# All Questions

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### Calulate the eigenvalues and the possible states after measurement [closed]

An observable is given by $$\sum\limits_{n= 1}^N a_n|a_n\rangle\langle a_n |$$ Here $\langle a_n |a_m\rangle = \delta_{nm}$. What are the possible measurement results corresponding to the operator A ...
319 views

### Intuitively why time period of shm do not depend on displacement from mean position, ie. amplitude [duplicate]

Why simple harmonic motion time period equation is independent from displacement from mean position?
73 views

### Estimate Calories Burned from Arbitrary Limb Movement

I'm looking to create a model using a reasonable physics-based approach to estimate calories burned for arbitrary movement. To keep the scope fairly limited and tractable, I am looking at the ...
1k views

364 views

### Why this is not a perpetuum mobile [duplicate]

If we imagine a device like one shown on the picture above, why can't we say that it would work? Here is a cylinder somehow placed in the fluid by one of his sides (one in the box). Due to additional ...
336 views

### What are the Electric and Magnetic Properties of Aluminum Oxynitride?

Is Transparent Aluminum (Aluminum Oxynitride) a good conductor of electricity? Also, is it attracted by a magnet?
125 views

### Understanding entropy production

I found this concept of entropy production in wikipedia. Mainly I am trying to figure out the formula the Clausius formula for entropy production. What exactly are the terms involved? For what ...
59 views

### Generating very large area gamma rays by other ways other than large accelerators

According to this link https://apps.dtic.mil/dtic/tr/fulltext/u2/a351472.pdf, HERMES III at Sandia National Labs can generate very large area gamma rays by converting the electron beam into ...
116 views

### Wave function collapse and a general wave function

Action of an operator on a state vector collapses the wave function to any of the eigenstate of that operator , So we get resulting state of the system as some base ket. But mathematically action of ...
261 views

### Can we generate electric current by injecting electrons into a copper panel

Suppose I take a vacuum tube and accelerate electrons in it by electric fields then collide it on a copper plate. Will the electrons then go inside it and generate an electric current by putting a ...
6k views

### What does grounding a plate mean happens to the charge?

In the context of image charges. Let say I have a very large grounded/earthed plate. If initially the total charge on the plate is 0 then we place a positive point charge, $Q$ just above its surface (...