PeroK's latest activity
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PeroK replied to the thread Coulomb's force vs the Lorentz force.From what I've seen, there are a lot of bad questions out there now. And a lot of wrong explanations. The common theme seems to be... -
This is the exact question. This question probably was prompted to around a million students two years back. Anyways, with reference to...
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Beams of electrons and protons move parallel to each other in the same direction. They ______. a. attract each other. b. repel each...
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PeroK replied to the thread Coulomb's force vs the Lorentz force.Trivially, if the speeds are ##u > v##, then (in the non-relativistic approximation), there is a frame where the speeds are ##\frac{u -...
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PeroK reacted to Pikkugnome's post in the thread Undergrad A variant of the Monty Hall problem with
Like.
There is a nice little variation of the problem. The host says, after you have chosen the door, that you can change your guess, but to... -
To muddy the waters some more, here is one of the many sites that feature this question...
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PeroK replied to the thread Coulomb's force vs the Lorentz force.If they move with the same velocity in the "lab" frame, then the frame in which they move with the same velocity in opposite directions...
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PeroK replied to the thread Coulomb's force vs the Lorentz force.This question can be understood without relativity by considering a reference frame in which the beams move at the same speed in...
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PeroK replied to the thread Coulomb's force vs the Lorentz force.Speed is frame dependent. Take the case where the speeds are equal and consider the frame where that speed is zero. Now we have two...
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PeroK replied to the thread Coulomb's force vs the Lorentz force.What happens if the speed of both beams is zero, or approximately zero?
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PeroK replied to the thread Enthusiastic Physics Learner.There are also bona fide undergraduate lectures online. MIT, for example, has a whole range - and not just physics and maths.
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I am retired with a scientific background in Mathematics and Physics though I quit Academia after graduation. Recently, my interest has...
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PeroK reacted to Demystifier's post in the thread Undergrad The Universe is No Simulation with Like.
The paper is silly, to put it mildly. The crux of their argument is that the set of axioms is arithmetically expressive and therefore...
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PeroK reacted to mitchell porter's post in the thread Undergrad The Universe is No Simulation with Like.
I do not see anything in their argument that actually relies on the topic being quantum gravity. They could have written a paper...
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PeroK reacted to DaveC426913's post in the thread Undergrad Please Explain (actually explain) The Monty Hall Problem with Like.
Yup. That's exactly what happened to me. The process of writing the program forces you to untangle and define the logic. By the time I...