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Physics : Recent Questions and Answers (Page 616)

Find answers to your questions about Physics or help others by answering their Physics questions.

Chern-Simons, holography, and bibliography

I am looking for review papers / online talks on Chern-Simons theory with particular focus on the gravitational dual description within the AdS/CFT framework....

Asked on 01/27/2021

0 answer

How exactly did lowering of the graphite parts of the control rods on Chernobyl's RBMK reactor result in reactivity surge?

There are many sources giving different data on the initial position and the dimensions of the rods, but most suggest that the absorber was located just outside the core when...

Asked on 01/27/2021

1 answer

What happens when two objects gets separated by the cosmic horizon?

More importantly, what happens to the energy/information? In most respects this should be the same as a black hole horizon? Only even more weird, because here two masses gets "disconnected"...

Asked on 01/27/2021 by Henry Lindhen

1 answer

Why is there a negative sign in the (non-relativistic) bivector formulation of the Lorentz force?

I'm currently trying to update my understanding of basic (Newtonian, non-relativistic) physics to use bivectors and Clifford products instead of pseudovectors and cross products. And I've come up against that...

Asked on 01/27/2021

1 answer

Why Doesn't Thermal Radiation Render Thermionic Conversion Unable To Approach Carnot Efficiency?

Thermionic Conversion follows the classic Richardson-Dushmann Equation for thermionic current as a function of temperature squared: $$J_{RD} = A_0 T^2 expleft(-frac{phi}{k_B T}right)$$where$J_{RD}$ is the...

Asked on 01/27/2021

1 answer

Atom emits photon when electron changes energy levels -- is this related to moving charge emitting e/m radiation?

Not much more than what I asked in the title. I think it is true that a moving charge emits photons also....

Asked on 01/27/2021

1 answer

Ball on a string

A ball is attached to a string on a pole (i.e. Totem Tennis). If you hit the ball harder tangentially and horizontally, what will happen to the centripetal force, velocity...

Asked on 01/27/2021 by latin333

1 answer

Can the heating of the spring in oscillator be modeled by a velocity dependent force?

In a damped oscillator, the damping term is represented by a velocity dependent force $b dot{x}$. This makes sense if the damping is due to viscosity of the...

Asked on 01/27/2021 by Chegon

2 answer

Do tensor equations hold with all indices up or down?

I am starting with general relativity and the notation is making me suffer. If we have, for example, the tensorial equation:begin{equation}A^{munu} = K^{munu}end{equation}Where $A$...

Asked on 01/27/2021 by NambuGotto

0 answer

Interpretation of Free Damped Vibrations

I'm studying vibrations; so I'm using Beer-Johnston-Cornwell Dynamics book. I am worry about the equation for Underdamped Vibration, which in the book it is: $$x_{(t)}=x_0e^{-lambda t}sin(omega_d+phi)$$ where $$omega_d=sqrt{omega_n^2+c^2/4m^2}$$...

Asked on 01/27/2021 by Isai

1 answer

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