# All Questions

134,965 questions
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### Question about expansion of electrostatic potential?

If I take a certain dipole and by dipole I mean that two charges of opposite sign differentiated by very small distance. And if I take the formula of expansion of potential then I see no other term ...
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### Is Einstein's Grandfather's theory is wrong? [on hold]

I claim that Einstein's Grandfather paradox theory is wrong. I find that Einstein told that if one goes to his past and kills his/her grandfather then where his/her existence is? Einstein claims from ...
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### Mathematics of quantum mechanics for beam splitter

I'm reading a book where quantum interference is explained with a common experiment, where photons are thrown to some apparatus formed by two beam splitters: Describing the problem using linear ...
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### Alternative paradigm for the universe indistinguishable from current paradigm ? Why so?

How can a universe with fixed size and a speed of light inversely proportional to time since creation be differentiated from the current expanding universe paradigm? The speed being infinite a T=0 is ...
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### Complex conjugated representation and its Young tableaux

This post is an exact copy of one that I posted in Math's site. I do this copy because people there suggested me to do it since, apparentely, in Mathematics and Physics we use different conventions ...
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### Gravitation and escape speed

I applied conservation of energy at the surface and at the centre of earth which brought me too equation ''- GMm/R =1/2 m v^2 '' having asked my sir he said that gravitational potential energy at the ...
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### How can an electric field between two parallel plates be constant

How can electric field in general and more specifically between two parallel plates be constant, if E depends on distance, how can the electric field be constant. The equation deltaV=Ed, should E not ...
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### Infinitesimal parameter of Lorentz transformation

I'm working through the SUSY lecture notes by Lambert, and he does something which seems strange to me during the calculation of the Wess Zumino model. He says the spinor $\psi$ has the ...
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### Speed of the weight? [on hold]

a) If the 20-kg cylinder is released from rest at h = 0, determine the required stiffness k of each spring so that its motion is arrested or stops when h = 0.5 m. Each spring has an unstretched length ...
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### How to proof that invisiable metter is not simply function from (visiable mass, time) pair?

How to proof that invisiable metter (Dark Matter, Dark Energy) is not simply function from (visiable metter, universe age) pair in terms of known laws of phisics?
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### Diffraction due to thin wire [on hold]

Here's what I did: The wire ends can be taken as two slits So $$θ=λ/d$$ $$2θ=λ/d$$ So we have $$s=r2θ$$ The relationship between x and s is $$(x/s)=sin(2θ/2)$$ r, θ and (a+b) are a part of the ...
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### Confusion of the Isobraic Process Heat equation

I was currently reading a wiki article on Isobaric Process (Link at bottom f post). And am confused as to why in there derivation of heat of a an isobaric system they use specific heat capacity for ...
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### How would the bubbles behave if

If the whole universe was filled with water and there was only 2 bubbles present would they attract or repel. I guess they would attract because of surface tension but I am not totally sure why and ...
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### Why electric field inside a cavity of a non-conducting sphere not zero?

Now consider a charged non conducting sphere of uniform charge density, and it as hole of some radius at the centre, now suppose I apply gauss law as there is no charge inside the cavity: so no ...
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### What does the interferogram in Michelson interferometer mean about the topology of the specimen?

I'm want to know how can I evaluate the surface of a fibre by using the interferometer of Michelson. The object beam in this method is reflected from the object and combined with the reference beam to ...