# All Questions

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### How much energy from underwater explosion can become tsunami?

As the title suggests: what is the energy efficiency of generating gravity waves through an underwater explosion? How do the various parameters (depth of detonation, depth of water, gross energy of ...
30 views

### Utility of Burger's equation in the study of shock waves

Consider the viscous Burger's equation, $$\frac{\partial u}{\partial t}+u \frac{\partial u}{\partial x}-\nu \frac{\partial^{2} u}{\partial x^{2}}=0, \tag{1}$$ with $\nu>0$ the kinematic viscosity....
141 views

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### Energy and pressure relationship for cosmic rays [closed]

How to prove $E = 3P$ for cosmic rays? In other words $\gamma = \tfrac43$ for cosmic rays. Whereas for $\gamma=\tfrac53$ we have $E = \tfrac32 P$. 51 views

### Why not study quantum mechanics rather than waste time on relativity? [closed]

Relativity is a dubious tweak to Newtonian Gravity why study it?
3k views

### Is it correct to say that it is theoretically impossible for perfect rigid bodies to exist?

If perfect rigid bodies were to exist, then consider a scenario in which two rigid bodies of equal masses moving with velocities of equal magnitude but opposite in direction colliding against one ...
10 views

### Static Equilibrium in fluids and calculating pressure in a moving fluid

Can the below figure support a static state? I presume that is what the question wanted but intuitively the fluid in the diagonal would want to go down and raise the level of the right arm. Am I ...
14 views

### How to deduce the Schrödinger equation by assuming a one-dimensional finite potential well? [closed]

I know the deduction of the Schrödinger equation by assuming a one-dimensional infinite potential well but I can't find the one-dimensional finite potential well.
925 views

### Do electrons have inertia?

I don't know quantum mechanics and know a little bit about mechanics and a very little bit about subatomic particles but I am just a curious to know the answer to my question. My question is if '...
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### Angular Momentum about a Point

I am confused by two different definitions of the angular momentum of a particle P about a moving point Q, with point O as the origin of the inertial frame. I learned the first definition from my ...
10 views

### Transformation of density with finite deformations

Initially, there is a infinite continuous medium with a given mass density $\rho(\vec r)$, which is a smooth function that vanishes outside of a sphere of radius R. Then, a deformation of medium is ...
15 views

### How to predict the time domain of pulse from an amplitude mask in frequency domain?

I am studying ultrafast spectroscopy (pump-probe) and I know that ultrashort laser pulses are used for the pump and probe. These pulses often contain multiple frequencies (i.e. polychromatic pulse) ...
27 views

### Most efficient method to evaporate a metal in a vacuum?

If one had a metal block (lets say tantalum) in a vacuum chamber, what would be the most efficient way of evaporating it in regards to the proportion of the input energy directly going into removing ...
1 vote
34 views

### What is the current density of a circular current?

Lets consider a wire loop in the $xy$-plane of radius $R$ which carries a current $I$. I want to find the current density $\vec{j}(x)$ of that configuration expressed with delta functions. Intuitively,...
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### The cavity method of Ising model in infinity dimension and dynamical mean field

In the article "Dynamical mean-field theory of strongly correlated fermion systems and the limit of infinite dimensions" chapter III.A, when discussing the cavity method of Ising model, the ...
85 views

### What would be the value of $c$ where $c$ is the speed of light?

From the equation of $E=mc^2$, where $E$ is the energy, $m$ is the mass and $c$ is the speed of light, so from that we can get $c=\sqrt{Em}$, again from the equation of $\lambda=v/f$, where $\lambda$ ...