All Questions

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What happens when two balls collide?

What happens when ball traveling at constant speed hit resting ball with same mass more mass less mass (ie. how diagram of balls speeds looks like) Balls are made of same material and they ...
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How to tell whether a wave is coherent or not?

I know that coherency means constant phase difference,but how to figure it from equation? Are all sinusoidal waves coherent?
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Quality factor of an LCR circuit

The quality factor of an LCR circuit is defined as: $$\omega°/2\delta\omega$$ $\omega°$ stands for the resonant frequency, and $\delta\omega$ for the range of frequencies between half power point and ...
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LIGO discovery: what in the paradigm hierarchy is that that is not wibbling?

Regarding the wonderful 2016 news about gravity waves. Something that confuses me is that: the gravity wave burst from the black hole event wibbled spacetime "itself". Again, my understanding of a ...
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what is the meaning of infinite mass?

IF a particle/object is moving at speed of light (v=c), using relativistic mass equation we get 0 in denominator i.e. m = infinite. So what is the meaning of that? At v= 0.99c as per the arithmetic ...
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Transformers: relation between their current, voltage and resistance

My current understanding Transformers are used to step up and down voltage keeping power constant. Hence, for example, if I step up some voltage, the current will decrease in the secondary circuit. ...
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Velocity selector and charge to mass ratio of an electron

I recently read that J.J. Thompson used a velocity selector to find the charge to mass ratio of an electron. Having learnt the principle behind the velocity selector, I see no relation between these ...
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induction of voltage from power lines to telephone lines

A pair of isolated parallel power lines of 1 cm radius with a separation of 90 cm have a voltage difference of 440 V. These power lines are 60 cm above a pair of telephone lines. The telephone lines ...
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Could discovered gravitational waves in fact be an aether wind?

Proving the existence of gravitational waves might revolutionise cosmology, but the method used by LIGO is quite similar to the famous Michelson-Morely interferometer built more than a hundred years ...
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Producing negative energy/exotic matter with particle accelerator for warp drive

Is it possible to make exotic matter or negative energy in particle accelerator for warp drive and for wormhole? If not what are the possibilities for creating negative energy.
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Could LIGO discovery be due to e.g. earthquakes or have a terrestrial source?

I mean, could it have been earthquakes or anything else?
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resource recommendation for understanding moment of inertia

I'm a student majoring in mathematics and have to study mechanics this semester .I had problem in understanding concept of moment of inertia. So is there some nice place from where I can understand ...
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How does wavelength affect scattering of light rays?

I am asking how wavelengths affect scattering(not diffraction). We know lesser the wavelength, greater is the scattering. For example, violet ray(wavelength 0.4 micron) is scattered most and red ...
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Does the speed of light change?

I know that there is a similar questions, but I think mine is a bit different. I wonder if with the expansion of the universe the speed of light changes. It seems that the speed of light is very ...
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Magnetic field lines opposite to actual direction

I was reading about purely inductive AC circuits. This is how the book tries to explain what happens in each cycle. As it can be seen, in the first and the fourth scenarios ,some magnetic field ...
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What happens to a a body if it rotates extremely fast?

I am thinking on a object, e.g. ball or planet that starts rotating with increasing speed. Let's assume that his speed get's closer to the speed of light, what happens to this object? There are ...
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How is water falling from a tap an example of the conservation of mass?

In a book, Conceptual Physics by Benjamin Corral, it was given that when water falls down from a tap, it is a case of conservation of mass. They said that this is because water is thick when just ...
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How can I improve google ranking for my gaming site

http://feverofgames.com/ This is my site. I am facing difficulties to improve google ranking.
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question on position in relation to source

Imagine a scenario where there is a source point and an emergent position of observation. The emergent position originates at the source. The distance between the source and the point of observation ...
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Why quantum field theory is never used in engineering?

I love physics, but I really don't like engineering! Reasons: Physics has a lot more mathematical stuff; mathematical stuff is the most interesting Physics is a lot more general than engineering I ...
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How do gravitational waves and black holes interact?

Following the first detection of gravitational waves yesterday (11 Feb. 2016) by LIGO, I have a couple of questions about how gravitational waves and black holes interact. Assume that there is a ...
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Is it possible that there are still gravitational waves of the big bang?

We already discovered the cosmic background radiation what are the 'leftovers' of electromagnetic radiation of the big bang. Probably gravitational waves of the big bang (if they exists) would be to ...
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Superconductive contour

We have a superconductive contour in the shape of circle with radius $a$ . Inductance of contour is $L$, when the contour is out of magnetic field, there's no current in it. What's the current in the ...
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What happens to the radius of a sphere if I double the number of atoms contained in it?

I'll get a lot of downvotes eventually, but I've been trying to answer this questions for months. Scenario: Say I have a sphere containing helium. I've always wondered what would happen if I double ...
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Bondi mass aspect

I'm looking for a good reference that defines the Bondi mass aspect and his relations to Bondi and ADM mass. Googling a bit I've not founded any satisfactory exposition of the subject. A short ...
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Compton Scattering problem verification

A photon emergre in an angle $\theta=\frac{\pi}{4}$ in a Compton scattering the kinetic energy of the photon is $K_i=2K_f$. I must find $K_i$ in $MeV$. $\lambda_f -\lambda_i= \lambda_c$. Then: ...
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Wavefunction overlap in graphene

In calculation of the response functions of graphene we need to calculate the 4-point correlation function of the form : $$\langle T \rho(q,\tau)\rho(-q,0)\rangle$$ The article I'm reading states ...
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If I push or hit an object in space will it rotate or move along a straight line?

If I push or hit an object in space (vacuum and no gravitation) in direction what is not going trough its centroid, will it rotate or move along in straight line? I expect that on earth it will ...
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Confusion in a problem

This is a very basic homework type question. I guess there is some intermixing of concepts in my head. Help. There was a question I came across - A ball of mass 0.2 kg is thrown vertically upwards ...
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Generating electricity

Why is it when we talk about generating electricity we only try predominately using only one type, eg. Solar, fossil.etc. Why do we not use them in series to ensure a greener generation of power? ...
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Intuitive picture for spin-fluctuations contribution to sign reversal of S+- state

In conventional superconductor, electron-phonon interactions lead to negative paring potential and further s-wave superconducting gap. One mechanism for superconductivity in iron-based ...
If a coil has $L$ henry self-inductance, resistance of $R$ ohms and potential deferens of $V$ volts what will be the current through it? In my opinion this case should be considered as resistance and ...