. These equations do not talk about one producing the other, or one changing in response to the other. The equations only say that whenever the magnetic field is changing, so is the electric field, and vice versa.
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28
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