# All Questions

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### two bodies are travelling with equal acceleration

two bodies are travelling with equal acceleration in the same direction and are in contact with each other. What will the force exerted by 1st body on second be? By taking an example of masses 5 and ...
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### Mathematical Definition of Locality

What is the mathematically precise definition of principle of locality in physics for a continuous space-time in the sense that an object is only directly influenced by its immediate surroundings ?
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### Does Matter matters when calculating Optical Period?

If I consider the optical period $T$ of a given wavelength $\lambda$ in vacuum, I can calculate it by: $$T = \frac{1}{f} = \frac{\lambda}{c}$$ However, in a particular material, I am not quite sure ...
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### Using Coulomb's law to solve for a continuous charge distribution

I have been trying to evaluate this specific integral and have been completely stuck. $\frac{1}{4\pi \epsilon_0} \int^L_0 \frac{2\lambda z}{(x^2+z^2)^\frac{3}{2}}dx$ I am a freshman and have been ...
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### screening in semiconductor

how can we get the following solution for the screened potential of a point charge Q: by using the following thomas-fermi equation as: where:
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### The Baryonic Tully-Fisher relation

I have recently completed deriving the Baryonic-Tully Fischer relation using a new model of Quantum Gravity which has already been published in a respected peer reviewed journal specializing in all ...
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### What is the $g^2(0)$ value of squeezed light?

$g^2(0)$ value of coherent light $= 1$ $g^2(0)$ value of chaotic/classical light $>1$ $g^2(0)$ value of quantum light $<1$ $g^2(0)$ is the second-order correlation function given by ...
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### Is There A 'Leading Edge,' To the Universe?

Is there a center to the universe? Did the Big Bang happen at a single location, spreading outwards? Or, was the Big Bang more of a state-change, in which the universe went from super-dense and ...
2answers
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### Get angle to hit (x,y) with vertex

In a projectile trajectory, I'm using the following equation to get the angle required to hit a target in x,y coordinates: This works great, however, it implies that the target is reached by one of ...
2answers
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### the sound of rotating helicopter blades

Why do helicopter blades make this pulsing, oscilating, slapping(?) sound? Since their movement is smooth, shouldn't the sound be a similar, constant shush, perhaps increasing or decreasing in ...
2answers
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### If the universe is spatially infinite, and if something (A) is possible, does that mean the thing (A) happens?

Assuming that the universe is spatially infinite, extending outwards in all directions without end, and is consistent with what we have thus far observed, and predict to find (and predict to be out ...
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### Optics simulation software for iypt #12 question thick lens

(As I'm writing these I viewed previous posts about optics simulation) me and some of my friends are working in iypt problems. one of the problem is named "thick lens" which says: A bottle filled ...
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### Work energy and laws of motion and friction problem?

I am having a confusion in the following question- Q-To stimulate car accidents auto manufacturers study the collision of moving cars with mounted springs of different spring constants. consider a ...
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### Influence of applied voltage to an electron of a metal

I would like to ask what would happen to the potential well of an electron being trapped in a metal? If I apply a voltage trying to accelerate the electron out of the potential well. Would It make the ...
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### Rotational Speeds

I was driving the other day and couldn't help but look at all the wind mills in the wind farms. I know I am not doing the math correctly, but I want to know what is "really" happening when a windmill ...

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