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Forum XenForo in inglese. 12 sezioni seguite: Astronomy and Astrophysics, Atomic and Condensed Matter, Beyond the Standard Model, Classical Physics, Cosmology, Nuclear and Particle Physics, Mechanics, Optics, Other Physics Topics, Quantum Interpretations, Quantum Physics e Special and General Relativity.

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Water spraying into a moving container - momentum equation derivation

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \... Read more

Problem in understanding how upwards acceleration works

Hello, PF! As is known, if body stays on the ground then body is accelerated upwards by the ground. For example, free-falling observer see that body on the ground move to him with acceleration ##9.81m/s^2## I have a problem in understanding how it is possible. If the body is being accelerated... Read more

Hello everyone, I am new here

I am just a dyslexic Nuclear and Particle physics student studying in CTU, I want to work deeply into relativity and QG hopefully in the end. I am currently interested in Operating systems(unix-like ones), nuclear physics, anything regarding gravity and philosophy as science without philosophy... Read more

What is the Difference between Maths and Classical Mechanics?

I am guessing this has been posted before if that's the case please inform me. I was wondering the difference between mathematics and physics. What makes them so different yet so similar? Why does the mathematical intuition does not work on physics, or vise-versa. I know physics is less... Read more

Can exact Lorentzian kinematics emerge from Euclidean space?

Can exact Lorentzian kinematics arise from a theory formulated on a four-dimensional Euclidean space without a Wick rotation? Suppose a theory is formulated on a four-dimensional Euclidean space with a positive-definite metric. Assume that: the metric always remains Euclidean; no... Read more

Consistent Histories inability to combine Frameworks

Suppose you have a 2 step Stern Gerlach where you measure spin in the z-direction and then in the the x-direction. I can have two incompatible frameworks for the two time steps. Not sure on the correct notation here. For Framework 1 we have the projectors at ##t_1## ##[z^+]##, ##[z^-]## and... Read more

World's Worst Video

​ @Wrightley ​ 11 months ago If you end up here, you have arrived to The Matrix. @Straaaayyyy ​ 1 month ago This is junkyard of human consciousness @needsometix ​ 7 months ago genuinely more distubring than most... Read more

Very unrelated meanings for two similarly rooted words. "paragraph..."

I become alert to two very similarly spelt, similarly rooted words, but which have drastically different meanings. Paragraph - a way to organize a piece of writing on paper, or whatever precise definition you like Paragraphia - disorder, unintended symbols, syllables, or words are written... Read more

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